arXiv Computation and Language By Ziyang Ling, Ziyi Chen, Ronald X. Xu, Mingzhai Sun

Beyond Reachability: A Relation-Semantic Reasoning Framework for Biomedical Multi-hop QA

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The paper introduces ReSemReason, a framework for biomedical multi-hop question answering that addresses the reachable-but-invalid problem—where correct answers are retrieved but lack valid evidential support. ReSemReason aligns question-induced relation schemas with graph search and employs relation-conditioned attention and uncertainty-weighted priors to improve both answer ranking and evidence quality. Experiments on BioHopR, PrimeKGQA, and MedReason demonstrate enhanced answer-set quality and provide analyses distinguishing endpoint correctness from evidential support.

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