AI GLOSSARY · DATA & ML
Data leakage
When information from the test set or the future sneaks into training, making results look better than they are.
Example
Scaling data using statistics from the whole dataset before splitting.
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Related terms
DATA & MLBaselineA simple reference result that a model must beat to be worth using.DATA & MLOverfittingWhen a model memorises training data and performs poorly on new data.DATA & MLTrain/test splitKeeping some data aside, unseen during training, to measure real performance.DATA & MLClassificationPredicting a category, such as spam or not spam.DATA & MLRegressionPredicting a number, such as a price or a quantity.DATA & MLClusteringGrouping similar items without predefined labels.