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Choosing Dev and Test Sets to Reflect Future Data

Dev and test sets should be chosen to reflect data one expects to receive in the future and wants to perform well on. The test set should not simply be 30% of the available data when future data is expected to differ from the training data. One should not assume the training distribution is the same as the test distribution; examples should reflect what one ultimately wants to perform well on rather than only the data available for training.

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Updated 2026-05-26

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