FA-98197 / Attention mask construction / Member archive
Global tokens are incorrectly limited by local window · case 02
Global tokens are incorrectly limited by local window.
Case contract
Causal local window W; any listed global key <= query is visible at any distance.
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 |
|---|---|---|---|
| old global key | [[true, false, false, false], [true, true, false, false], [false, true, true, false], [false, false, true, true]] | [[true, false, false, false], [true, true, false, false], [true, true, true, false], [true, false, true, true]] | Failed |
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