Short Answer

How dev and test set sizes change when datasets become very large

Question: When a machine learning project grows to a very large dataset, what happens to the share of examples reserved for dev/test sets, and what happens to the number of examples in those sets?

Sample answer: As the total dataset becomes very large, the share reserved for dev/test sets gets smaller, but the dev/test sets can still contain more examples in absolute terms because the overall dataset is much larger.

Key points:

  • The share reserved for dev/test sets gets smaller.
  • The absolute number of dev/test examples can still increase.

Rubric: The answer must state that the share of data reserved for dev/test sets gets smaller and the absolute number of examples in those sets can still increase.

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Updated 2026-08-12

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