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Deep learning (DL) has been increasingly applied in medical imaging, however, it requires large amounts of data, which raises many challenges related to data privacy, storage, and transfer. Federated learning (FL) is a training paradigm…

Computer Vision and Pattern Recognition · Computer Science 2025-10-09 Jan Fiszer , Dominika Ciupek , Maciej Malawski

Federated Learning (FL) is an emerging paradigm in machine learning without exposing clients' raw data. In practical scenarios with numerous clients, encouraging fair and efficient client participation in federated learning is of utmost…

Machine Learning · Computer Science 2024-01-30 Simin Javaherian , Sanjeev Panta , Shelby Williams , Md Sirajul Islam , Li Chen

Federated Learning (FL) suffers significant performance degradation in real-world deployments characterized by moderate to extreme statistical heterogeneity (non-IID client data). While global aggregation strategies promote broad…

Machine Learning · Computer Science 2026-03-11 Prakash Kumbhakar , Shrey Srivastava , Haroon R Lone

Models trained in federated settings often suffer from degraded performances and fail at generalizing, especially when facing heterogeneous scenarios. In this work, we investigate such behavior through the lens of geometry of the loss and…

Machine Learning · Computer Science 2022-07-22 Debora Caldarola , Barbara Caputo , Marco Ciccone

Federated Learning (FL) for face recognition aggregates locally optimized models from individual clients to construct a generalized face recognition model. However, previous studies present two major challenges: insufficient incorporation…

Computer Vision and Pattern Recognition · Computer Science 2024-07-24 Hansol Kim , Hoyeol Choi , Youngjun Kwak

The emerging paradigm of federated learning (FL) strives to enable collaborative training of deep models on the network edge without centrally aggregating raw data and hence improving data privacy. In most cases, the assumption of…

Machine Learning · Computer Science 2021-05-12 Xiaoxiao Li , Meirui Jiang , Xiaofei Zhang , Michael Kamp , Qi Dou

Federated learning (FL) is a promising strategy for performing privacy-preserving, distributed learning with a network of clients (i.e., edge devices). However, the data distribution among clients is often non-IID in nature, making…

Machine Learning · Computer Science 2022-04-15 Matias Mendieta , Taojiannan Yang , Pu Wang , Minwoo Lee , Zhengming Ding , Chen Chen

Federated learning (FL) is a distributed learning technique that trains a shared model over distributed data in a privacy-preserving manner. Unfortunately, FL's performance degrades when there is (i) variability in client characteristics in…

Machine Learning · Computer Science 2021-10-28 Muhammad Tahir Munir , Muhammad Mustansar Saeed , Mahad Ali , Zafar Ayyub Qazi , Ihsan Ayyub Qazi

Federated Learning is emerging as a privacy-preserving model training approach in distributed edge applications. As such, most edge deployments are heterogeneous in nature i.e., their sensing capabilities and environments vary across…

Machine Learning · Computer Science 2024-07-15 Khotso Selialia , Yasra Chandio , Fatima M. Anwar

With increasing appealing to privacy issues in face recognition, federated learning has emerged as one of the most prevalent approaches to study the unconstrained face recognition problem with private decentralized data. However,…

Computer Vision and Pattern Recognition · Computer Science 2021-12-15 Yifan Niu , Weihong Deng

Federated learning (FL) has garnered considerable attention due to its privacy-preserving feature. Nonetheless, the lack of freedom in managing user data can lead to group fairness issues, where models are biased towards sensitive factors…

Machine Learning · Computer Science 2024-10-18 Gerry Windiarto Mohamad Dunda , Shenghui Song

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

Federated Learning (FL) is a privacy-enhancing technology for distributed ML. By training models locally and aggregating updates - a federation learns together, while bypassing centralised data collection. FL is increasingly popular in…

Machine Learning · Computer Science 2024-08-16 Oscar Dilley , Juan Marcelo Parra-Ullauri , Rasheed Hussain , Dimitra Simeonidou

Federated learning is a decentralized training approach that keeps data under stakeholder control while achieving superior performance over isolated training. While inter-institutional feature discrepancies pose a challenge in all federated…

Image and Video Processing · Electrical Eng. & Systems 2025-07-01 Vasilis Siomos , Jonathan Passerat-Palmbach , Giacomo Tarroni

Fairness has emerged as a critical problem in federated learning (FL). In this work, we identify a cause of unfairness in FL -- conflicting gradients with large differences in the magnitudes. To address this issue, we propose the federated…

Machine Learning · Computer Science 2021-06-17 Zheng Wang , Xiaoliang Fan , Jianzhong Qi , Chenglu Wen , Cheng Wang , Rongshan Yu

How to ensure fairness is an important topic in federated learning (FL). Recent studies have investigated how to reward clients based on their contribution (collaboration fairness), and how to achieve uniformity of performance across…

Machine Learning · Computer Science 2023-03-30 Meirui Jiang , Holger R Roth , Wenqi Li , Dong Yang , Can Zhao , Vishwesh Nath , Daguang Xu , Qi Dou , Ziyue Xu

Federated Learning (FL) enables decentralized training of machine learning models on distributed data while preserving privacy. However, in real-world FL settings, client data is often non-identically distributed and imbalanced, resulting…

Machine Learning · Computer Science 2025-09-18 Gergely D. Németh , Eros Fanì , Yeat Jeng Ng , Barbara Caputo , Miguel Ángel Lozano , Nuria Oliver , Novi Quadrianto

Federated learning (FL) is an important technique for learning models from decentralized data in a privacy-preserving way. Existing FL methods usually uniformly sample clients for local model learning in each round. However, different…

Machine Learning · Computer Science 2023-06-27 Tao Qi , Fangzhao Wu , Lingjuan Lyu , Yongfeng Huang , Xing Xie

Federated Learning (FL) enables training ML models on edge clients without sharing data. However, the federated model's performance on local data varies, disincentivising the participation of clients who benefit little from FL. Fair FL…

Machine Learning · Computer Science 2023-05-05 Alex Iacob , Pedro P. B. Gusmão , Nicholas D. Lane

Federated learning (FL) has gain growing interests for its capability of learning from distributed data sources collectively without the need of accessing the raw data samples across different sources. So far FL research has mostly focused…

Machine Learning · Computer Science 2021-10-22 Sen Cui , Weishen Pan , Jian Liang , Changshui Zhang , Fei Wang