Bootstrap Variance Analysis MethodologyΒΆ

This notebook provides a comprehensive analysis of stable-cart methods using bootstrap variance measurement. We compare multiple stable tree implementations against a standard CART baseline to understand their stability and accuracy trade-offs.

Why Stability MattersΒΆ

Standard decision trees are notoriously unstable - small changes in training data can lead to completely different trees and predictions. Stable-CART methods modify the tree-building process to create trees that are more consistent across different training runs, which is crucial for:

  • Model reliability in production

  • Interpretability and trust

  • Reduced overfitting to specific training samples

[1]:

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns
from sklearn.datasets import load_digits
from sklearn.model_selection import train_test_split
from sklearn.metrics import accuracy_score, balanced_accuracy_score, roc_auc_score
from sklearn.tree import DecisionTreeClassifier
from sklearn.preprocessing import StandardScaler

from stable_cart import LessGreedyHybridTree, BootstrapVariancePenalizedTree, RobustPrefixHonestTree

plt.style.use('seaborn-v0_8')
np.random.seed(42)

print("🎯 Stable-CART Advanced Stability Analysis")
print("Comprehensive comparison of stability methods")

🎯 Stable-CART Advanced Stability Analysis
Comprehensive comparison of stability methods

Dataset: Digits Binary ClassificationΒΆ

We use the digits dataset with binary classification (digit 0 vs all others) because:

  • High dimensionality (64 features) where stability effects can be measured

  • Real-world data with natural complexity

  • Clear class separation allowing measurement of stability trade-offs

[2]:

# Load and prepare data
data = load_digits()
X, y = data.data, (data.target == 0).astype(int)

# Standardize features for stable-cart methods
scaler = StandardScaler()
X = scaler.fit_transform(X)

X_train, X_test, y_train, y_test = train_test_split(
    X, y, test_size=0.3, random_state=42, stratify=y
)

print(f"Dataset characteristics:")
print(f"  Features: {X.shape[1]}")
print(f"  Training samples: {X_train.shape[0]}")
print(f"  Test samples: {X_test.shape[0]}")
print(f"  Class distribution: {dict(zip(*np.unique(y_test, return_counts=True)))}")
print(f"  Task: Binary classification (digit 0 vs others)")

Dataset characteristics:
  Features: 64
  Training samples: 1257
  Test samples: 540
  Class distribution: {np.int64(0): np.int64(487), np.int64(1): np.int64(53)}
  Task: Binary classification (digit 0 vs others)

Stability Measurement MethodologyΒΆ

We measure prediction stability using bootstrap variance:

  1. Train the same model on multiple bootstrap samples of the training data

  2. Make predictions on the same test set with each trained model

  3. Calculate the variance of predictions for each test point

  4. Lower variance = more stable predictions across training runs

This simulates the real-world scenario where slight differences in training data (new samples, missing values, etc.) can lead to different model behavior.

[3]:

def measure_prediction_stability(model_class, X_train, y_train, X_test, y_test, model_params, n_bootstrap=25):
    """
    Measure prediction stability via bootstrap variance.

    Returns:
        dict with variance statistics and performance metrics
    """
    n_test = X_test.shape[0]
    predictions = np.zeros((n_bootstrap, n_test))
    aucs = []

    for i in range(n_bootstrap):
        # Bootstrap sample
        n_samples = X_train.shape[0]
        bootstrap_idx = np.random.choice(n_samples, n_samples, replace=True)
        X_boot = X_train[bootstrap_idx]
        y_boot = y_train[bootstrap_idx]

        # Train model
        params_copy = model_params.copy()
        params_copy.pop('random_state', None)  # Avoid conflicts
        model = model_class(**params_copy, random_state=i)
        model.fit(X_boot, y_boot)

        # Predictions
        y_pred = model.predict(X_test)
        predictions[i] = y_pred

        # Performance
        if hasattr(model, 'predict_proba'):
            y_proba = model.predict_proba(X_test)[:, 1]
            aucs.append(roc_auc_score(y_test, y_proba))

    # Calculate stability metrics
    point_variances = np.var(predictions, axis=0)

    return {
        'mean_variance': np.mean(point_variances),
        'median_variance': np.median(point_variances),
        'max_variance': np.max(point_variances),
        'point_variances': point_variances,
        'predictions': predictions,
        'aucs': aucs,
        'auc_mean': np.mean(aucs),
        'auc_std': np.std(aucs)
    }

print("βœ… Stability measurement function ready")
print("πŸ“Š Will use 25 bootstrap samples per model for robust statistics")

βœ… Stability measurement function ready
πŸ“Š Will use 25 bootstrap samples per model for robust statistics

Model ConfigurationsΒΆ

We test different stable-cart methods against a standard CART baseline:

  • CART Baseline: Standard decision tree for comparison

  • LessGreedyHybrid: Uses data partitioning for more cautious splitting

  • RobustPrefixHonest: Uses consensus and honest estimation approaches

  • BootstrapVariancePenalized: Alternative bootstrap-based stability approach

These configurations explore different stability mechanisms in the library.

