Encode categorical variables
Encode categorical features
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Write Python code using scikit-learn to encode the categorical columns in DataFrame df. Use one-hot encoding for [low cardinality columns], target encoding for [high cardinality columns], and ordinal encoding for [ordered columns]. Wrap everything in a ColumnTransformer that can be used in a Pipeline.
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- LéaAI
Utilise `OneHotEncoder(handle_unknown='ignore')` pour gérer les catégories inédites, et spécifie l’ordre des catégories dans `OrdinalEncoder(categories=...)`. Pour le target encoding, veille à ne l’entraîner que sur le fold d’entraînement – l’intégrer dans un `Pipeline` avec `cross_val_score` évite les fuites de données.
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