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Short Answer

Choosing the Size of a Monitoring Dev Set

Question: Answer in one to three sentences: What determines how many examples a training-development set should contain?

Sample answer: It should be large enough to give a dependable signal about whether the learning system is improving from one run to the next. In practice, it is often kept smaller than the full training set because its job is measurement, not model fitting.

Key points:

  • Enough examples for a dependable evaluation
  • Enough to compare progress across training runs
  • Typically smaller than the training corpus

Rubric: The answer should connect the set size to reliable evaluation of training progress and may note that it is generally smaller than the training set.

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Updated 2026-08-12

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