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Federated learning is an emerging distributed machine learning framework aiming at protecting data privacy. Data heterogeneity is one of the core challenges in federated learning, which could severely degrade the convergence rate and…

Machine Learning · Statistics 2025-11-27 Feifei Wang , Huiyun Tang , Yang Li

The heterogeneous information network (HIN), which contains rich semantics depicted by meta-paths, has emerged as a potent tool for mitigating data sparsity in recommender systems. Existing HIN-based recommender systems operate under the…

Machine Learning · Computer Science 2024-02-29 Bo Yan , Yang Cao , Haoyu Wang , Wenchuan Yang , Junping Du , Chuan Shi

Federated Learning (FL) deals with learning a central model (i.e. the server) in privacy-constrained scenarios, where data are stored on multiple devices (i.e. the clients). The central model has no direct access to the data, but only to…

Machine Learning · Computer Science 2021-05-03 Debora Caldarola , Massimiliano Mancini , Fabio Galasso , Marco Ciccone , Emanuele Rodolà , Barbara Caputo

Federated representation learning (FRL) aims to learn personalized federated models with effective feature extraction from local data. FRL algorithms that share the majority of the model parameters face significant challenges with huge…

Machine Learning · Computer Science 2024-10-15 Haolin Yu , Guojun Zhang , Pascal Poupart

Federated learning is a distributed machine learning approach in which a single server and multiple clients collaboratively build machine learning models without sharing datasets on clients. A challenging issue of federated learning is data…

Machine Learning · Computer Science 2022-06-28 Koji Matsuda , Yuya Sasaki , Chuan Xiao , Makoto Onizuka

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

Federated learning is a distributed, on-device computation framework that enables training global models without exporting sensitive user data to servers. In this work, we describe methods to extend the federation framework to evaluate…

Machine Learning · Computer Science 2019-10-24 Kangkang Wang , Rajiv Mathews , Chloé Kiddon , Hubert Eichner , Françoise Beaufays , Daniel Ramage

Graph neural networks (GNNs) have gained wide popularity in recommender systems due to their capability to capture higher-order structure information among the nodes of users and items. However, these methods need to collect personal…

Information Retrieval · Computer Science 2023-08-03 Guowei Wu , Weike Pan , Zhong Ming

Federated learning enables joint training of machine learning models from distributed clients without sharing their local data. One key challenge in federated learning is to handle non-identically distributed data across the clients, which…

Machine Learning · Computer Science 2023-12-25 Tiejin Chen , Yuanpu Cao , Yujia Wang , Cho-Jui Hsieh , Jinghui Chen

Federated learning is a distributed machine learning paradigm designed to protect data privacy. However, data heterogeneity across various clients results in catastrophic forgetting, where the model rapidly forgets previous knowledge while…

Machine Learning · Computer Science 2024-11-07 Pengju Wang , Bochao Liu , Weijia Guo , Yong Li , Shiming Ge

Statistical heterogeneity in Federated Learning (FL) often leads to negative transfer, where a single global model fails to serve diverse client distributions. Personalized federated learning (pFL) aims to address this by tailoring models…

Machine Learning · Computer Science 2026-03-31 Brianna Mueller , W. Nick Street

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 Learning (FL) has emerged as a promising technique for training language models on distributed and private datasets of diverse tasks. However, aggregating models trained on heterogeneous tasks often degrades the overall…

Machine Learning · Computer Science 2026-04-07 Gabriel U. Talasso , Meghdad Kurmanji , Allan M. de Souza , Nicholas D. Lane , Leandro A. Villas

We propose a parametric family of algorithms for personalized federated learning with locally convex user costs. The proposed framework is based on a generalization of convex clustering in which the differences between different users'…

Machine Learning · Computer Science 2022-02-21 Aleksandar Armacki , Dragana Bajovic , Dusan Jakovetic , Soummya Kar

Federated learning is a distributed machine learning technology, which realizes the balance between data privacy protection and data sharing computing. To protect data privacy, feder-ated learning learns shared models by locally executing…

Machine Learning · Computer Science 2023-06-26 Tianyu Zhao , Junping Du , Yingxia Shao , Zeli Guan

In this paper, we propose a method for privacy-preserving federated learning that uses randomly selected model parameters to update global models. High-quality deep neural networks (DNN) models require a huge amount of training data in…

Cryptography and Security · Computer Science 2026-05-05 Hiroto Sawada , Shoko Imaizumi , Hitoshi Kiya

As a popular paradigm of distributed learning, personalized federated learning (PFL) allows personalized models to improve generalization ability and robustness by utilizing knowledge from all distributed clients. Most existing PFL…

Machine Learning · Computer Science 2023-03-16 Guanghao Li , Wansen Wu , Yan Sun , Li Shen , Baoyuan Wu , Dacheng Tao

Personalized federated learning aims to address data heterogeneity across local clients in federated learning. However, current methods blindly incorporate either full model parameters or predefined partial parameters in personalized…

Machine Learning · Computer Science 2024-01-17 Kexin Lv , Rui Ye , Xiaolin Huang , Jie Yang , Siheng Chen

Collecting and training over sensitive personal data raise severe privacy concerns in personalized recommendation systems, and federated learning can potentially alleviate the problem by training models over decentralized user data.However,…

Information Retrieval · Computer Science 2022-12-15 Ruixuan Liu , Yanlin Wang , Yang Cao , Lingjuan Lyu , Weike Pan , Yun Chen , Hong Chen

Collaborative filtering (CF) based recommender systems are typically trained based on personal interaction data (e.g., clicks and purchases) that could be naturally represented as ego graphs. However, most existing recommendation methods…

Machine Learning · Computer Science 2023-02-23 Liang Qu , Ningzhi Tang , Ruiqi Zheng , Quoc Viet Hung Nguyen , Zi Huang , Yuhui Shi , Hongzhi Yin