[4]:

# Model configurations for comprehensive comparison
model_configs = {
    'CART_Baseline': {
        'class': DecisionTreeClassifier,
        'params': {
            'max_depth': 10,
            'min_samples_leaf': 1,
            'random_state': 42
        },
        'description': 'Standard decision tree baseline'
    },

    'LessGreedy_Method': {
        'class': LessGreedyHybridTree,
        'params': {
            'task': 'classification',
            'max_depth': 12,
            'min_samples_leaf': 2,
            'split_frac': 0.95,     # 95% data for splitting
            'val_frac': 0.03,       # 3% for validation
            'est_frac': 0.02,       # 2% for estimation
            'enable_oblique_splits': False,
            'enable_lookahead': False,
            'random_state': 42
        },
        'description': 'Less greedy approach with data partitioning'
    },

    'RobustPrefix_Aggressive': {
        'class': RobustPrefixHonestTree,
        'params': {
            'task': 'classification',
            'max_depth': 15,
            'min_samples_leaf': 1,
            'top_levels': 0,         # No robust prefix
            'consensus_samples': 1,   # Minimal consensus
            'val_frac': 0.01,
            'est_frac': 0.01,
            'random_state': 42
        },
        'description': 'Aggressive robust prefix configuration'
    },

    'RobustPrefix_Conservative': {
        'class': RobustPrefixHonestTree,
        'params': {
            'task': 'classification',
            'max_depth': 10,
            'min_samples_leaf': 2,
            'top_levels': 2,          # More robust prefix levels
            'consensus_samples': 3,   # More consensus
            'val_frac': 0.05,
            'est_frac': 0.03,
            'random_state': 42
        },
        'description': 'Conservative robust prefix with consensus'
    }
}

print(f"πŸ“‹ Configured {len(model_configs)} models for comparison:")
for name, config in model_configs.items():
    print(f"   {name}: {config['description']}")

πŸ“‹ Configured 4 models for comparison:
   CART_Baseline: Standard decision tree baseline
   LessGreedy_Method: Less greedy approach with data partitioning
   RobustPrefix_Aggressive: Aggressive robust prefix configuration
   RobustPrefix_Conservative: Conservative robust prefix with consensus

Running the Comprehensive Stability AnalysisΒΆ

We now run the comprehensive stability analysis, measuring both:

  • Single-run performance (accuracy, AUC)

  • Bootstrap stability (variance across training runs)

⏱️ This may take several minutes as we train multiple models with bootstrap sampling

[5]:

print("πŸ”„ Running comprehensive stability analysis...")
print("This trains 25 bootstrap models per configuration")

results = {}

for name, config in model_configs.items():
    print(f"\nπŸ“Š Analyzing {name}...")

    # Single run performance
    model = config['class'](**config['params'])
    model.fit(X_train, y_train)
    y_pred = model.predict(X_test)

    # Get performance metrics
    accuracy = accuracy_score(y_test, y_pred)
    balanced_acc = balanced_accuracy_score(y_test, y_pred)

    if hasattr(model, 'predict_proba'):
        y_proba = model.predict_proba(X_test)[:, 1]
        auc = roc_auc_score(y_test, y_proba)
    else:
        auc = balanced_acc

    unique_preds = len(np.unique(y_pred))

    print(f"   Single run: AUC={auc:.3f}, Accuracy={accuracy:.3f}, Unique predictions={unique_preds}")

    if unique_preds > 1 and balanced_acc > 0.8:  # Working model
        # Measure stability
        print(f"   Measuring stability (25 bootstrap samples)...")
        stability = measure_prediction_stability(
            config['class'], X_train, y_train, X_test, y_test, config['params']
        )

        results[name] = {
            'auc': auc,
            'accuracy': accuracy,
            'balanced_acc': balanced_acc,
            'stability': stability,
            'description': config['description'],
            'working': True
        }

        print(f"   βœ… Variance: {stability['mean_variance']:.4f}, AUC std: Β±{stability['auc_std']:.3f}")
    else:
        print(f"   ❌ Model not working properly")
        results[name] = {
            'working': False,
            'description': config['description']
        }

print(f"\nβœ… Analysis complete! Found {sum(1 for r in results.values() if r.get('working', False))} working models")

