From One Test Set to a Slice Test Bench
Explain why a fairness-aware test bench must cover operational slices, not only a convenient aggregate test set.
The mobile check-deposit OCR model looks strong in the lab but weak in predictable real-world conditions. What does the better test setup change? Before: one clean lab test set, one blended pass rate. After: slice tests expose who needs a fix or fallback. The metric changed from one pass rate to slice-level reliability. That matters because quality-of-service harms are hidden when the majority condition dominates the test set. The test data changed from convenient lab images to operational conditions. Device age, lighting, and image quality are not edge cases when real users depend on them. The release gate changed from…
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