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ACL Findings2026

Progressive Planning and Reinforced Reasoning: Large Language Model-Guided Multi-hop Question Answering over Knowledge Graph

Xiang Li, Runhai Jiao, Ruifan Li, Dongnan Wu, Ruojiao Qiao, Lei Liu

Abstract

Reinforcement learning, with its interpretable path reasoning, has emerged as a promising paradigm for multi-hop question answering over knowledge graphs. However, existing approaches suffer from two inherent limitations: (1) lacking effective intermediate guidance, agents often fall into aimless exploration when confronted with complex multi-hop questions; and (2) policy networks focus on local neighborhood information, making it difficult to anticipate the long-term consequences of decisions. To address these challenges, we propose a Progressive Planning and Reinforced Reasoning (PPRR) framework. Specifically, we introduce large language models as multihop reasoning planners, converting decomposed sub-question sequences into stepwise decision guidance and thereby granting the agent human-like, step-by-step problem-solving capabilities. In addition, we design a structureaware lookahead policy network, which explicitly models inter-node dependencies along the multi-hop reasoning process and performs lookahead value evaluations for candidate actions, thereby enhancing the agent's global state awareness and decision foresight in complex environments. Finally, we conducted extensive experiments on four public multi-hop question answering benchmarks and one domainspecific dataset. The results demonstrate that our framework surpasses state-of-the-art methods while demonstrating strong generalization.

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Builds on19

  1. Improving Multi-hop Question Answering over Knowledge Graphs using Knowledge Base EmbeddingsApoorv Saxena, Aditay Tripathi, Partha P. TalukdarACL 2020 · 488 citations
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  3. Plan-on-Graph: Self-Correcting Adaptive Planning of Large Language Model on Knowledge GraphsLiyi Chen, Panrong Tong, Zhongming Jin, Ying Sun et al.NeurIPS 2024 · 160 citations
  4. Search-in-the-Chain: Interactively Enhancing Large Language Models with Search for Knowledge-intensive TasksShicheng Xu, Liang Pang, Huawei Shen, Xueqi Cheng et al.WWW 2024 · 104 citations
  5. Reinforcement Learning from Reformulations in Conversational Question Answering over Knowledge GraphsMagdalena Kaiser, Rishiraj Saha Roy, Gerhard WeikumSIGIR 2021 · 45 citations

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