πŸ”„ Running comprehensive stability analysis...
This trains 25 bootstrap models per configuration

πŸ“Š Analyzing CART_Baseline...
   Single run: AUC=0.958, Accuracy=0.985, Unique predictions=2
   Measuring stability (25 bootstrap samples)...
   βœ… Variance: 0.0071, AUC std: Β±0.010

πŸ“Š Analyzing LessGreedy_Method...

/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]

   Single run: AUC=0.979, Accuracy=0.983, Unique predictions=2
   Measuring stability (25 bootstrap samples)...

/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 1 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 1 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 1 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 2 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 1 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 1 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/sklearn/model_selection/_split.py:811: UserWarning: The least populated class in y has only 1 members, which is less than n_splits=3.
  warnings.warn(
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3065: RuntimeWarning: invalid value encountered in divide
  c /= stddev[:, None]
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/numpy/lib/_function_base_impl.py:3066: RuntimeWarning: invalid value encountered in divide
  c /= stddev[None, :]

   βœ… Variance: 0.0130, AUC std: Β±0.013

πŸ“Š Analyzing RobustPrefix_Aggressive...
   Single run: AUC=0.990, Accuracy=0.996, Unique predictions=2
   Measuring stability (25 bootstrap samples)...
   βœ… Variance: 0.0062, AUC std: Β±0.012

πŸ“Š Analyzing RobustPrefix_Conservative...
   Single run: AUC=0.968, Accuracy=0.981, Unique predictions=2
   Measuring stability (25 bootstrap samples)...
   βœ… Variance: 0.0066, AUC std: Β±0.010

βœ… Analysis complete! Found 4 working models

Results: Stability vs Accuracy AnalysisΒΆ

Let’s analyze the trade-offs between prediction stability and accuracy performance.

[6]:

# Filter working models
working_results = {name: res for name, res in results.items() if res.get('working', False)}

if len(working_results) < 2:
    print("❌ Need at least 2 working models for comparison")
else:
    print(f"πŸ† STABILITY vs ACCURACY ANALYSIS")
    print("=" * 60)

    # Baseline metrics
    baseline = working_results['CART_Baseline']
    baseline_auc = baseline['auc']
    baseline_variance = baseline['stability']['mean_variance']

    print(f"\nπŸ“Š BASELINE (CART):")
    print(f"   AUC: {baseline_auc:.3f}")
    print(f"   Prediction Variance: {baseline_variance:.4f}")

    # Stable model comparison
    stable_models = {name: res for name, res in working_results.items() if name != 'CART_Baseline'}

    print(f"\nπŸ”„ STABLE-CART MODELS:")

    comparison_data = []

    for name, res in stable_models.items():
        variance = res['stability']['mean_variance']
        auc = res['auc']

        # Calculate improvements
        variance_improvement = (1 - variance / baseline_variance) * 100
        performance_ratio = (auc / baseline_auc) * 100

        comparison_data.append({
            'Model': name.replace('_', ' '),
            'AUC': auc,
            'Variance': variance,
            'Variance_Improvement': variance_improvement,
            'Performance_Ratio': performance_ratio,
            'Description': res['description']
        })

        print(f"\n   {name}:")
        print(f"      AUC: {auc:.3f} ({performance_ratio:.1f}% of baseline)")
        print(f"      Variance: {variance:.4f} ({variance_improvement:+.1f}% vs baseline)")
        print(f"      {res['description']}")

        if variance_improvement > 25:
            print(f"      πŸŽ‰ OUTSTANDING variance reduction!")
        elif variance_improvement > 15:
            print(f"      πŸ† EXCELLENT variance reduction!")
        elif variance_improvement > 5:
            print(f"      βœ… GOOD variance reduction")
        else:
            print(f"      ⚠️ Marginal improvement")

    # Create comparison DataFrame
    df_comparison = pd.DataFrame(comparison_data)
    df_comparison = df_comparison.sort_values('Variance_Improvement', ascending=False)

    print(f"\nπŸ“Š SUMMARY TABLE:")
    print(df_comparison[['Model', 'AUC', 'Variance_Improvement', 'Performance_Ratio']].to_string(index=False, float_format='%.1f'))

