FA-98178 / Attention mask construction / Member archive
Cached rectangular attention uses local instead of absolute positions · case 03
Cached rectangular attention uses local instead of absolute positions.
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 fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| partial cache offset | [[true, false, false, false, false, false], [true, true, false, false, false, false]] | [[true, true, true, true, false, false], [true, true, true, true, true, false]] | Failed |
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