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Sequence means are averaged for a token-mean objective · case 02

Sequence means are averaged for a token-mean objective.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Aggregate sequence loss sums and token counts, then divide once by total tokens. No tokens yields zero.

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
different lengths3.03.5Failed

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