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Beam search: child score drops its parent history · case 02
child score drops its parent history.
Case contract
Given parent scores and [parent_index, token_delta] expansions, return cumulative child scores in expansion order.
Why this case matters
Beam decoders rely on consistent hypothesis state while expanding and ranking candidates.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| two parent histories | [-1, -2] | [-3, -6] | Failed |
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