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Why should grouped data such as multiple rows per customer use group-aware splitting?

A Otherwise the same entity appears in both train and validation, causing leakage
B It balances the folds
C It speeds up training
D It is required by cross-validation

Answer

Otherwise the same entity appears in both train and validation, causing leakage

The model memorises the entity rather than learning a generalisable pattern, producing validation scores that do not hold in production.

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