FA-99273 / Distributed training aggregation / Member archive
A missing parameter shard silently shortens reconstruction · case 03
A missing parameter shard silently shortens reconstruction.
Case contract
Given shards [start, values] and total length, return concatenated values only when intervals exactly cover the range once; otherwise None.
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 |
|---|---|---|---|
| interior gap overlap disguise | [0, 1, 2, 2, 3] | null | Failed |
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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.
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