FA-100035 / Evaluation metric aggregation / Member archive
Multiclass MCC reports accuracy instead of correlation · case 05
Multiclass MCC reports accuracy instead of correlation.
Case contract
Return multiclass Matthews correlation coefficient for the supplied label set using the confusion-matrix formula; zero denominator yields 0.
Why this case matters
A small explicit evaluation contract makes aggregation behavior reproducible across labeled examples.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| binary inverse | 0.0 | -1 | Failed |
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