FA-98187 / Attention mask construction / Member archive
Causal ordering hides valid encoder states in cross-attention · case 02
Causal ordering hides valid encoder states in cross-attention.
Case contract
Cross-attention visibility is source-key validity replicated for each decoder 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 |
|---|---|---|---|
| later source visible | [[true, false, false], [true, true, false]] | [[true, true, false], [true, true, false]] | Failed |
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