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Grouped accuracy includes empty groups as zero · case 03

Grouped accuracy includes empty groups as zero.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Rows are [group,truth,prediction]. Return the unweighted mean accuracy among requested groups represented by rows; no represented requested groups yields 0.

Why this case matters

A small explicit evaluation contract makes aggregation behavior reproducible across labeled examples.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
empty requested group	`0.5`	`1`	Failed

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