CustomFair: A Customized Fairness Method for Federated Recommender Systems in Social Internet of Things

Guorong Chen, Chao Li*, Fei Du, Xiaohan Yuan, Cheng Chi*, Zihang Yin, Bin Wang*, Tao Li, Xuhua Bao, Wei Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In the Social Internet of Things (SIoT), edge computing integrates artificial intelligence to learn intricate relationships. The scale and complexity of SIoT cause a data explosion from diverse objects, hindering tailored services to users who own objects. Moreover, conventional edge computing in SIoT depends on centralized data collection, raising concerns about data privacy. To address the above two issues, federated recommender systems (FRSs) present a promising solution. FRSs can provide SIoT services to users and train a shared model while retaining sensitive data locally on objects. However, as FRSs are driven by data, they are inherently susceptible to algorithmic bias, raising substantial fairness concerns that have attracted considerable attention in SIoT. Recent fairness studies predominantly concentrate on a single sensitive attribute for users, thereby overlooking their autonomy. Therefore, we propose CustomFair, a personalized fairness framework that enables users in FRSs to select preferred sensitive attributes and acquire satisfied recommendation services in SIoT scenarios. First, we define customized fairness to ensure group fairness based on users' sensitive attributes. The server segments users into subgroups in a privacy-preserving manner. Second, CustomFair employs the DynBalance method with a flexible regularization coefficient to improve recommendation performance and utilizes the AdaptEpoch strategy to achieve fairness. Extensive experiments indicate that CustomFair improves recommendation performance by 0.1 ∼ 42.92 and enhances fairness by reducing disparities of 0.03 ∼ 5.41 compared to two baselines across three datasets.

Original languageEnglish
JournalIEEE Internet of Things Journal
DOIs
Publication statusAccepted/In press - 2024
Externally publishedYes

Keywords

  • fairness
  • federated recommender systems
  • social internet of things

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Chen, G., Li, C., Du, F., Yuan, X., Chi, C., Yin, Z., Wang, B., Li, T., Bao, X., & Wang, W. (Accepted/In press). CustomFair: A Customized Fairness Method for Federated Recommender Systems in Social Internet of Things. IEEE Internet of Things Journal. https://doi.org/10.1109/JIOT.2024.3482703