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Problem 19 - Olympiad
In the context of model evaluation, what is data leakage?
A. Overwriting training data with test data
B. Using information from the future or from the test set during training
C. Storing passwords in plain text
D. Model weights becoming too large
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Correct: B
Data leakage introduces test information into training (e.g., preprocessing on the whole dataset), causing overly optimistic and invalid performance estimates.