Short Answer

What is the purpose of asking friends to take photos when constructing a pre-launch dev/test set?

Question: According to Andrew Ng, what is the purpose of asking friends to take mobile-phone pictures of cats when you have not yet launched your mobile app?

Sample answer: The purpose is to try to approximate the future user data distribution for your dev/test sets when actual user data is not yet available.

Key points:

  • Actual user data is unavailable before the mobile app launches.
  • Asking friends for photos serves to approximate the future data distribution.

Rubric: The response must mention that the action serves to approximate future user data for dev/test sets when actual user data is unavailable.

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Updated 2026-05-26

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