%0 Conference Paper %1 Zhang2023 %A Zhang, Xiaoyu %A Xin, Xin %A Li, Dongdong %A Liu, Wenxuan %A Ren, Pengjie %A Chen, Zhumin %A Ma, Jun %A Ren, Zhaochun %B Proceedings of the Sixteenth ACM International Conference on Web Search and Data Mining %C New York, NY, USA %D 2023 %I Association for Computing Machinery %K graph-based knowled recommendation %P 231–239 %R 10.1145/3539597.3570426 %T Variational Reasoning over Incomplete Knowledge Graphs for Conversational Recommendation %U https://doi.org/10.1145/3539597.3570426 %X Conversational recommender systems (CRSs) often utilize external knowledge graphs (KGs) to introduce rich semantic information and recommend relevant items through natural language dialogues. However, original KGs employed in existing CRSs are often incomplete and sparse, which limits the reasoning capability in recommendation. Moreover, only few of existing studies exploit the dialogue context to dynamically refine knowledge from KGs for better recommendation. To address the above issues, we propose the Variational Reasoning over Incomplete KGs Conversational Recommender (VRICR). Our key idea is to incorporate the large dialogue corpus naturally accompanied with CRSs to enhance the incomplete KGs; and perform dynamic knowledge reasoning conditioned on the dialogue context. Specifically, we denote the dialogue-specific subgraphs of KGs as latent variables with categorical priors for adaptive knowledge graphs refactor. We propose a variational Bayesian method to approximate posterior distributions over dialogue-specific subgraphs, which not only leverages the dialogue corpus for restructuring missing entity relations but also dynamically selects knowledge based on the dialogue context. Finally, we infuse the dialogue-specific subgraphs to decode the recommendation and responses. We conduct experiments on two benchmark CRSs datasets. Experimental results confirm the effectiveness of our proposed method. %@ 9781450394079

@inproceedings{Zhang2023, abstract = {Conversational recommender systems (CRSs) often utilize external knowledge graphs (KGs) to introduce rich semantic information and recommend relevant items through natural language dialogues. However, original KGs employed in existing CRSs are often incomplete and sparse, which limits the reasoning capability in recommendation. Moreover, only few of existing studies exploit the dialogue context to dynamically refine knowledge from KGs for better recommendation. To address the above issues, we propose the Variational Reasoning over Incomplete KGs Conversational Recommender (VRICR). Our key idea is to incorporate the large dialogue corpus naturally accompanied with CRSs to enhance the incomplete KGs; and perform dynamic knowledge reasoning conditioned on the dialogue context. Specifically, we denote the dialogue-specific subgraphs of KGs as latent variables with categorical priors for adaptive knowledge graphs refactor. We propose a variational Bayesian method to approximate posterior distributions over dialogue-specific subgraphs, which not only leverages the dialogue corpus for restructuring missing entity relations but also dynamically selects knowledge based on the dialogue context. Finally, we infuse the dialogue-specific subgraphs to decode the recommendation and responses. We conduct experiments on two benchmark CRSs datasets. Experimental results confirm the effectiveness of our proposed method.}, added-at = {2024-05-02T12:04:48.000+0200}, address = {New York, NY, USA}, author = {Zhang, Xiaoyu and Xin, Xin and Li, Dongdong and Liu, Wenxuan and Ren, Pengjie and Chen, Zhumin and Ma, Jun and Ren, Zhaochun}, biburl = {https://www.bibsonomy.org/bibtex/28ba5d5d781cf5e3ee128da72837bc37f/e.fischer}, booktitle = {Proceedings of the Sixteenth ACM International Conference on Web Search and Data Mining}, day = 27, description = {https://dl.acm.org/doi/pdf/10.1145/3539597.3570426}, doi = {10.1145/3539597.3570426}, interhash = {5cbbaf5c0aba8e7fdffdd731b39bfc8c}, intrahash = {8ba5d5d781cf5e3ee128da72837bc37f}, isbn = {9781450394079}, keywords = {graph-based knowled recommendation}, location = {<conf-loc>, <city>Singapore</city>, <country>Singapore</country>, </conf-loc>}, month = {2}, pages = {231–239}, publisher = {Association for Computing Machinery}, series = {WSDM '23}, timestamp = {2024-05-02T12:05:05.000+0200}, title = {Variational Reasoning over Incomplete Knowledge Graphs for Conversational Recommendation}, url = {https://doi.org/10.1145/3539597.3570426}, year = 2023 }