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Which sizing principles should be reused for a training dev set?

Question: Answer in one to three sentences: Which rules should guide the choice of a training dev set's size?

Sample answer: Begin with the same practical rules you would use to size a development set. In general, those rules also transfer to the training dev set, so it should not be treated as a separate case with a wholly different sizing method.

Key points:

  • Reuse the usual development-set sizing rules.
  • They generally transfer to the training dev set.
  • Keep the idea as "most," not "all."

Rubric: The answer should say that the usual development-set sizing rules largely apply to the training dev set, and it should preserve the idea of "most" rather than "all."

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Updated 2026-08-12

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