FA-99307 / Distributed training aggregation / Member archive
All-reduce silently truncates vectors with mismatched shapes · case 02
All-reduce silently truncates vectors with mismatched shapes.
Case contract
Given worker vectors, return elementwise sum if all lengths match, otherwise None; empty input returns [].
Why this case matters
A toy distributed-training contract makes replica and shard contribution rules explicit without claiming framework compatibility or performance.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| mismatch rejected | [8] | null | Failed |
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