Author

Xuhang Shi

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Preprint Aug 2026

EvLink: Source-Grounded Evidence Linking for Graph RAG

Graph-based Retrieval-Augmented Generation (GraphRAG) supports multi-hop reasoning by organizing corpora into structured graphs. However, graph reachability often captures semantic association rather than evidence support, so a reachable passage may still fail to justify a required cross-passage transition. We propose...

Lin-Yao Zheng, Xu-Hang Shi, Zhi-Fang Mao et al. · 0 citations

Preprint Aug 2026

HELENA:Hierarchical Sparse Coordination over a Union of Complementary Topologies for MAS

Hierarchical Sparse Coordination over a Union of Complementary Topologies for MAS (HELENA) is proposed, a multi-agent framework that balances diverse reasoning paths with sparse task-dependent execution.

Zhifang Mao, Linyao Zheng, Xuhang Shi et al. · 0 citations

Preprint Aug 2026

LineageRAG: Harnessing GraphRAG by Constructing Evidence Lineages with Source Grounding

The proposed LineageRAG is a graph-based Retrieval-Augmented Generation method, which constructs one evidence for each query-derived evidence demand and completes it with a verbatim source span when the selected evidence supports that demand.

Lin-Yao Zheng, Xu-Hang Shi, Zhi-Fang Mao et al. · 0 citations