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Dataset split: class representation is uneven across group partitions · case 04
class representation is uneven across group partitions.
Case contract
Each group maps to a list of labels. Return group IDs assigned to train by greedy least-filled label bins; groups stay whole, ties by ID.
Why this case matters
This toy split allocator makes membership rules explicit for reproducible evaluation fixtures.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| mixed group stays intact | ["a", "b"] | ["a"] | Failed |
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