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Relevance 7/10Data and MetricsAdvanced6 min read
Hard Negative Mining
Hard negative mining collects confusing non-target examples that models frequently misclassify.
Why it matters for annotators
It improves boundary learning and reduces false positives.
Visual mental model
Error cases -> hard negatives -> targeted retraining.
Examples (bad vs good)
Scenario: Real annotation scenario involving Hard Negative Mining
Bad: Labeling quickly without applying project rubric.
Good: Applying rubric criteria, documenting rationale, and escalating uncertainty.
Common mistakes
- Skipping guideline details for edge cases.
- Applying inconsistent criteria across similar samples.
- Avoiding escalation even when uncertain.
Submission checklist
- Read the latest guideline update before each batch.
- Apply rubric dimensions explicitly in each decision.
- Escalate ambiguous items with concise rationale.