Short Answer

Why might a model get 0% training error on only two samples?

Question: Answer in one to three sentences.

Sample answer: With only two training cases, a sufficiently flexible model can simply fit both of them exactly. Because it has effectively memorized those examples, it can reach zero training error.

Key points:

  • The training set is tiny.
  • A flexible learner can memorize the examples.
  • Perfect memorization can lead to 0% training error.

Rubric: The answer should explain that such a small dataset is easy to memorize and that memorization can produce zero training error.

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Updated 2026-08-12

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