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Andre Bacellar

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#machine learning Preprint Sep 2026

Predictable Failure in Multi-Hop Retrieval: Score-Distributional Confidence Scoring and Abstention

It is proved that no single ANN score feature achieves best predictive performance across all failure regimes; the dominant feature differs between datasets (query length on MuSiQue, hop-1 concentration on HoVer), and a constructive witness pair shows each is necessary in one regime and non-contributory in the other.

Andre Bacellar · 2 citations

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