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Federated recommendation aims to collect global knowledge by aggregating local models from massive devices, to provide recommendations while ensuring privacy. Current methods mainly leverage aggregation functions invented by federated…

Cryptography and Security · Computer Science 2024-06-07 Honglei Zhang , Haoxuan Li , Jundong Chen , Sen Cui , Kunda Yan , Abudukelimu Wuerkaixi , Xin Zhou , Zhiqi Shen , Yidong Li

Personalized decision-making can be implemented in a Federated learning (FL) framework that can collaboratively train a decision model by extracting knowledge across intelligent clients, e.g. smartphones or enterprises. FL can mitigate the…

Machine Learning · Computer Science 2023-02-01 Guodong Long , Ming Xie , Tao Shen , Tianyi Zhou , Xianzhi Wang , Jing Jiang , Chengqi Zhang

Federated learning is a decentralized and privacy-preserving technique that enables multiple clients to collaborate with a server to learn a global model without exposing their private data. However, the presence of statistical…

Machine Learning · Computer Science 2023-07-06 Shiyu Liu , Shaogao Lv , Dun Zeng , Zenglin Xu , Hui Wang , Yue Yu

Federated learning (FL) enables distributed training with private client data, but its convergence is hindered by system heterogeneity under realistic communication scenarios. Most FL schemes addressing system heterogeneity utilize global…

Machine Learning · Computer Science 2025-09-19 Keumseo Ryum , Jinu Gong , Joonhyuk Kang

Federated recommendation applies federated learning techniques in recommendation systems to help protect user privacy by exchanging models instead of raw user data between user devices and the central server. Due to the heterogeneity in…

Information Retrieval · Computer Science 2022-08-22 Sichun Luo , Yuanzhang Xiao , Linqi Song

Federated learning enables distributed clients to collaborate on training while storing their data locally to protect client privacy. However, due to the heterogeneity of data, models, and devices, the final global model may need to perform…

Machine Learning · Computer Science 2024-06-25 Wolong Xing , Zhenkui Shi , Hongyan Peng , Xiantao Hu , Xianxian Li

In the context of personalized federated learning (FL), the critical challenge is to balance local model improvement and global model tuning when the personal and global objectives may not be exactly aligned. Inspired by Bayesian…

Machine Learning · Computer Science 2022-04-19 Huili Chen , Jie Ding , Eric Tramel , Shuang Wu , Anit Kumar Sahu , Salman Avestimehr , Tao Zhang

Federated Learning(FL) is popular as a privacy-preserving machine learning paradigm for generating a single model on decentralized data. However, statistical heterogeneity poses a significant challenge for FL. As a subfield of FL,…

Machine Learning · Computer Science 2024-10-22 Keting Yin , Jiayi Mao

Owing to the nature of privacy protection, federated recommender systems (FedRecs) have garnered increasing interest in the realm of on-device recommender systems. However, most existing FedRecs only allow participating clients to…

Information Retrieval · Computer Science 2023-12-06 Wei Yuan , Liang Qu , Lizhen Cui , Yongxin Tong , Xiaofang Zhou , Hongzhi Yin

Federated learning (FL) enables collaboratively training deep learning models on decentralized data. However, there are three types of heterogeneities in FL setting bringing about distinctive challenges to the canonical federated learning…

Machine Learning · Computer Science 2020-09-18 Tao Shen , Jie Zhang , Xinkang Jia , Fengda Zhang , Gang Huang , Pan Zhou , Kun Kuang , Fei Wu , Chao Wu

Federated learning (FL) is increasingly adopted in domains like healthcare, where data privacy is paramount. A fundamental challenge in these systems is statistical heterogeneity-the fact that data distributions vary significantly across…

Machine Learning · Computer Science 2026-02-12 Zijian Wang , Xiaofei Zhang , Xin Zhang , Yukun Liu , Qiong Zhang

Federated Learning provides a privacy-preserving paradigm for distributed learning, but suffers from statistical heterogeneity across clients. Personalized Federated Learning (PFL) mitigates this issue by considering client-specific models.…

Machine Learning · Statistics 2026-02-17 Ala Emrani , Amir Najafi , Abolfazl Motahari

The federated learning (FL) paradigm emerges to preserve data privacy during model training by only exposing clients' model parameters rather than original data. One of the biggest challenges in FL lies in the non-IID (not identical and…

Machine Learning · Computer Science 2023-05-26 Jiahao Tan , Yipeng Zhou , Gang Liu , Jessie Hui Wang , Shui Yu

Federated Learning (FL) is a privacy-preserving machine learning framework facilitating collaborative training across distributed clients. However, its performance is often compromised by data heterogeneity among participants, which can…

Machine Learning · Computer Science 2026-02-16 Ziru Niu , Hai Dong , A. K. Qin

Federated recommendations leverage the federated learning (FL) techniques to make privacy-preserving recommendations. Though recent success in the federated recommender system, several vital challenges remain to be addressed: (i) The…

Information Retrieval · Computer Science 2022-08-25 Sichun Luo , Yuanzhang Xiao , Yang Liu , Congduan Li , Linqi Song

Data heterogeneity poses a fundamental challenge in federated learning (FL), especially when clients differ not only in distribution but also in the reliability of their predictions across individual examples. While personalized FL (PFL)…

Machine Learning · Computer Science 2025-09-29 Amr Abourayya , Jens Kleesiek , Bharat Rao , Michael Kamp

Centralized recommender systems encounter privacy leakage due to the need to collect user behavior and other private data. Hence, federated recommender systems (FedRec) have become a promising approach with an aggregated global model on the…

Information Retrieval · Computer Science 2025-08-28 Jiakui Shen , Yunqi Mi , Guoshuai Zhao , Jialie Shen , Xueming Qian

Federated recommendation (FR) is a promising paradigm to protect user privacy in recommender systems. Distinct from general federated scenarios, FR inherently needs to preserve client-specific parameters, i.e., user embeddings, for privacy…

Cryptography and Security · Computer Science 2025-06-12 Jundong Chen , Honglei Zhang , Haoxuan Li , Chunxu Zhang , Zhiwei Li , Yidong Li

Federated learning (FL) is an appealing paradigm that allows a group of machines (a.k.a. clients) to learn collectively while keeping their data local. However, due to the heterogeneity between the clients' data distributions, the model…

Machine Learning · Computer Science 2024-10-01 Youssef Allouah , Abdellah El Mrini , Rachid Guerraoui , Nirupam Gupta , Rafael Pinot

One global model in federated learning (FL) might not be sufficient to serve many clients with non-IID tasks and distributions. While there has been advances in FL to train multiple global models for better personalization, they only…

Machine Learning · Computer Science 2026-02-19 Shutong Chen , Tianyi Zhou , Guodong Long , Jing Jiang , Chengqi Zhang
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