Short Answer

Choose the component to improve when most dev-set mistakes come from one stage.

Question: A review of 90 misclassified validation examples shows that 72 errors come from a lane-marking detector and 18 come from a traffic-signal classifier. Which component should you improve first?

Sample answer: Improve the lane-marking detector first, because it accounts for most of the errors.

Key points:

  • The lane-marking detector is the priority.
  • It is responsible for 72 of the 90 errors, far more than the traffic-signal classifier.

Rubric: Full credit for identifying the lane-marking detector as the component to prioritize because it produces the larger share of mistakes.

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Updated 2026-08-12

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