FA-98927 / Gradient accumulation weighting / Member archive
Running mean state treats a batch mean as a batch sum · case 02
Running mean state treats a batch mean as a batch sum.
Case contract
State is [mean_so_far, count_so_far]. Combine its implied sum with the incoming batch mean times batch_count, then return the new mean and count.
Why this case matters
A deterministic toy model isolates one local accumulation contract.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| unequal counts | [7.0, 4] | [19.0, 4] | Failed |
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