FA-98889 / Gradient accumulation weighting / Member archive

A parameter absent from a microbatch is counted as a zero update · case 04

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

Member previewVariant 4 · 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	`[8.0, 8.0]`	`[12, 12]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.