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In Federated Reinforcement Learning (FRL), agents aim to collaboratively learn a common task, while each agent is acting in its local environment without exchanging raw trajectories. Existing approaches for FRL either (a) do not provide any…

Machine Learning · Computer Science 2024-01-09 Philip Jordan , Florian Grötschla , Flint Xiaofeng Fan , Roger Wattenhofer

Federated learning (FL) is an emerging distributed learning paradigm without sharing participating clients' private data. However, existing works show that FL is vulnerable to both Byzantine (security) attacks and data reconstruction…

Cryptography and Security · Computer Science 2024-07-30 Chenfei Nie , Qiang Li , Yuxin Yang , Yuede Ji , Binghui Wang

With the increasing importance of machine learning, the privacy and security of training data have become critical. Federated learning, which stores data in distributed nodes and shares only model parameters, has gained significant…

Machine Learning · Computer Science 2025-07-10 Yang Li , Chunhe Xia , Chang Li , Tianbo Wang

Federated Learning (FL) thrives in training a global model with numerous clients by only sharing the parameters of their local models trained with their private training datasets. Therefore, without revealing the private dataset, the…

Machine Learning · Computer Science 2024-03-06 Younghan Lee , Yungi Cho , Woorim Han , Ho Bae , Yunheung Paek

Federated learning (FL) allows multiple clients to collaboratively train a global machine learning model through a server, without exchanging their private training data. However, the decentralized aspect of FL makes it susceptible to…

Cryptography and Security · Computer Science 2025-01-30 Minghong Fang , Seyedsina Nabavirazavi , Zhuqing Liu , Wei Sun , Sundararaja Sitharama Iyengar , Haibo Yang

Federated Learning (FL) enables heterogeneous clients to collaboratively train a shared model without centralizing their raw data, offering an inherent level of privacy. However, gradients and model updates can still leak sensitive…

Machine Learning · Computer Science 2026-04-07 Rustem Islamov , Grigory Malinovsky , Alexander Gaponov , Aurelien Lucchi , Peter Richtárik , Eduard Gorbunov

Federated learning (FL) is a privacy-preserving machine learning technique that facilitates collaboration among participants across demographics. FL enables model sharing, while restricting the movement of data. Since FL provides…

Machine Learning · Computer Science 2025-10-15 Harsh Kasyap , Minghong Fang , Zhuqing Liu , Carsten Maple , Somanath Tripathy

Federated learning (FL) enables multiple participants to train a global machine learning model without sharing their private training data. Peer-to-peer (P2P) FL advances existing centralized FL paradigms by eliminating the server that…

Machine Learning · Computer Science 2024-01-12 Zhangchen Xu , Fengqing Jiang , Luyao Niu , Jinyuan Jia , Radha Poovendran

Federated Learning (FL) enables multiple clients to collaboratively train a model without sharing their local data. Yet the FL system is vulnerable to well-designed Byzantine attacks, which aim to disrupt the model training process by…

Machine Learning · Computer Science 2024-09-05 Jiahao Xu , Zikai Zhang , Rui Hu

We consider the federated learning problem where data on workers are not independent and identically distributed (i.i.d.). During the learning process, an unknown number of Byzantine workers may send malicious messages to the central node,…

Machine Learning · Computer Science 2021-08-31 Jie Peng , Zhaoxian Wu , Qing Ling , Tianyi Chen

Federated learning has arisen as a mechanism to allow multiple participants to collaboratively train a model without sharing their data. In these settings, participants (workers) may not trust each other fully; for instance, a set of…

Machine Learning · Computer Science 2021-07-28 Kamala Varma , Yi Zhou , Nathalie Baracaldo , Ali Anwar

Federated Learning (FL) enables collaborative model training across distributed medical institutions while preserving patient privacy, but remains vulnerable to Byzantine attacks and statistical heterogeneity. We present OptiGradTrust, a…

Machine Learning · Computer Science 2025-08-01 Mohammad Karami , Fatemeh Ghassemi , Hamed Kebriaei , Hamid Azadegan

Federated Learning (FL) has become a powerful technique for training Machine Learning (ML) models in a decentralized manner, preserving the privacy of the training datasets involved. However, the decentralized nature of FL limits the…

Machine Learning · Computer Science 2025-08-27 Enrique Mármol Campos , Aurora González Vidal , José Luis Hernández Ramos , Antonio Skarmeta

We study a recently proposed large-scale distributed learning paradigm, namely Federated Learning, where the worker machines are end users' own devices. Statistical and computational challenges arise in Federated Learning particularly in…

Machine Learning · Computer Science 2019-10-11 Avishek Ghosh , Justin Hong , Dong Yin , Kannan Ramchandran

Federated learning (FL) is a privacy-friendly type of machine learning where devices locally train a model on their private data and typically communicate model updates with a server. In decentralized FL (DFL), peers communicate model…

Distributed, Parallel, and Cluster Computing · Computer Science 2021-10-22 Joost Verbraeken , Martijn de Vos , Johan Pouwelse

Federated learning (FL) has emerged as a promising paradigm in machine learning, enabling collaborative model training across decentralized devices without the need for raw data sharing. In FL, a global model is trained iteratively on local…

Machine Learning · Computer Science 2025-04-01 Kanishka Ranaweera , Azadeh Ghari Neiat , Xiao Liu , Bipasha Kashyap , Pubudu N. Pathirana

\textit{Federated learning} (FL) is a nascent distributed learning paradigm to train a shared global model without violating users' privacy. FL has been shown to be vulnerable to various Byzantine attacks, where malicious participants could…

Cryptography and Security · Computer Science 2023-08-08 Wei Wan , Shengshan Hu , Minghui Li , Jianrong Lu , Longling Zhang , Leo Yu Zhang , Hai Jin

Federated learning (FL) triggers intra-client and inter-client class imbalance, with the latter compared to the former leading to biased client updates and thus deteriorating the distributed models. Such a bias is exacerbated during the…

Machine Learning · Computer Science 2024-12-24 Chenguang Xiao , Zheming Zuo , Shuo Wang

Given sufficient data from multiple edge devices, federated learning (FL) enables training a shared model without transmitting private data to the central server. However, FL is generally vulnerable to Byzantine attacks from compromised…

Machine Learning · Computer Science 2025-09-18 Youngjoon Lee , Jinu Gong , Joonhyuk Kang

While being an effective framework of learning a shared model across multiple edge devices, federated learning (FL) is generally vulnerable to Byzantine attacks from adversarial edge devices. While existing works on FL mitigate such…

Machine Learning · Computer Science 2022-11-01 Youngjoon Lee , Sangwoo Park , Joonhyuk Kang