FA-97844 / Dataset split isolation / Member archive
Dataset split: one group appears on both sides · case 04
one group appears on both sides.
Case contract
Rows are [id,group]. Return IDs assigned to train under the supplied group->side map; unknown groups are validation.
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 |
|---|---|---|---|
| same group | ["a"] | ["a", "b"] | Failed |
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