Stop Data Leakage Before It Starts
Keeping test info out of training.
The Silent Cheater
Data leakage is when test information sneaks into training. Scores look amazing, then collapse in the real world.
Why It Fools You
Leakage lets the model peek at answers it should not see. The test score becomes a fantasy, not a forecast of future performance.
All lessons in this course
- Why You Hold Out a Test Set
- train_test_split Done Right
- K-Fold Cross-Validation
- Stop Data Leakage Before It Starts