FA-99278 / Distributed training aggregation / Member archive
Non-owner replicas contribute gradients for an owned shard · case 03
Non-owner replicas contribute gradients for an owned shard.
Case contract
Rows [shard_id, worker_id, owner_id, gradient]; sum only rows where worker equals owner, grouped by shard. Return sorted [shard,total] pairs.
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 |
|---|---|---|---|
| ignore replica copy | [["x", 30], ["y", 6]] | [["x", 3], ["y", 6]] | Failed |
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