Short Answer

Why plot training and validation error together?

Question: What is the main advantage of placing the training error curve and the validation error curve on the same graph instead of inspecting them separately?

Sample answer: It makes it easier and more confident to estimate the validation error trend.

Key points:

  • A shared plot helps project the validation error more reliably.
  • Comparing both curves directly increases confidence in that estimate.

Rubric: The response should explicitly state that plotting them together improves confidence in estimating or projecting the validation error.

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Updated 2026-08-12

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