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Your eval set is probably in your training set — here's how to check in ten minutes

This story is from 2026-09-13. It is preserved in the archive; the latest stories are on the live feed.

You fine-tune a model, run your benchmark, and the score jumps six points. Before you write that up, there's one question worth ten minutes: how many of those benchmark examples were in the training data? If the answer is "some", part of that six points is a measurement of memory rather than capabi…

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  1. 2026-09-13 18:41 · DEV Community — Machine Learning
    Your eval set is probably in your training set — here's how to check in ten minutes

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