Graph Neural Networks in Recommender Systems: A Survey

• Published in: ACM computing surveys Vol. 55; no. 5; pp. 1 - 37
• Main Authors: Wu, Shiwen, Sun, Fei, Zhang, Wentao, Xie, Xu, Cui, Bin
• Format: Journal Article
• Language: English
• Published: New York, NY ACM 01.06.2023; Association for Computing Machinery
• Subjects: Computer science; Graph neural networks; Graph representations; Graphical representations; Information Systems; Machine learning; Neural networks; Recommender systems; System effectiveness; Taxonomy; survey; Recommender system; graph neural network
• ISSN: 0360-0300; 1557-7341
• DOI: 10.1145/3535101

With the explosive growth of online information, recommender systems play a key role to alleviate such information overload. Due to the important application value of recommender systems, there have always been emerging works in this field. In recommender systems, the main challenge is to learn the effective user/item representations from their interactions and side information (if any). Recently, graph neural network (GNN) techniques have been widely utilized in recommender systems since most of the information in recommender systems essentially has graph structure and GNN has superiority in graph representation learning. This article aims to provide a comprehensive review of recent research efforts on GNN-based recommender systems. Specifically, we provide a taxonomy of GNN-based recommendation models according to the types of information used and recommendation tasks. Moreover, we systematically analyze the challenges of applying GNN on different types of data and discuss how existing works in this field address these challenges. Furthermore, we state new perspectives pertaining to the development of this field. We collect the representative papers along with their open-source implementations in https://github.com/wusw14/GNN-in-RS.