FA-98154 / Attention mask construction / Member archive
Padded query rows can attend to real keys · case 04
Padded query rows can attend to real keys.
Case contract
Square matrix; pair visibility requires query valid, key valid and key<=query.
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 |
|---|---|---|---|
| padded query row | [[true, false, false, false, false], [true, true, false, false, false], [true, true, true, false, false], [true, true, true, true, false], [true, true, true, true, false]] | [[true, false, false, false, false], [true, true, false, false, false], [true, true, true, false, false], [true, true, true, true, false], [false, false, false, false, false]] | Failed |
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