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Cached rectangular attention uses local instead of absolute positions · case 05

Cached rectangular attention uses local instead of absolute positions.

Member previewVariant 5 · 3 implementations · 6 checks per implementation

Case contract

Queries occupy absolute positions [query_start, query_start+Q); keys are absolute [0,K).

Why this case matters

A small explicit visibility matrix makes sequence-attention boundary behavior reviewable.

One recorded failure

Sample boundary fixture

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

Boundary fixtureActualExpectedOutcome
partial cache offset[[true, false, false, false, false, false, false, false], [true, true, false, false, false, false, false, false]][[true, true, true, true, true, true, false, false], [true, true, true, true, true, true, true, false]]Failed

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

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