FA-98313 / Autoregressive target shifting / Member archive
Loss denominator counts inputs instead of supervised targets · case 03
Loss denominator counts inputs instead of supervised targets.
Case contract
For labels and an aligned mask, count true mask entries at target indexes labels[1:]. Short masks contribute only where present.
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 |
|---|---|---|---|
| trailing context excluded | 3 | 2 | Failed |
MEMBER ARCHIVE
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