知识图谱或图为强化学习的状态和动作选择提供语义信息得到更好的表示来优化强化学习的过程。(将知识图谱作为外部信息引入强化学习框架中，用来引导强化学习探索过程)

Unified Conversational Recommendation Policy Learningvia Graph-based Reinforcement Learning 2021 SIGIR

Interactive Recommender System via Knowledge Graph-enhanced Reinforcement Learning 2020 SIGIR

Interactive Path Reasoning on Graph for Conversational Recommendation 2020 KDD

KERL: A Knowledge-Guided Reinforcement Learning Modelfor Sequential Recommendation 2020 SIGIR将实际问题建模为包含多种节点类型和关系类型的知识图谱，强化学习在知识图谱上进行探索学习策略

Reinforcement Knowledge Graph Reasoning for Explainable Recommendation 2019 SIGIR

Reinforced Anchor Knowledge Graph Generation for News Recommendation Reasoning 2021 KDD

Leveraging demonstrations for reinforcement recommendation reasoning over knowledge graphs 2020 SIGIRMulti-modal knowledgeaware reinforcement learning network for explainable recommendation 2021 KBS  Reinforcement learning over sentiment-augmented knowledge graphs towards accurate and explainable recommendation 2022 WSDMReinforced negative sampling over knowledge graph for recommendation 2020 WWWReinforced KGs Reasoning for Explainable Sequential Recommendation World Wide Web （CCF B类）2022Multi-level Recommendation Reasoning over Knowledge Graphs with Reinforcement Learning 2022 WWWExplainable knowledge graph-based recommendation via deep reinforcement learning 2019or2022???? arxiv  

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