FA-99022 / Optimizer update state / Member archive
Missing gradient is confused with a zero gradient · case 02
Missing gradient is confused with a zero gradient.
Case contract
present=True denotes an observed zero gradient: halve m and v and leave p unchanged. present=False denotes no observation: preserve all three values.
Why this case matters
Optimizer implementations must associate each parameter with its own mathematically specified update state.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| absent keeps moments | [3, 2.0, 4.0] | [3, 4, 8] | Failed |
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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.
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