Short Answer

Determining dev/test set size in the era of big-data machine learning

Question: According to Andrew Ng, what happens to the fraction versus the absolute number of examples in dev/test sets as machine learning datasets grow into big-data scales (such as billions of examples)?

Sample answer: As datasets grow into big-data scales, the fraction of data allocated to dev/test sets shrinks, while the absolute number of examples in those sets continues to grow.

Key points:

  • The fraction of data allocated to dev/test sets shrinks.
  • The absolute number of examples in dev/test sets grows.

Rubric: The answer must state that the fraction of data allocated to dev/test sets shrinks and the absolute number of examples in those sets grows.

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Updated 2026-05-26

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