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Your 95% CV score might be fake — I built a framework that fixes the hidden leakage in AutoML

This story is from 2026-08-28. It is preserved in the archive; the latest stories are on the live feed.

Ever shipped a model with 95% CV accuracy, only to watch it crash in production? The culprit: Data leakage in preprocessing. The imputation means and scaling stds were computed on the \\\*entire\\\* dataset before train/test split. Most AutoML tools do this silently. What I built: A lightweight, le…

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  1. 2026-08-28 09:45 · r/learnmachinelearning
    Your 95% CV score might be fake — I built a framework that fixes the hidden leakage in AutoML

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