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Manually checking a modest set of development-set mistakes can quickly point to the main kinds of problems a model is having. For example, a review of about 20 errors may show repeated confusion between two labels, weak performance on rare cases, or inconsistent data. That kind of review gives a rough diagnostic picture, not a complete analysis of every failure mode.

A Small Sample of Dev Errors Can Reveal Major Failure Patterns

What does reviewing about 20 manually inspected development-set errors usually reveal?

Small manual error reviews can reveal big patterns

Reviewing a small sample of mistakes gives a _____ picture of the main error sources.

Match each part of the manual error review statement with its role.

Question:
In a concise analytical response, explain what you can learn—and what you cannot conclude—from manually inspecting about 20 mistakes made by a classifier on reviewed development examples.

Sample answer:
Inspecting about 20 mistakes by hand can help reveal recurring failure patterns and point to the main kinds of errors the model is making. That makes it useful as a first pass for deciding where to investigate further. However, a review this small does not justify precise estimates or a complete explanation of the model’s behavior, so the result should be treated as a rough indication rather than a final diagnosis.

Key points:
- About 20 mistakes reviewed manually
- Development examples
- Identification of recurring error patterns
- Only a rough indication, not a full accounting

Rubric:
A strong response identifies the approximate sample size, the development-set context, the value of spotting major error patterns, and the limitation that the conclusion is only approximate.

What a small manual review can show about model errors

Case context:
A team manually inspects 18 errors made by a text classifier on recent validation examples. The review suggests that a few error categories explain many of the mistakes.

Question:
What conclusion is justified from this review, using only what the evidence supports?

Sample answer:
The team can conclude that it has a rough early sense of the model's main error categories. It should not claim a complete or exact diagnosis, because reviewing 18 mistakes only supports a preliminary view.

Key points:
- Manual review of 18 mistakes
- Validation examples
- Main error categories
- Rough initial understanding rather than a complete account

Rubric:
Full credit requires stating that the review gives only a rough sense of the major error categories and does not justify claiming complete or exact knowledge.

What can a team conclude after checking a small batch of model mistakes?

Question:
Answer in one to three sentences: What benefit comes from manually reviewing about 25 mistakes made by a classifier on validation examples?

Sample answer:
That review begins to reveal the main patterns behind the model's failures. It gives a quick, rough picture of the most important error sources rather than a complete diagnosis.

Key points:
- Rough picture
- Main failure patterns
- About 25 reviewed mistakes

Rubric:
The answer must state that reviewing about 25 mistakes begins to provide a rough sense of the main error sources.

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