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Replica mean omits one received contribution from its denominator · case 02
Replica mean omits one received contribution from its denominator.
Case contract
Given a list of scalar replica gradients, return their arithmetic mean; empty input returns 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 |
|---|---|---|---|
| two replicas | 8.0 | 4 | Failed |
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