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Federated Learning (FL) under distributed concept drift is a largely unexplored area. Although concept drift is itself a well-studied phenomenon, it poses particular challenges for FL, because drifts arise staggered in time and space…

Machine Learning · Computer Science 2023-03-01 Ellango Jothimurugesan , Kevin Hsieh , Jianyu Wang , Gauri Joshi , Phillip B. Gibbons

Data heterogeneity is one of the key challenges in federated learning, and many efforts have been devoted to tackling this problem. However, distributed concept drift with data heterogeneity, where clients may additionally experience…

Machine Learning · Computer Science 2024-10-25 Junbao Chen , Jingfeng Xue , Yong Wang , Zhenyan Liu , Lu Huang

Federated learning (FL) involves multiple distributed devices jointly training a shared model without any of the participants having to reveal their local data to a centralized server. Most of previous FL approaches assume that data on…

Machine Learning · Computer Science 2021-09-02 Yujing Chen , Zheng Chai , Yue Cheng , Huzefa Rangwala

Federated Learning (FL) trains deep models across edge devices without centralizing raw data, preserving user privacy. However, client heterogeneity slows down convergence and limits global model accuracy. Clustered FL (CFL) mitigates this…

Machine Learning · Computer Science 2026-02-10 Minghao Li , Dmitrii Avdiukhin , Rana Shahout , Nikita Ivkin , Vladimir Braverman , Minlan Yu

Federated Learning (FL) suffers from severe performance degradation due to the data heterogeneity among clients. Existing works reveal that the fundamental reason is that data heterogeneity can cause client drift where the local model…

Machine Learning · Computer Science 2025-01-22 Haoran Xu , Jiaze Li , Wanyi Wu , Hao Ren

Federated Learning (FL) is a machine learning paradigm that safeguards privacy by retaining client data on edge devices. However, optimizing FL in practice can be challenging due to the diverse and heterogeneous nature of the learning…

Machine Learning · Computer Science 2024-06-11 Yongxin Guo , Xiaoying Tang , Tao Lin

Federated Learning (FL) enables decentralized model training across clients without sharing raw data, but its performance degrades under real-world data heterogeneity. Existing methods often fail to address distribution shift across clients…

Machine Learning · Computer Science 2026-02-10 Mohan Li , Dario Fenoglio , Martin Gjoreski , Marc Langheinrich

In Federated Learning (FL), a number of clients or devices collaborate to train a model without sharing their data. Models are optimized locally at each client and further communicated to a central hub for aggregation. While FL is an…

Machine Learning · Computer Science 2023-07-25 Farshid Varno , Marzie Saghayi , Laya Rafiee Sevyeri , Sharut Gupta , Stan Matwin , Mohammad Havaei

Federated learning (FL) enables collaborative training of a global model in the centralized server with data from multiple parties while preserving privacy. However, data heterogeneity can significantly degrade the performance of the global…

Machine Learning · Computer Science 2025-11-11 Yong Zhang , Feng Liang , Guanghu Yuan , Min Yang , Chengming Li , Xiping Hu

The performance of Federated Learning (FL) hinges on the effectiveness of utilizing knowledge from distributed datasets. Traditional FL methods adopt an aggregate-then-adapt framework, where clients update local models based on a global…

Computer Vision and Pattern Recognition · Computer Science 2024-05-01 Yuan Wang , Huazhu Fu , Renuga Kanagavelu , Qingsong Wei , Yong Liu , Rick Siow Mong Goh

Smart devices, such as smartphones, wearables, robots, and others, can collect vast amounts of data from their environment. This data is suitable for training machine learning models, which can significantly improve their behavior, and…

Machine Learning · Computer Science 2021-07-16 Fernando E. Casado , Dylan Lema , Marcos F. Criado , Roberto Iglesias , Carlos V. Regueiro , Senén Barro

Federated learning shows promise as a privacy-preserving collaborative learning technique. Existing heterogeneous federated learning mainly focuses on skewing the label distribution across clients. However, most approaches suffer from…

Machine Learning · Computer Science 2023-12-18 Shunxin Guo , Hongsong Wang , Xin Geng

Federated Learning (FL) marks a transformative approach to distributed model training by combining locally optimized models from various clients into a unified global model. While FL preserves data privacy by eliminating centralized…

Machine Learning · Computer Science 2026-01-08 Pranab Sahoo , Ashutosh Tripathi , Sriparna Saha , Samrat Mondal

Federated learning (FL) is an emerging distributed machine learning paradigm that enables collaborative training of machine learning models over decentralized devices without exposing their local data. One of the major challenges in FL is…

Distributed, Parallel, and Cluster Computing · Computer Science 2024-07-11 Md Sirajul Islam , Simin Javaherian , Fei Xu , Xu Yuan , Li Chen , Nian-Feng Tzeng

Federated learning (FL) is a machine learning paradigm that allows multiple clients to collaboratively train a shared model without exposing their private data. Data heterogeneity is a fundamental challenge in FL, which can result in poor…

Machine Learning · Computer Science 2025-08-21 Tao Shen , Zexi Li , Didi Zhu , Ziyu Zhao , Chao Wu , Fei Wu

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

Federated Learning (FL) aims to learn a single global model that enables the central server to help the model training in local clients without accessing their local data. The key challenge of FL is the heterogeneity of local data in…

Machine Learning · Computer Science 2023-04-17 Sicong Liang , Junchao Tian , Shujun Yang , Yu Zhang

Federated Learning (FL) is an emerging domain in the broader context of artificial intelligence research. Methodologies pertaining to FL assume distributed model training, consisting of a collection of clients and a server, with the main…

Machine Learning · Computer Science 2023-05-09 Bhargav Ganguly , Vaneet Aggarwal

Federated learning (FL) under data heterogeneity remains challenging: existing methods either ignore client differences (FedAvg), require costly cluster discovery (IFCA), or maintain per-client models (Ditto). All degrade when data is…

Machine Learning · Computer Science 2026-05-06 Rickard Brännvall

Federated learning (FL) supports distributed training of a global machine learning model across multiple devices with the help of a central server. However, data heterogeneity across different devices leads to the client model drift issue…

Machine Learning · Computer Science 2023-10-06 Xu Zhou , Xinyu Lei , Cong Yang , Yichun Shi , Xiao Zhang , Jingwen Shi
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