FA-99323 / Distributed training aggregation / Member archive
Worker variances omit between-worker spread · case 03
Worker variances omit between-worker spread.
Case contract
Each worker supplies [count,sum,sumsq]; return the global population variance rounded to 12 decimals, or None when total count is zero.
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 |
|---|---|---|---|
| between-worker spread | 0.0 | 1 | Failed |
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