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Short Answer

How large does a training dev set need to be?

Question: Answer in one to three sentences: What determines an adequate training dev set size?

Sample answer: It only needs to be large enough to evaluate and track the learning algorithm's progress. It is therefore usually smaller than the actual training set.

Key points:

  • Large enough for evaluation
  • Large enough to track learning progress
  • Usually smaller than the actual training set

Rubric: The answer should tie size to evaluation and progress tracking and may note that the set is usually smaller than the training set.

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Updated 2026-07-20

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