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As data privacy and security attract increasing attention, Federated Recommender System (FRS) offers a solution that strikes a balance between providing high-quality recommendations and preserving user privacy. However, the presence of…

Information Retrieval · Computer Science 2024-11-05 Xinrui He , Shuo Liu , Jackey Keung , Jingrui He

The increasing emphasis on privacy in recommendation systems has led to the adoption of Federated Learning (FL) as a privacy-preserving solution, enabling collaborative training without sharing user data. While Federated Recommendation…

Machine Learning · Computer Science 2025-08-19 Jaehyung Lim , Wonbin Kweon , Woojoo Kim , Junyoung Kim , Seongjin Choi , Dongha Kim , Hwanjo Yu

Large Language Models (LLMs) have empowered generative recommendation systems through fine-tuning user behavior data. However, utilizing the user data may pose significant privacy risks, potentially leading to ethical dilemmas and…

Information Retrieval · Computer Science 2025-02-25 Jujia Zhao , Wenjie Wang , Chen Xu , See-Kiong Ng , Tat-Seng Chua

Preserving privacy and reducing communication costs for edge users pose significant challenges in recommendation systems. Although federated learning has proven effective in protecting privacy by avoiding data exchange between clients and…

Machine Learning · Computer Science 2023-11-01 Lin Wang , Zhichao Wang , Xi Leng , Xiaoying Tang

Sequential recommendation is dedicated to offering items of interest for users based on their history behaviors. The attribute-opinion pairs, expressed by users in their reviews for items, provide the potentials to capture user preferences…

Information Retrieval · Computer Science 2024-04-22 Xiaokun Zhang , Bo Xu , Youlin Wu , Yuan Zhong , Hongfei Lin , Fenglong Ma

Federated recommendation systems (FedRecs) have gained significant attention for providing privacy-preserving recommendation services. However, existing FedRecs assume that all users have the same requirements for privacy protection, i.e.,…

Machine Learning · Computer Science 2025-08-11 Ce Na , Kai Yang , Dengzhao Fang , Yu Li , Jingtong Gao , Chengcheng Zhu , Jiale Zhang , Xiaobing Sun , Yi Chang

Federated Recommendation (FedRec) has emerged as a key paradigm for building privacy-preserving recommender systems. However, existing FedRec models face a critical dilemma: memory-efficient single-knowledge models suffer from a suboptimal…

Information Retrieval · Computer Science 2025-11-19 Jaehyung Lim , Wonbin Kweon , Woojoo Kim , Junyoung Kim , Dongha Kim , Hwanjo Yu

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

A standard approach to Collaborative Filtering (CF), i.e. prediction of user ratings on items, relies on Matrix Factorization techniques. Representations for both users and items are computed from the observed ratings and used for…

Information Retrieval · Computer Science 2015-06-23 Gabriella Contardo , Ludovic Denoyer , Thierry Artieres

News recommendation is critical for personalized news access. Most existing news recommendation methods rely on centralized storage of users' historical news click behavior data, which may lead to privacy concerns and hazards. Federated…

Information Retrieval · Computer Science 2023-05-31 Jingwei Yi , Fangzhao Wu , Chuhan Wu , Ruixuan Liu , Guangzhong Sun , Xing Xie

Federated learning is a privacy-preserving machine learning technique that learns a shared model across decentralized clients. It can alleviate privacy concerns of personal re-identification, an important computer vision task. In this work,…

Computer Vision and Pattern Recognition · Computer Science 2020-10-12 Weiming Zhuang , Yonggang Wen , Xuesen Zhang , Xin Gan , Daiying Yin , Dongzhan Zhou , Shuai Zhang , Shuai Yi

Personalized federated recommendation system (FedRec) has gained significant attention for its ability to preserve privacy in delivering tailored recommendations. To alleviate the statistical heterogeneity challenges among clients and…

Information Retrieval · Computer Science 2025-09-30 Yunqi Mi , Boyang Yan , Guoshuai Zhao , Jialie Shen , Xueming Qian

Privacy-preserving recommendations are recently gaining momentum, since the decentralized user data is increasingly harder to collect, by recommendation service providers, due to the serious concerns over user privacy and data security.…

Information Retrieval · Computer Science 2020-08-26 Mingkai Huang , Hao Li , Bing Bai , Chang Wang , Kun Bai , Fei Wang

Federated Learning (FL) is gaining prominence in machine learning as privacy concerns grow. This paradigm allows each client (e.g., an individual online store) to train a recommendation model locally while sharing only model updates,…

Machine Learning · Computer Science 2025-10-09 Jongwon Park , Minku Kang , Wooseok Sim , Soyoung Lee , Hogun Park

Federated recommendation provides a privacy-preserving solution for training recommender systems without centralizing user interactions. However, existing methods follow an ID-indexed communication paradigm that transmit whole item…

Information Retrieval · Computer Science 2026-01-27 Mingzhe Han , Jiahao Liu , Dongsheng Li , Hansu Gu , Peng Zhang , Ning Gu , Tun Lu

Federated recommendations (FRs) provide personalized services while preserving user privacy by keeping user data on local clients, which has attracted significant attention in recent years. However, due to the strict privacy constraints…

Information Retrieval · Computer Science 2026-01-01 Kang Fu , Honglei Zhang , Xuechao Zou , Yidong Li

Federated recommender systems (FedRS) have emerged as a paradigm for protecting user privacy by keeping interaction data on local devices while coordinating model training through a central server. However, most existing federated…

Information Retrieval · Computer Science 2026-03-13 Liang Qu , Jianxin Li , Wei Yuan , Shangfei Zheng , Lu Chen , Chengfei Liu , Hongzhi Yin

Federated recommendation (FR) facilitates collaborative training by aggregating local models from massive devices, enabling client-specific personalization while ensuring privacy. However, we empirically and theoretically demonstrate that…

Distributed, Parallel, and Cluster Computing · Computer Science 2025-08-19 Jundong Chen , Honglei Zhang , Chunxu Zhang , Fangyuan Luo , Yidong Li

The cold-start problem is quite challenging for existing recommendation models. Specifically, for the new items with only a few interactions, their ID embeddings are trained inadequately, leading to poor recommendation performance. Some…

Information Retrieval · Computer Science 2023-06-09 Haonan Hu , Dazhong Rong , Jianhai Chen , Qinming He , Zhenguang Liu

Recommender systems play a pivotal role across practical scenarios, showcasing remarkable capabilities in user preference modeling. However, the centralized learning paradigm predominantly used raises serious privacy concerns. The federated…

Information Retrieval · Computer Science 2024-11-05 Langming Liu , Wanyu Wang , Xiangyu Zhao , Zijian Zhang , Chunxu Zhang , Shanru Lin , Yiqi Wang , Lixin Zou , Zitao Liu , Xuetao Wei , Hongzhi Yin , Qing Li