FA-98887 / Gradient accumulation weighting / Member archive

A parameter absent from a microbatch is counted as a zero update · case 02

A parameter absent from a microbatch is counted as a zero update.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Rows are microbatch coordinate sums; None means a parameter was absent and contributes zero to the mean over all microbatches. active_counts documents participation but is not a divisor.

Why this case matters

A deterministic toy model isolates one local accumulation contract.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
missing treated as zero	`[4.0, 4.0]`	`[6, 6]`	Failed

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