FA-98215 / Attention mask construction / Member archive
Sliding window stops after the initial query rows · case 05
Sliding window stops after the initial query rows.
Case contract
For each query i in a sequence of length L, visible keys are max(0,i-W+1)..i; W<=0 means none.
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 boundary | [[true, false, false, false, false, false, false, false], [true, true, false, false, false, false, false, false], [false, false, false, false, false, false, false, false], [false, false, false, false, false, false, false, false], [false, false, false, false, false, false, false, false], [false, false, false, false, false, false, false, false], [false, false, false, false, false, false, false, false], [false, false, false, false, false, false, false, false]] | [[true, false, false, false, false, false, false, false], [true, true, false, false, false, false, false, false], [false, true, true, false, false, false, false, false], [false, false, true, true, false, false, false, false], [false, false, false, true, true, false, false, false], [false, false, false, false, true, true, false, false], [false, false, false, false, false, true, true, false], [false, false, false, false, false, false, true, true]] | Failed |
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