πŸ† STABILITY vs ACCURACY ANALYSIS
============================================================

πŸ“Š BASELINE (CART):
   AUC: 0.958
   Prediction Variance: 0.0071

πŸ”„ STABLE-CART MODELS:

   LessGreedy_Method:
      AUC: 0.979 (102.2% of baseline)
      Variance: 0.0130 (-84.0% vs baseline)
      Less greedy approach with data partitioning
      ⚠️ Marginal improvement

   RobustPrefix_Aggressive:
      AUC: 0.990 (103.3% of baseline)
      Variance: 0.0062 (+12.0% vs baseline)
      Aggressive robust prefix configuration
      βœ… GOOD variance reduction

   RobustPrefix_Conservative:
      AUC: 0.968 (101.0% of baseline)
      Variance: 0.0066 (+6.9% vs baseline)
      Conservative robust prefix with consensus
      βœ… GOOD variance reduction

πŸ“Š SUMMARY TABLE:
                    Model  AUC  Variance_Improvement  Performance_Ratio
  RobustPrefix Aggressive  1.0                  12.0              103.3
RobustPrefix Conservative  1.0                   6.9              101.0
        LessGreedy Method  1.0                 -84.0              102.2

Comprehensive VisualizationsΒΆ

[7]:

# Create comprehensive visualizations
if len(working_results) >= 2:
    fig, axes = plt.subplots(2, 2, figsize=(15, 12))

    colors = ['#2E86AB', '#A23B72', '#F18F01', '#C73E1D', '#92AA83']

    # 1. Stability vs Accuracy scatter plot
    ax1 = axes[0, 0]

    for i, (name, res) in enumerate(working_results.items()):
        stability_score = 1 / (1 + res['stability']['mean_variance'])
        auc = res['auc']

        ax1.scatter(stability_score, auc, s=300, color=colors[i % len(colors)],
                   alpha=0.8, edgecolors='black', linewidth=2, label=name.replace('_', ' '))

    ax1.set_xlabel('Stability Score (Higher = More Stable)', fontsize=12)
    ax1.set_ylabel('AUC Score (Higher = Better)', fontsize=12)
    ax1.set_title('Stability vs Accuracy Trade-off', fontsize=14, fontweight='bold')
    ax1.legend(bbox_to_anchor=(1.05, 1), loc='upper left')
    ax1.grid(True, alpha=0.3)

    # 2. Variance comparison bar chart
    ax2 = axes[0, 1]
    names = [name.replace('_', '\n') for name in working_results.keys()]
    variances = [res['stability']['mean_variance'] for res in working_results.values()]

    bars = ax2.bar(range(len(names)), variances, color=colors[:len(names)], alpha=0.8, edgecolor='black')
    ax2.set_ylabel('Prediction Variance (Lower = Better)', fontsize=12)
    ax2.set_title('Model Prediction Variance', fontsize=14, fontweight='bold')
    ax2.set_xticks(range(len(names)))
    ax2.set_xticklabels(names, rotation=45, ha='right')

    # Add values on bars
    for bar, var in zip(bars, variances):
        ax2.text(bar.get_x() + bar.get_width()/2, bar.get_height() + max(variances)*0.01,
                f'{var:.4f}', ha='center', va='bottom', fontsize=10, fontweight='bold')

    # 3. Performance comparison
    ax3 = axes[1, 0]
    aucs = [res['auc'] for res in working_results.values()]

    bars = ax3.bar(range(len(names)), aucs, color=colors[:len(names)], alpha=0.8, edgecolor='black')
    ax3.set_ylabel('AUC Score (Higher = Better)', fontsize=12)
    ax3.set_title('Model Performance Comparison', fontsize=14, fontweight='bold')
    ax3.set_xticks(range(len(names)))
    ax3.set_xticklabels(names, rotation=45, ha='right')
    ax3.set_ylim(min(aucs) * 0.98, max(aucs) * 1.02)

    # Add values on bars
    for bar, auc in zip(bars, aucs):
        ax3.text(bar.get_x() + bar.get_width()/2, bar.get_height() + (max(aucs) - min(aucs))*0.01,
                f'{auc:.3f}', ha='center', va='bottom', fontsize=10, fontweight='bold')

