FA-98317 / Autoregressive target shifting / Member archive
Ignored targets remain in the loss denominator · case 02
Ignored targets remain in the loss denominator.
Case contract
Count true mask entries whose indexes correspond to labels[1:]; absent mask positions count as false.
Why this case matters
A small deterministic token-stream contract makes next-token alignment errors inspectable.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| ignored target mask | 2 | 1 | Failed |
MEMBER ARCHIVE
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