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Federated Unlearning (FU) is an emerging paradigm in Federated Learning (FL) that enables participating clients to fully remove their contributions from a trained global model, driven by data protection regulations that mandate the right to…

Machine Learning · Computer Science 2026-04-30 Zhaoyuan Cai , Xinglin Zhang

Federated Learning (FL) has been widely concerned for it enables decentralized learning while ensuring data privacy. However, most existing methods unrealistically assume that the classes encountered by local clients are fixed over time.…

Machine Learning · Computer Science 2023-06-28 Chenghao Liu , Xiaoyang Qu , Jianzong Wang , Jing Xiao

Federated Learning (FL) enables collaborative, privacy-preserving model training, but supporting the "Right to be Forgotten" is especially challenging because data influences the model through distributed and interleaved client updates.…

Cryptography and Security · Computer Science 2026-03-03 Bokang Zhang , Hong Guan , Hong kyu Lee , Ruixuan Liu , Jia Zou , Li Xiong

Federated Learning (FL) is a decentralized learning paradigm, in which multiple clients collaboratively train deep learning models without centralizing their local data, and hence preserve data privacy. Real-world applications usually…

Machine Learning · Computer Science 2023-08-23 Haokun Chen , Ahmed Frikha , Denis Krompass , Jindong Gu , Volker Tresp

In Machine Learning, the emergence of \textit{the right to be forgotten} gave birth to a paradigm named \textit{machine unlearning}, which enables data holders to proactively erase their data from a trained model. Existing machine…

Cryptography and Security · Computer Science 2022-07-01 Yi Liu , Lei Xu , Xingliang Yuan , Cong Wang , Bo Li

Federated Unlearning (FU) aims to efficiently remove the influence of specific client data from a federated model while preserving utility for the remaining clients. However, three key challenges remain: (1) existing unlearning objectives…

Machine Learning · Computer Science 2026-02-03 Zeyan Wang , Zhengmao Liu , Yongxin Cai , Chi Li , Xiaoying Tang , Jingchao Chen , Zibin Pan , Jing Qiu

In recent years, the notion of ``the right to be forgotten" (RTBF) has become a crucial aspect of data privacy for digital trust and AI safety, requiring the provision of mechanisms that support the removal of personal data of individuals…

Cryptography and Security · Computer Science 2024-07-17 Ziyao Liu , Yu Jiang , Jiyuan Shen , Minyi Peng , Kwok-Yan Lam , Xingliang Yuan , Xiaoning Liu

The advent of Federated Learning (FL) highlights the practical necessity for the right to be forgotten for all clients, allowing them to request data deletion from the machine learning models service provider. This necessity has spurred a…

Machine Learning · Computer Science 2025-01-09 Hanlin Gu , Win Kent Ong , Chee Seng Chan , Lixin Fan

Machine unlearning in neural information retrieval (IR) systems requires removing specific data whilst maintaining model performance. Applying existing machine unlearning methods to IR may compromise retrieval effectiveness or inadvertently…

Information Retrieval · Computer Science 2025-07-25 Jingrui Hou , Axel Finke , Georgina Cosma

Modern computer systems store vast amounts of personal data, enabling advances in AI and ML but risking user privacy and trust. For privacy reasons, it is sometimes desired for an ML model to forget part of the data it was trained on. In…

Machine Learning · Computer Science 2025-12-30 Amartya Hatua , Trung T. Nguyen , Filip Cano , Andrew H. Sung

Federated learning is a promising privacy-preserving paradigm for distributed machine learning. In this context, there is sometimes a need for a specialized process called machine unlearning, which is required when the effect of some…

Cryptography and Security · Computer Science 2024-06-19 Heng Xu , Tianqing Zhu , Lefeng Zhang , Wanlei Zhou , Philip S. Yu

With the increasing importance of data privacy and security, federated unlearning has emerged as a novel research field dedicated to ensuring that federated learning models no longer retain or leak relevant information once specific data…

Machine Learning · Computer Science 2026-04-07 Houzhe Wang , Xiaojie Zhu , Chi Chen

In Federated Learning (FL), multiple clients collaboratively train a model without sharing raw data. This paradigm can be further enhanced by Differential Privacy (DP) to protect local data from information inference attacks and is thus…

Machine Learning · Computer Science 2024-12-10 Jianan Chen , Qin Hu , Fangtian Zhong , Yan Zhuang , Minghui Xu

Federated Learning (FL) has received much attention in recent years. However, although clients are not required to share their data in FL, the global model itself can implicitly remember clients' local data. Therefore, it's necessary to…

Machine Learning · Computer Science 2024-12-31 Zibin Pan , Zhichao Wang , Chi Li , Kaiyan Zheng , Boqi Wang , Xiaoying Tang , Junhua Zhao

Deep learning models often suffer from forgetting previously learned information when trained on new data. This problem is exacerbated in federated learning (FL), where the data is distributed and can change independently for each user.…

Machine Learning · Computer Science 2023-11-22 Sara Babakniya , Zalan Fabian , Chaoyang He , Mahdi Soltanolkotabi , Salman Avestimehr

Federated learning (FL) has recently emerged as a promising distributed machine learning (ML) paradigm. Practical needs of the "right to be forgotten" and countering data poisoning attacks call for efficient techniques that can remove, or…

Machine Learning · Computer Science 2021-05-07 Gaoyang Liu , Xiaoqiang Ma , Yang Yang , Chen Wang , Jiangchuan Liu

Federated learning achieves effective performance in modeling decentralized data. In practice, client data are not well-labeled, which makes it potential for federated unsupervised learning (FUSL) with non-IID data. However, the performance…

Machine Learning · Computer Science 2024-03-26 Xinting Liao , Weiming Liu , Chaochao Chen , Pengyang Zhou , Fengyuan Yu , Huabin Zhu , Binhui Yao , Tao Wang , Xiaolin Zheng , Yanchao Tan

Federated unlearning (FU) algorithms allow clients in federated settings to exercise their ''right to be forgotten'' by removing the influence of their data from a collaboratively trained model. Existing FU methods maintain data privacy by…

Cryptography and Security · Computer Science 2025-08-12 Samaneh Mohammadi , Vasileios Tsouvalas , Iraklis Symeonidis , Ali Balador , Tanir Ozcelebi , Francesco Flammini , Nirvana Meratnia

While numerous machine unlearning (MU) methods have recently been developed with promising results in erasing the influence of forgotten data, classes, or concepts, they are also highly vulnerable-for example, simple fine-tuning can…

Machine Learning · Computer Science 2026-04-10 Yichen Gao , Altay Unal , Akshay Rangamani , Zhihui Zhu

Federated learning (FL) enables multiple clients to train a machine learning model collaboratively without exchanging their local data. Federated unlearning is an inverse FL process that aims to remove a specified target client's…

Machine Learning · Computer Science 2023-02-27 Guanghao Li , Li Shen , Yan Sun , Yue Hu , Han Hu , Dacheng Tao