    # 4. Method comparison summary
    ax4 = axes[1, 1]
    ax4.axis('off')

    if len(comparison_data) > 0:
        best_model = max(comparison_data, key=lambda x: x['Variance_Improvement'])

        summary_text = f"πŸ“Š ANALYSIS SUMMARY:\n\n"
        summary_text += f"Best Stability Method:\n"
        summary_text += f"  {best_model['Model']}\n"
        summary_text += f"  Variance change: {best_model['Variance_Improvement']:+.1f}%\n"
        summary_text += f"  AUC: {best_model['AUC']:.3f}\n\n"

        positive_count = sum(1 for x in comparison_data if x['Variance_Improvement'] > 0)

        summary_text += f"Methods with improved stability: {positive_count}/{len(comparison_data)}\n"
        summary_text += f"All methods maintain competitive performance\n\n"

        summary_text += f"πŸ“ Note: Results show actual measured\n"
        summary_text += f"variance changes on this dataset."

        ax4.text(0.05, 0.95, summary_text, transform=ax4.transAxes, fontsize=11,
                verticalalignment='top', fontfamily='monospace',
                bbox=dict(boxstyle="round,pad=0.5", facecolor="lightblue", alpha=0.8))

    plt.suptitle('Stable-CART: Comprehensive Stability vs Accuracy Analysis',
                 fontsize=16, fontweight='bold', y=0.98)
    plt.tight_layout()
    plt.show()

/tmp/ipykernel_2885/1975510725.py:82: UserWarning: Glyph 128202 (\N{BAR CHART}) missing from font(s) DejaVu Sans Mono.
  plt.tight_layout()
/tmp/ipykernel_2885/1975510725.py:82: UserWarning: Glyph 128221 (\N{MEMO}) missing from font(s) DejaVu Sans Mono.
  plt.tight_layout()
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/IPython/core/pylabtools.py:170: UserWarning: Glyph 128202 (\N{BAR CHART}) missing from font(s) DejaVu Sans Mono.
  fig.canvas.print_figure(bytes_io, **kw)
/home/runner/work/stable-cart/stable-cart/.venv/lib/python3.12/site-packages/IPython/core/pylabtools.py:170: UserWarning: Glyph 128221 (\N{MEMO}) missing from font(s) DejaVu Sans Mono.
  fig.canvas.print_figure(bytes_io, **kw)
../_images/notebooks_stability_showcase_13_1.svg

Bootstrap Performance ConsistencyΒΆ

Let’s examine how consistent the performance is across different bootstrap training runs.

[8]:

if len(working_results) >= 2:
    fig, ax = plt.subplots(1, 1, figsize=(12, 6))

    colors = ['blue', 'red', 'green', 'orange', 'purple']

    for i, (name, res) in enumerate(working_results.items()):
        aucs = res['stability']['aucs']
        color = colors[i % len(colors)]

        ax.hist(aucs, bins=15, alpha=0.6, color=color,
               label=f"{name.replace('_', ' ')} (ΞΌ={np.mean(aucs):.3f}, Οƒ={np.std(aucs):.3f})",
               edgecolor='black')

    ax.set_xlabel('AUC Scores Across Bootstrap Runs')
    ax.set_ylabel('Frequency')
    ax.set_title('Performance Consistency Across Bootstrap Training Runs')
    ax.legend()
    ax.grid(True, alpha=0.3)

    plt.tight_layout()
    plt.show()

    # Performance consistency summary
    print(f"\nπŸ“Š PERFORMANCE CONSISTENCY ANALYSIS:")
    print("-" * 50)

    for name, res in working_results.items():
        aucs = res['stability']['aucs']
        print(f"{name}:")
        print(f"  AUC range: [{min(aucs):.3f}, {max(aucs):.3f}]")
        print(f"  AUC std: Β±{np.std(aucs):.3f}")
        print(f"  Coefficient of variation: {np.std(aucs)/np.mean(aucs)*100:.2f}%")
        print()
../_images/notebooks_stability_showcase_15_0.svg 

πŸ“Š PERFORMANCE CONSISTENCY ANALYSIS:
--------------------------------------------------
CART_Baseline:
  AUC range: [0.942, 0.987]
  AUC std: Β±0.010
  Coefficient of variation: 0.98%

LessGreedy_Method:
  AUC range: [0.950, 0.999]
  AUC std: Β±0.013
  Coefficient of variation: 1.30%

RobustPrefix_Aggressive:
  AUC range: [0.948, 0.991]
  AUC std: Β±0.012
  Coefficient of variation: 1.23%

RobustPrefix_Conservative:
  AUC range: [0.943, 0.991]
  AUC std: Β±0.010
  Coefficient of variation: 0.99%