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Federated Learning (FL) presents an innovative approach to privacy-preserving distributed machine learning and enables efficient crowd intelligence on a large scale. However, a significant challenge arises when coordinating FL with crowd…

Distributed, Parallel, and Cluster Computing · Computer Science 2023-09-06 Yuhao Zhou , Minjia Shi , Yuxin Tian , Yuanxi Li , Qing Ye , Jiancheng Lv

Data heterogeneity across clients is one of the key challenges in Federated Learning (FL), which may slow down the global model convergence and even weaken global model performance. Most existing approaches tackle the heterogeneity by…

Machine Learning · Computer Science 2023-07-18 Jun Nie , Danyang Xiao , Lei Yang , Weigang Wu

Learning from distributed data without accessing them is undoubtedly a challenging and non-trivial task. Nevertheless, the necessity for distributed training of a statistical model has been increasing, due to the privacy concerns of local…

Machine Learning · Statistics 2024-08-02 Seok-Ju Hahn

Federated Learning (FL) enables collaborative training across multiple clients while preserving data privacy, yet it struggles with data heterogeneity, where clients' data are not distributed independently and identically (non-IID). This…

Machine Learning · Computer Science 2025-12-16 Incheol Baek , Hyungbin Kim , Minseo Kim , Yon Dohn Chung

Federated Learning (FL) seeks to distribute model training across local clients without collecting data in a centralized data-center, hence removing data-privacy concerns. A major challenge for FL is data heterogeneity (where each client's…

Machine Learning · Computer Science 2022-09-22 Junjiao Tian , James Seale Smith , Zsolt Kira

Heterogeneity in federated learning (FL) is a critical and challenging aspect that significantly impacts model performance and convergence. In this paper, we propose a novel framework by formulating heterogeneous FL as a hierarchical…

Optimization and Control · Mathematics 2025-09-11 Yuyang Qiu , Kibaek Kim , Farzad Yousefian

Federated learning (FL) is an emerging machine learning paradigm in which a central server coordinates multiple participants (clients) collaboratively to train on decentralized data. In practice, FL often faces statistical, system, and…

Machine Learning · Computer Science 2024-02-13 Liping Yi , Han Yu , Gang Wang , Xiaoguang Liu , Xiaoxiao Li

Federated Learning (FL) provides decentralised model training, which effectively tackles problems such as distributed data and privacy preservation. However, the generalisation of global models frequently faces challenges from data…

Machine Learning · Computer Science 2025-09-05 Ozgu Goksu , Nicolas Pugeault

We present a partially personalized formulation of Federated Learning (FL) that strikes a balance between the flexibility of personalization and cooperativeness of global training. In our framework, we split the variables into global…

Machine Learning · Computer Science 2023-05-30 Konstantin Mishchenko , Rustem Islamov , Eduard Gorbunov , Samuel Horváth

One of the main challenges of federated learning (FL) is handling non-independent and identically distributed (non-IID) client data, which may occur in practice due to unbalanced datasets and use of different data sources across clients.…

Machine Learning · Computer Science 2024-10-23 Peng Wu , Tales Imbiriba , Pau Closas

Federated learning (FL) is an appealing concept to perform distributed training of Neural Networks (NN) while keeping data private. With the industrialization of the FL framework, we identify several problems hampering its successful…

Machine Learning · Computer Science 2020-11-13 Lixuan Yang , Cedric Beliard , Dario Rossi

Federated Learning (FL) enables decentralised model training across distributed clients without requiring data centralisation. However, the generalisation performance of the global model is usually degraded by data heterogeneity across…

Machine Learning · Computer Science 2026-05-11 Ozgu Goksu , Nicolas Pugeault

Statistical heterogeneity across clients in a Federated Learning (FL) system increases the algorithm convergence time and reduces the generalization performance, resulting in a large communication overhead in return for a poor model. To…

Machine Learning · Computer Science 2023-04-26 Mohamad Mestoukirdi , Matteo Zecchin , David Gesbert , Qianrui Li

Federated learning enables different parties to collaboratively build a global model under the orchestration of a server while keeping the training data on clients' devices. However, performance is affected when clients have heterogeneous…

Machine Learning · Computer Science 2022-06-20 Fabiola Espinoza Castellon , Aurelien Mayoue , Jacques-Henri Sublemontier , Cedric Gouy-Pailler

Federated learning (FL) enables retailers to share model parameters for demand forecasting while maintaining privacy. However, heterogeneous data across diverse regions, driven by factors such as varying consumer behavior, poses challenges…

Machine Learning · Computer Science 2025-03-24 Yunbo Long , Liming Xu , Ge Zheng , Alexandra Brintrup

Federated Learning (FL) enables privacy-preserving collaborative model training, but its effectiveness is often limited by client data heterogeneity. We introduce a client-selection algorithm that (i) dynamically forms nonoverlapping…

Machine Learning · Computer Science 2025-10-16 Alessandro Licciardi , Roberta Raineri , Anton Proskurnikov , Lamberto Rondoni , Lorenzo Zino

With the rapid development of the Internet of Things (IoT), AI model training on private data such as human sensing data is highly desired. Federated learning (FL) has emerged as a privacy-preserving distributed training framework for this…

Machine Learning · Computer Science 2026-01-27 Kaile Wang , Jiannong Cao , Yu Yang , Xiaoyin Li , Yinfeng Cao

Federated learning (FL) is a well established method for performing machine learning tasks over massively distributed data. However in settings where data is distributed in a non-iid (not independent and identically distributed) fashion --…

Machine Learning · Computer Science 2020-05-07 Christopher Briggs , Zhong Fan , Peter Andras

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) has emerged as a promising distributed learning paradigm that enables multiple clients to learn a global model collaboratively without sharing their private data. However, the effectiveness of FL is highly dependent…

Machine Learning · Computer Science 2023-12-27 Zhongyi Cai , Ye Shi , Wei Huang , Jingya Wang