Data Leakage in Machine Learning: Why a 0.95 Validation AUC Can Collapse to 0.68 in Production
This story is from 2026-09-12. It is preserved in the archive; the latest stories are on the live feed.
I wrote a technical article exploring why a machine learning model can perform extremely well during training and validation but fail after deployment. The article uses a loan-default prediction scenario where the model must predict whether a borrower will default within 90 days. It covers: Tempora…
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- 2026-09-12 12:57 · r/learnmachinelearning
Data Leakage in Machine Learning: Why a 0.95 Validation AUC Can Collapse to 0.68 in Production