FA-99305 / Distributed training aggregation / Member archive
Reduce-scatter gives every rank the first slice · case 05
Reduce-scatter gives every rank the first slice.
Case contract
Sum equal-length worker vectors, then return width values beginning at rank*width; invalid/empty slices return [].
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 |
|---|---|---|---|
| rank one | [15, 22] | [33, 44] | Failed |
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