Leakage Check Battlecards
Recall practical leakage checks for features, preprocessing, and validation splits.
Feature objection "The field is in the warehouse, so the model can use it." A stakeholder defends a high-lift feature. Your line The warehouse is not the test. Would this field exist through the approved pipeline before the decision point? Treating data availability today as evidence of availability at prediction time. The check focuses on timing and deployment path, not whether the field is technically present. Timing test Feature is available now vs. feature is available at prediction time Prediction-time availability is the standard. Preprocessing What is the split-fit-transform rule? Split first. Fit preprocessing on training data only. Transform validation…
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