XViewRank: Overlap-Conditioned Score Fusion for LLM-Augmented Sparse Retrieval
XViewRank is presented, a lightweight retrieval-side method for conditionally fusing BM25 results from an original query, a hypothesis view, and a step-back view, and the results support overlap-conditioned score fusion as a compact retrieval-side alternative to fixed fusion, while also delimiting where its advantage i...