FA-98183 / Attention mask construction / Member archive
Cross-attention mask swaps source and query dimensions · case 03
Cross-attention mask swaps source and query dimensions.
Case contract
Return QxS visibility from target queries to every valid source key; query values do not affect visibility.
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 |
|---|---|---|---|
| rectangular source | [[true, true], [true, true], [true, true], [true, true], [true, true]] | [[true, true, true, false, true], [true, true, true, false, true]] | Failed |
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