Abstract
In recent years, Cross-Domain Recommendation (CDR) has drawn significant attention, which utilizes user data from multiple domains to enhance the recommendation performance. However, current CDR methods require sharing user data across domains, thereby violating the General Data Protection Regulation (GDPR). Consequently, numerous approaches have been proposed for Federated Cross-Domain Recommendation (FedCDR). Nevertheless, the data heterogeneity across different domains inevitably influences the overall performance of federated learning. In this study, we propose FedHCDR, a novel Federated Cross-Domain Recommendation framework with Hypergraph signal decoupling. Specifically, to address the data heterogeneity across domains, we introduce an approach called hypergraph signal decoupling (HSD) to decouple the user features into domain-exclusive and domain-shared features. The approach employs high-pass and low-pass hypergraph filters to decouple domain-exclusive and domain-shared user representations, which are trained by the local-global bi-directional transfer algorithm. In addition, a hypergraph contrastive learning (HCL) module is devised to enhance the learning of domain-shared user relationship information by perturbing the user hypergraph. Extensive experiments conducted on three real-world scenarios demonstrate that FedHCDR outperforms existing baselines significantly (Code available at https://github.com/orion-orion/FedHCDR).
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Acknowledgments
This work is supported by Guangdong Major Project of Basic and Applied Basic Researche (No. 2019B03030200245), the National Natural Science Foundation of China (62227808), and Shenzhen Science and Technology Program (Grant No. ZDSYS20210623091809029).
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Zhang, H. et al. (2024). FedHCDR: Federated Cross-Domain Recommendation with Hypergraph Signal Decoupling. In: Bifet, A., Davis, J., Krilavičius, T., Kull, M., Ntoutsi, E., Žliobaitė, I. (eds) Machine Learning and Knowledge Discovery in Databases. Research Track. ECML PKDD 2024. Lecture Notes in Computer Science(), vol 14941. Springer, Cham. https://doi.org/10.1007/978-3-031-70341-6_21
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DOI: https://doi.org/10.1007/978-3-031-70341-6_21
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