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Federated Learning (FL) emerged as a solution for collaborative medical image classification while preserving data privacy. However, label noise, which arises from inter-institutional data variability, can cause training instability and…

Machine Learning · Computer Science 2025-07-16 Mengwen Ye , Yingzi Huangfu , Shujian Gao , Wei Ren , Weifan Liu , Zekuan Yu

We address the problem of federated domain generalization in an unsupervised setting for the first time. We first theoretically establish a connection between domain shift and alignment of gradients in unsupervised federated learning and…

Machine Learning · Computer Science 2025-01-06 Farhad Pourpanah , Mahdiyar Molahasani , Milad Soltany , Michael Greenspan , Ali Etemad

Exploiting deep learning in medical imaging faces critical challenges, including strict privacy constraints, heterogeneous imaging devices with varying acquisition properties, and class imbalance due to the uneven prevalence of pathologies.…

Computer Vision and Pattern Recognition · Computer Science 2026-04-30 Martina Pavan , Matteo Caligiuri , Francesco Barbato , Pietro Zanuttigh

Federated Learning (FL) faces significant challenges with domain shifts in heterogeneous data, degrading performance. Traditional domain generalization aims to learn domain-invariant features, but the federated nature of model averaging…

Machine Learning · Computer Science 2024-05-29 Marc Bartholet , Taehyeon Kim , Ami Beuret , Se-Young Yun , Joachim M. Buhmann

Dataset-level heterogeneity introduces significant domain biases that fundamentally degrade generalization on general Time Series Foundation Models (TSFMs), yet this challenge remains underexplored. This paper rethinks the from-scratch…

Machine Learning · Computer Science 2026-03-17 Shengchao Chen , Guodong Long , Michael Blumenstein , Jing Jiang

Personalized Federated Learning aims at addressing the challenges of non-IID data in collaborative model training. However, existing methods struggle to balance personalization and generalization, often oversimplifying client similarities…

Machine Learning · Computer Science 2025-12-03 Mattia Giovanni Campana , Franca Delmastro

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 learning (FL) is a privacy-preserving distributed learning paradigm that enables clients to jointly train a global model. In real-world FL implementations, client data could have label noise, and different clients could have…

Machine Learning · Computer Science 2022-04-12 Jingyi Xu , Zihan Chen , Tony Q. S. Quek , Kai Fong Ernest Chong

Federated learning aims to collaboratively learn a model by using the data from multiple users under privacy constraints. In this paper, we study the multi-label classification problem under the federated learning setting, where trivial…

Machine Learning · Computer Science 2024-04-25 Xuming An , Dui Wang , Li Shen , Yong Luo , Han Hu , Bo Du , Yonggang Wen , Dacheng Tao

While existing federated learning approaches mostly require that clients have fully-labeled data to train on, in realistic settings, data obtained at the client-side often comes without any accompanying labels. Such deficiency of labels may…

Machine Learning · Computer Science 2021-03-30 Wonyong Jeong , Jaehong Yoon , Eunho Yang , Sung Ju Hwang

Federated Learning (FL) heavily depends on label quality for its performance. However, the label distribution among individual clients is always both noisy and heterogeneous. The high loss incurred by client-specific samples in…

Machine Learning · Computer Science 2024-03-26 Xinyuan Ji , Zhaowei Zhu , Wei Xi , Olga Gadyatskaya , Zilong Song , Yong Cai , Yang Liu

Federated Learning has emerged as a leading paradigm for decentralized, privacy-preserving learning, particularly relevant in the era of interconnected edge devices equipped with sensors. However, the practical implementation of Federated…

Machine Learning · Computer Science 2025-07-15 Manuel Röder , Christoph Raab , Frank-Michael Schleif

Federated Learning (FL) enables decentralized model training across multiple parties while preserving privacy. However, most FL systems assume clients hold only unimodal data, limiting their real-world applicability, as institutions often…

Machine Learning · Computer Science 2025-04-17 Yu Zhang , Qingfeng Du , Jiaqi Lv

Federated learning (FL) is emerging as a promising technique for collaborative learning without local data leaving their devices. However, clients' data originating from diverse domains may degrade model performance due to domain shifts,…

Computer Vision and Pattern Recognition · Computer Science 2025-03-18 Zheng Wang , Zihui Wang , Zheng Wang , Xiaoliang Fan , Cheng Wang

Heterogeneity arising from label distribution skew and data scarcity can cause inaccuracy and unfairness in intelligent communication applications that heavily rely on distributed computing. To deal with it, this paper proposes a novel…

Machine Learning · Computer Science 2025-09-18 Chenghao Huang , Xiaolu Chen , Yanru Zhang , Hao Wang

Federated Graph Learning (FGL) is a distributed machine learning paradigm based on graph neural networks, enabling secure and collaborative modeling of local graph data among clients. However, label noise can degrade the global model's…

Machine Learning · Computer Science 2024-12-02 De Li , Haodong Qian , Qiyu Li , Zhou Tan , Zemin Gan , Jinyan Wang , Xianxian Li

Federated Learning (FL) offers a decentralized paradigm for collaborative model training without direct data sharing, yet it poses unique challenges for Domain Generalization (DG), including strict privacy constraints, non-i.i.d. local…

Machine Learning · Computer Science 2025-01-28 Sunny Gupta , Vinay Sutar , Varunav Singh , Amit Sethi

We approach the challenge of addressing semi-supervised domain generalization (SSDG). Specifically, our aim is to obtain a model that learns domain-generalizable features by leveraging a limited subset of labelled data alongside a…

Computer Vision and Pattern Recognition · Computer Science 2024-05-08 Chamuditha Jayanga Galappaththige , Sanoojan Baliah , Malitha Gunawardhana , Muhammad Haris Khan

Self-supervised learning in the federated learning paradigm has been gaining a lot of interest both in industry and research due to the collaborative learning capability on unlabeled yet isolated data. However, self-supervised based…

Machine Learning · Computer Science 2025-02-05 Sunder Ali Khowaja , Kapal Dev , Syed Muhammad Anwar , Marius George Linguraru

Federated domain generalization (FedDG) addresses distribution shifts among clients in a federated learning framework. FedDG methods aggregate the parameters of locally trained client models to form a global model that generalizes to unseen…

Machine Learning · Computer Science 2025-12-12 Ragja Palakkadavath , Hung Le , Thanh Nguyen-Tang , Svetha Venkatesh , Sunil Gupta