FA-98904 / Gradient accumulation weighting / Member archive
Streaming accumulation overwrites its prior numerator · case 04
Streaming accumulation overwrites its prior numerator.
Case contract
State is [gradient_sum, example_count]. Appending adds both fields independently and returns the updated state.
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 |
|---|---|---|---|
| append unequal batch | [48, 12] | [56, 16] | Failed |
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