FA-98237 / Attention mask construction / Member archive
Cross-attention mask omits the source interval limit · case 02
Cross-attention mask omits the source interval limit.
Case contract
Query q sees source indices in [q+offset-left, q+offset+right], clipped to source bounds; left and right are nonnegative.
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 |
|---|---|---|---|
| moving source window | [[true, true, true, true, true], [true, true, true, true, true], [true, true, true, true, true]] | [[true, true, false, false, false], [false, true, true, false, false], [false, false, true, true, false]] | Failed |
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