Short Answer

Why is defining a new team goal with a replacement metric preferred over manual classifier selection?

Question: When a team's evaluation metric is no longer trusted, why does Andrew Ng recommend picking a new metric to define a new team goal rather than manually selecting classifiers?

Sample answer: Andrew Ng recommends this because proceeding without a trusted metric leads to manually choosing among classifiers, which hinders long-term progress. A new trusted metric explicitly defines a clear, shared goal for the team to work toward efficiently.

Key points:

  • Prevents the team from proceeding too long without a trusted metric.
  • Avoids reverting to manual classifier selection.
  • Explicitly defines a new goal for the team.

Rubric: Answer should state that a new metric defines a clear team goal and avoids the inefficiency of manual classifier selection.

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Updated 2026-05-26

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