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An empty microbatch dilutes the equal-microbatch mean · case 04

An empty microbatch dilutes the equal-microbatch mean.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Inputs are already per-microbatch means and a positive participation count. Average nonempty microbatch means equally; empty batches are ignored.

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 fixtureActualExpectedOutcome
empty batch skipped14.028Failed

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