FA-98288 / Autoregressive target shifting / Member archive
The final in-window context token is omitted · case 03
The final in-window context token is omitted.
Case contract
For tokens and stop, pair indexes 0 through min(stop,len(tokens)-1)-1 with their successors.
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 |
|---|---|---|---|
| last allowed context | [[0, 1], [1, 2]] | [[0, 1], [1, 2], [2, 3]] | Failed |
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