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Stop Leaking Your Data: Why Your Scikit Learn Accuracy is Fake

This story is from 2026-08-24. It is preserved in the archive; the latest stories are on the live feed.

We review a lot of beginner Machine Learning projects. The most common scenario plays out exactly like this. A junior developer trains their first classification model, evaluates it on their test set, and achieves an incredible ninety nine percent accuracy. They think they have built a masterpiece.…

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  1. 2026-08-24 14:10 · DEV Community — Machine Learning
    Stop Leaking Your Data: Why Your Scikit Learn Accuracy is Fake

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