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Why should preprocessing be fitted inside cross-validation folds?

A Fitting on the full dataset leaks information from the validation data into the transformation
B It is computationally faster
C It reduces memory use
D It is required by scikit-learn

Answer

Fitting on the full dataset leaks information from the validation data into the transformation

Using a Pipeline object handles this automatically and eliminates the error structurally rather than relying on discipline.

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