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Federated active learning (FAL) seeks to reduce annotation cost under privacy constraints, yet its effectiveness degrades in realistic settings with severe global class imbalance and highly heterogeneous clients. We conduct a systematic…

Machine Learning · Computer Science 2026-03-12 Chen-Chen Zong , Sheng-Jun Huang

Federated Learning (FL) has emerged as a powerful paradigm for decentralized machine learning, enabling collaborative model training across diverse clients without sharing raw data. However, traditional FL approaches often face limitations…

Machine Learning · Computer Science 2025-10-22 Ali Forootani , Raffaele Iervolino

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) has emerged as a potent framework for training models across distributed data sources while maintaining data privacy. Nevertheless, it faces challenges with limited high-quality labels and non-IID client data,…

Computer Vision and Pattern Recognition · Computer Science 2024-01-04 Taehyeon Kim , Eric Lin , Junu Lee , Christian Lau , Vaikkunth Mugunthan

In this letter, we design a federated contrastive learning (FedCL) framework aimed at supporting personalized semantic communication. Our FedCL enables collaborative training of local semantic encoders across multiple clients and a global…

Signal Processing · Electrical Eng. & Systems 2024-06-14 Yining Wang , Wanli Ni , Wenqiang Yi , Xiaodong Xu , Ping Zhang , Arumugam Nallanathan

Federated Learning (FL) aims at unburdening the training of deep models by distributing computation across multiple devices (clients) while safeguarding data privacy. On top of that, Federated Continual Learning (FCL) also accounts for data…

Machine Learning · Computer Science 2025-05-27 Riccardo Salami , Pietro Buzzega , Matteo Mosconi , Mattia Verasani , Simone Calderara

Knowledge sharing and model personalization are essential components to tackle the non-IID challenge in federated learning (FL). Most existing FL methods focus on two extremes: 1) to learn a shared model to serve all clients with non-IID…

Machine Learning · Computer Science 2022-06-08 Jie Ma , Guodong Long , Tianyi Zhou , Jing Jiang , Chengqi Zhang

Data heterogeneity is one of the most challenging issues in federated learning, which motivates a variety of approaches to learn personalized models for participating clients. One such approach in deep neural networks based tasks is…

Machine Learning · Computer Science 2023-06-22 Jian Xu , Xinyi Tong , Shao-Lun Huang

Federated learning is an efficient framework designed to facilitate collaborative model training across multiple distributed devices while preserving user data privacy. A significant challenge of federated learning is data-level…

Machine Learning · Computer Science 2024-08-26 Shunxin Guo , Hongsong Wang , Shuxia Lin , Zhiqiang Kou , Xin Geng

While deep learning models like Vision Transformer (ViT) have achieved significant advances, they typically require large datasets. With data privacy regulations, access to many original datasets is restricted, especially medical images.…

Computer Vision and Pattern Recognition · Computer Science 2026-02-03 Xinyuan Zhao , Yihang Wu , Ahmad Chaddad , Tareef Daqqaq , Reem Kateb

Federated learning (FL) is a machine learning approach where nodes collaboratively train a global model. As more nodes participate in a round of FL, the effectiveness of individual model updates by nodes also diminishes. In this study, we…

Machine Learning · Computer Science 2025-03-12 Akash Dhasade , Anne-Marie Kermarrec , Tuan-Anh Nguyen , Rafael Pires , Martijn de Vos

Federated learning (FL) enables collaborative machine learning across distributed data owners, but data heterogeneity poses a challenge for model calibration. While prior work focused on improving accuracy for non-iid data, calibration…

Machine Learning · Computer Science 2024-06-05 Hongyi Peng , Han Yu , Xiaoli Tang , Xiaoxiao Li

Over recent years, Federated Learning (FL) has proven to be one of the most promising methods of distributed learning which preserves data privacy. As the method evolved and was confronted to various real-world scenarios, new challenges…

Machine Learning · Statistics 2024-11-15 Michael Ben Ali , Omar El-Rifai , Imen Megdiche , André Peninou , Olivier Teste

The enormous amount of data produced by mobile and IoT devices has motivated the development of federated learning (FL), a framework allowing such devices (or clients) to collaboratively train machine learning models without sharing their…

Machine Learning · Computer Science 2023-01-12 Angelo Rodio , Francescomaria Faticanti , Othmane Marfoq , Giovanni Neglia , Emilio Leonardi

Federated learning is an important privacy-preserving multi-party learning paradigm, involving collaborative learning with others and local updating on private data. Model heterogeneity and catastrophic forgetting are two crucial…

Machine Learning · Computer Science 2023-09-29 Wenke Huang , Mang Ye , Zekun Shi , Bo Du

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

Federated learning (FL) is an emerging technique that trains massive and geographically distributed edge data while maintaining privacy. However, FL has inherent challenges in terms of fairness and computational efficiency due to the rising…

Machine Learning · Computer Science 2023-04-28 Yingchun Wang , Jingcai Guo , Jie Zhang , Song Guo , Weizhan Zhang , Qinghua Zheng

Federated learning (FL) is a distributed framework for collaboratively training with privacy guarantees. In real-world scenarios, clients may have Non-IID data (local class imbalance) with poor annotation quality (label noise). The…

Machine Learning · Computer Science 2023-04-07 Chenrui Wu , Zexi Li , Fangxin Wang , Chao Wu

Federated Learning (FL) enables collaborative model training across decentralized devices while preserving data privacy. However, real-world FL deployments face critical challenges such as data imbalances, including label noise and non-IID…

Machine Learning · Computer Science 2026-01-13 Siqi Zhu , Joshua D. Kaggie

Achieving fairness across diverse clients in Federated Learning (FL) remains a significant challenge due to the heterogeneity of the data and the inaccessibility of sensitive attributes from clients' private datasets. This study addresses…

Machine Learning · Computer Science 2024-06-26 Disha Makhija , Xing Han , Joydeep Ghosh , Yejin Kim