BUG: cross_val_score fails with scoring='neg_log_loss' when not all labels are predicted · Issue #9144 · scikit-learn/scikit-learn · GitHub
cross validation - Python - cross_val_score on regression problem is not working - 'ValueError: continuous is not supported' - Stack Overflow
python - Cross validation: cross_val_score function from scikit-learn arguments - Stack Overflow
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Cross Validation and Model Selection – Python For Engineers