FA-98147 / Attention mask construction / Member archive
Padded keys remain visible to active queries · case 02
Padded keys remain visible to active queries.
Case contract
Return rows for every query; a key is visible iff valid and key_index<=query_index.
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 final key | [[true, false, false], [true, true, false], [true, true, true]] | [[true, false, false], [true, true, false], [true, true, false]] | Failed |
MEMBER ARCHIVE
The complete case is available to members.
This record includes three runnable implementations, regression fixtures, execution results, and source hashes.
Member access is invitation-based. Sign in with your invited account to inspect the sources.
Sign in to the archive ↗