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As a promising privacy-aware collaborative model training paradigm, Federated Learning (FL) is becoming popular in the design of distributed recommender systems. However, Federated Recommender Systems (FedRecs) greatly suffer from two major…

Machine Learning · Computer Science 2025-07-15 Zhufeng Lu , Chentao Jia , Ming Hu , Xiaofei Xie , Mingsong Chen

Federated learning (FL) allows multiple clients to collectively train a high-performance global model without sharing their private data. However, the key challenge in federated learning is that the clients have significant statistical…

Machine Learning · Computer Science 2022-03-23 Liang Gao , Huazhu Fu , Li Li , Yingwen Chen , Ming Xu , Cheng-Zhong Xu

In the era of increasing privacy concerns and demand for personalized experiences, traditional Reinforcement Learning with Human Feedback (RLHF) frameworks face significant challenges due to their reliance on centralized data. We introduce…

Machine Learning · Computer Science 2025-02-11 Flint Xiaofeng Fan , Cheston Tan , Yew-Soon Ong , Roger Wattenhofer , Wei-Tsang Ooi

With the development of wireless network, Multi-Access Edge Computing (MEC) and Artificial Intelligence (AI)-native Radio Access Network (RAN) have attracted significant attention. Particularly, the integration of AI-RAN and MEC is…

Machine Learning · Computer Science 2026-03-11 Luyao Zou , Hayoung Oh , Chu Myaet Thwal , Apurba Adhikary , Seohyeon Hong , Zhu Han

Federated learning aims at training models collaboratively across participants while protecting privacy. However, one major challenge for this paradigm is the data heterogeneity issue, where biased data preferences across multiple clients,…

Machine Learning · Computer Science 2025-07-21 Huan Wang , Haoran Li , Huaming Chen , Jun Yan , Jiahua Shi , Jun Shen

Federated Learning (FL) has emerged as a groundbreaking distributed learning paradigm enabling clients to train a global model collaboratively without exchanging data. Despite enhancing privacy and efficiency in information retrieval and…

Machine Learning · Computer Science 2024-10-30 Long Tan Le , Tuan Dung Nguyen , Tung-Anh Nguyen , Choong Seon Hong , Suranga Seneviratne , Wei Bao , Nguyen H. Tran

Federated Collaborative Filtering (FedCF) is an emerging field focused on developing a new recommendation framework with preserving privacy in a federated setting. Existing FedCF methods typically combine distributed Collaborative Filtering…

Information Retrieval · Computer Science 2024-12-11 Zhiwei Li , Guodong Long , Tianyi Zhou , Jing Jiang , Chengqi Zhang

Federated Recommender Systems (FedRecs) leverage federated learning to protect user privacy by retaining data locally. However, user embeddings in FedRecs often encode sensitive attribute information, rendering them vulnerable to attribute…

Information Retrieval · Computer Science 2025-12-01 Yuyuan Li , Junjie Fang , Fengyuan Yu , Xichun Sheng , Tianyu Du , Xuyang Teng , Shaowei Jiang , Linbo Jiang , Jianan Lin , Chaochao Chen

Cross-platform recommendation aims to improve recommendation accuracy by gathering heterogeneous features from different platforms. However, such cross-silo collaborations between platforms are restricted by increasingly stringent privacy…

Information Retrieval · Computer Science 2024-01-31 Sheng Wan , Dashan Gao , Hanlin Gu , Daning Hu

The robustness of federated learning (FL) is vital for the distributed training of an accurate global model that is shared among large number of clients. The collaborative learning framework by typically aggregating model updates is…

Federated learning (FL) enables collaborative model training across distributed clients while preserving data privacy. However, data and system heterogeneity often cause catastrophic forgetting and unbounded drift in model updates, leading…

Machine Learning · Computer Science 2026-04-28 Taehwan Yoon , Bongjun Choi , Wesley De Neve

A vast amount of user behavior data is constantly accumulating on today's large recommendation platforms, recording users' various interests and tastes. Preserving knowledge from the old data while new data continually arrives is a vital…

Information Retrieval · Computer Science 2024-01-24 Jiarui Qin , Weiwen Liu , Ruiming Tang , Weinan Zhang , Yong Yu

Federated Learning (FL) suffers significant performance degradation in real-world deployments characterized by moderate to extreme statistical heterogeneity (non-IID client data). While global aggregation strategies promote broad…

Machine Learning · Computer Science 2026-03-11 Prakash Kumbhakar , Shrey Srivastava , Haroon R Lone

Federated learning (FL) emerges as a decentralized learning framework which trains models from multiple distributed clients without sharing their data to preserve privacy. Recently, large-scale pre-trained models (e.g., Vision Transformer)…

Computer Vision and Pattern Recognition · Computer Science 2023-08-30 Fu-En Yang , Chien-Yi Wang , Yu-Chiang Frank Wang

In federated learning, clients share a global model that has been trained on decentralized local client data. Although federated learning shows significant promise as a key approach when data cannot be shared or centralized, current methods…

Machine Learning · Computer Science 2021-02-09 Edvin Listo Zec , Olof Mogren , John Martinsson , Leon René Sütfeld , Daniel Gillblad

Providing model-generated explanations in recommender systems is important to user experience. State-of-the-art recommendation algorithms - especially collaborative filtering (CF)-based approaches with shallow or deep models - usually work…

Information Retrieval · Computer Science 2019-01-23 Qingyao Ai , Vahid Azizi , Xu Chen , Yongfeng Zhang

Retrieval-Augmented Generation (RAG) has recently emerged as a promising solution for enhancing the accuracy and credibility of Large Language Models (LLMs), particularly in Question & Answer tasks. This is achieved by incorporating…

Computation and Language · Computer Science 2025-04-29 Qianren Mao , Qili Zhang , Hanwen Hao , Zhentao Han , Runhua Xu , Weifeng Jiang , Qi Hu , Zhijun Chen , Tyler Zhou , Bo Li , Yangqiu Song , Jin Dong , Jianxin Li , Philip S. Yu

Cross-domain Sequential Recommendation (CSR) which leverages user sequence data from multiple domains has received extensive attention in recent years. However, the existing CSR methods require sharing origin user data across domains, which…

Machine Learning · Computer Science 2024-04-26 Hongyu Zhang , Dongyi Zheng , Xu Yang , Jiyuan Feng , Qing Liao

Federated Learning (FL) confronts a significant challenge known as data heterogeneity, which impairs model performance and convergence. Existing methods have made notable progress in addressing this issue. However, improving performance in…

Machine Learning · Computer Science 2025-10-24 Zhiqin Yang , Yonggang Zhang , Chenxin Li , Yiu-ming Cheung , Bo Han , Yixuan Yuan

In healthcare, federated learning (FL) is a widely adopted framework that enables privacy-preserving collaboration among medical institutions. With large foundation models (FMs) demonstrating impressive capabilities, using FMs in FL through…

Machine Learning · Computer Science 2025-08-15 Danni Peng , Yuan Wang , Kangning Cai , Peiyan Ning , Jiming Xu , Yong Liu , Rick Siow Mong Goh , Qingsong Wei , Huazhu Fu