FA-98377 / Token sampling filters / Member archive
Token sampling: Presence penalty scales with repeated history count · case 02
Presence penalty scales with repeated history count.
Case contract
Subtract penalty exactly once from each scored token appearing at least once in history; other scores are unchanged.
Why this case matters
A finite, deterministic token-selection contract isolates one decoding operation from model inference and runtime behavior.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| duplicate history | {"a": 0.5, "b": 2.0} | {"a": 3.5, "b": 2.0} | Failed |
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