Case Study

Setting baselines for an ad recommendation engine

Case context: You are leading a machine learning team building a system to predict which ads to show to individual users. During planning, your team attempts to establish a human-level performance baseline to help estimate the optimal error rate, but human labelers struggle to consistently pick the right ad.

Question: Based on this scenario, what should you conclude about your ability to estimate the optimal error rate?

Sample answer: Because predicting what ad to show a user is a task that even humans have a hard time solving, you should conclude that it will be very hard to estimate the optimal error rate.

Key points:

  • Predicting which ad to show is difficult for humans.
  • Human difficulty removes a strong baseline.
  • Consequently, estimating the optimal error rate will be hard.

Rubric: The response must recognize that human difficulty in this specific task implies that the optimal error rate will be hard to estimate.

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Updated 2026-05-27

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