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arxiv: 2605.30237 · v2 · pith:OTTTGQXOnew · submitted 2026-05-28 · 💻 cs.IR · cs.CL· cs.LG

GRASP: Plan-Guided Graph Retrieval with Adaptive Fusion and Reranking on Semi-Structured Knowledge Bases

Yicheng Tao , Yiqun Wang , Xiangchen Song , Xin Luo , Kai Liu , Jie Liu This is my paper
classification 💻 cs.IR cs.CLcs.LG
keywords graphgraspretrievalbasesfine-tunedfusionknowledgesearch
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Semi-structured knowledge bases (SKBs) embed textual documents in a typed graph of entities and relations, and underpin applications such as product search, academic paper search, and precision-medicine inquiries. Existing hybrid retrieval systems on SKBs either use the graph only for query expansion, mix textual and structural branches under a global weighting, or rely on fine-tuned graph-traversal generators. We present GRASP, a three-stage SKB retrieval framework unifying plan-based graph retrieval, plan-conditioned fusion with a dense retriever, and a fine-tuned reranker over the fused candidates. GRASP substantially advances the state of the art on every metric across the three STaRK benchmarks, lifting average Hit@1 from 62.0 to 73.9. Ablation and sensitivity studies further confirm the effectiveness and robustness of GRASP.

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