Confidential — Stefan Michaelcheck Only

A Query-Driven Graph Retrieval Framework with Adaptive Pruning for Multi-Hop Question Answering

2026reasoning enablementincrementalmethod

Hao Wang, Lihang Feng, Tianyue Wang, Zhongyi Sun, He Li

Electronics

https://doi.org/10.3390/electronics15061263OpenAlex: W7139010987
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GPT-5.5 Abstract Analysis

Problems Identified (4)

MHQA distributed evidence reasoning: Multi-hop question answering requires retrieving and reasoning over evidence distributed across multiple documents.

Flat RAG reasoning-chain weakness: Conventional flat retrieval-augmented generation approaches struggle to maintain coherent reasoning chains when implicit dependencies among entities and documents are involved.

MHQA distributed evidence reasoning: Multi-hop question answering requires retrieving and reasoning over evidence distributed across multiple documents.

Flat RAG reasoning-chain weakness: Conventional flat retrieval-augmented generation approaches struggle to maintain coherent reasoning chains when implicit dependencies among entities and documents are involved.

Proposed Solutions (5)

Query-driven dual-layer graph retrieval: The paper proposes a query-driven dual-layer graph retrieval framework for multi-hop question answering.

Heterogeneous graph joint entity-relation retrieval: The framework uses a unified heterogeneous graph of entities, relations, and supporting texts and dynamically constructs candidate subgraphs via joint entity and relation retrieval plus lexical retrieval signals.

Contrastive structural path scoring: Reasoning paths are refined by combining structural strength modeling with contrastive learning-based path scoring.

Query-adaptive evidence pruning: An adaptive pruning strategy regulates evidence scale according to query complexity and path score distributions.

Query-driven dual-layer graph retrieval: The paper proposes a query-driven dual-layer graph retrieval framework for multi-hop question answering.

Results (3)

Higher MHQA accuracy than baselines:

Improved complex multi-hop performance:

Structured query-adaptive evidence importance:

Research Domain

Multi-hop question answering / graph retrieval / retrieval-augmented generation

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