Short Answer

Why add a training-error curve?

Question: Answer in one to three sentences: What weakness of looking only at the dev-error curve motivates also plotting training error?

Sample answer: The dev-error curve alone can be hard to project forward, so it does not clearly show what will happen as more data are added. Plotting training error gives another signal that helps estimate how performance changes with additional data.

Key points:

  • Dev error by itself may be difficult to project
  • Training error adds information about the effect of more data

Rubric: The answer should mention that the dev-error curve alone is hard to extrapolate and that training error is added to help estimate the impact of more data.

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Updated 2026-08-12

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