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Beam search: child ancestry points to sorted candidate position rather than source parent · case 04
child ancestry points to sorted candidate position rather than source parent.
Case contract
Candidates [parent,score,token]; return selected rows [parent,token] after global top width.
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 |
|---|---|---|---|
| sorted child keeps source | [[0, "b"], [1, "c"]] | [[3, "b"], [7, "c"]] | Failed |
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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.
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