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Machine unlearning, where users can request the deletion of a forget dataset, is becoming increasingly important because of numerous privacy regulations. Initial works on ``exact'' unlearning (e.g., retraining) incur large computational…

Machine Learning · Computer Science 2025-11-17 Ali Ebrahimpour-Boroojeny , Hari Sundaram , Varun Chandrasekaran

Since the recent advent of regulations for data protection (e.g., the General Data Protection Regulation), there has been increasing demand in deleting information learned from sensitive data in pre-trained models without retraining from…

Machine Learning · Computer Science 2024-01-17 Sungmin Cha , Sungjun Cho , Dasol Hwang , Honglak Lee , Taesup Moon , Moontae Lee

Recommender systems have become increasingly influential in shaping user behavior and decision-making, highlighting their growing impact in various domains. Meanwhile, the widespread adoption of machine learning models in recommender…

Information Retrieval · Computer Science 2025-12-04 Yuyuan Li , Xiaohua Feng , Chaochao Chen , Qiang Yang

Learned recommender systems may inadvertently leak information about their training data, leading to privacy violations. We investigate privacy threats faced by recommender systems through the lens of membership inference. In such attacks,…

Information Retrieval · Computer Science 2022-06-29 Zihan Wang , Na Huang , Fei Sun , Pengjie Ren , Zhumin Chen , Hengliang Luo , Maarten de Rijke , Zhaochun Ren

Recently, recommender systems have achieved promising performances and become one of the most widely used web applications. However, recommender systems are often trained on highly sensitive user data, thus potential data leakage from…

Cryptography and Security · Computer Science 2021-09-17 Minxing Zhang , Zhaochun Ren , Zihan Wang , Pengjie Ren , Zhumin Chen , Pengfei Hu , Yang Zhang

Machine learning models are vulnerable to adversarial attacks, including attacks that leak information about the model's training data. There has recently been an increase in interest about how to best address privacy concerns, especially…

Machine Learning · Computer Science 2024-05-30 Keltin Grimes , Collin Abidi , Cole Frank , Shannon Gallagher

Recommendation unlearning is an emerging task to serve users for erasing unusable data (e.g., some historical behaviors) from a well-trained recommender model. Existing methods process unlearning requests by fully or partially retraining…

Information Retrieval · Computer Science 2024-11-01 Yang Zhang , Zhiyu Hu , Yimeng Bai , Jiancan Wu , Qifan Wang , Fuli Feng

The ever-increasing adoption of Large Language Models in critical sectors like finance, healthcare, and government raises privacy concerns regarding the handling of sensitive Personally Identifiable Information (PII) during training. In…

Machine Learning · Computer Science 2026-01-06 Intae Jeon , Yujeong Kwon , Hyungjoon Koo

Approximate machine unlearning aims to remove the effect of specific data from trained models to ensure individuals' privacy. Existing methods focus on the removed records and assume the retained ones are unaffected. However, recent studies…

Machine Learning · Computer Science 2025-08-27 Yuechun Gu , Jiajie He , Keke Chen

Machine unlearning (MU) aims to expunge a designated forget set from a trained model without costly retraining, yet the existing techniques overlook two critical blind spots: "over-unlearning" that deteriorates retained data near the forget…

Machine Learning · Computer Science 2026-02-02 SeungBum Ha , Saerom Park , Sung Whan Yoon

With growing concerns surrounding privacy and regulatory compliance, the concept of machine unlearning has gained prominence, aiming to selectively forget or erase specific learned information from a trained model. In response to this…

Machine Learning · Computer Science 2024-01-18 Yoonhwa Jung , Ikhyun Cho , Shun-Hsiang Hsu , Julia Hockenmaier

Authentication is a task aiming to confirm the truth between data instances and personal identities. Typical authentication applications include face recognition, person re-identification, authentication based on mobile devices and so on.…

Machine Learning · Statistics 2019-05-29 Jian Liang , Yuren Cao , Chenbin Zhang , Shiyu Chang , Kun Bai , Zenglin Xu

Learning user preferences for products based on their past purchases or reviews is at the cornerstone of modern recommendation engines. One complication in this learning task is that some users are more likely to purchase products or review…

Information Retrieval · Computer Science 2023-03-08 Wanning Chen , Mohsen Bayati

Deep machine unlearning is the problem of `removing' from a trained neural network a subset of its training set. This problem is very timely and has many applications, including the key tasks of removing biases (RB), resolving confusion…

Machine Learning · Computer Science 2023-10-31 Meghdad Kurmanji , Peter Triantafillou , Jamie Hayes , Eleni Triantafillou

Large Language Models are typically trained on datasets collected from the web, which may inadvertently contain harmful or sensitive personal information. To address growing privacy concerns, unlearning methods have been proposed to remove…

Machine Learning · Computer Science 2025-10-23 Xiaoyu Wu , Yifei Pang , Terrance Liu , Zhiwei Steven Wu

Modern recommender systems heavily leverage user interaction data to deliver personalized experiences. However, relying on personal data presents challenges in adhering to privacy regulations, such as the GDPR's "right to be forgotten".…

Information Retrieval · Computer Science 2025-09-19 Pierre Lubitzsch , Olga Ovcharenko , Hao Chen , Maarten de Rijke , Sebastian Schelter

Transfer learning is an effective technique to improve a target recommender system with the knowledge from a source domain. Existing research focuses on the recommendation performance of the target domain while ignores the privacy leakage…

Artificial Intelligence · Computer Science 2021-01-14 Guangneng Hu , Qiang Yang

The growing demand for data privacy in Machine Learning (ML) applications has seen Machine Unlearning (MU) emerge as a critical area of research. As the `right to be forgotten' becomes regulated globally, it is increasingly important to…

Machine Learning · Computer Science 2025-02-25 Sadia Qureshi , Thanveer Shaik , Xiaohui Tao , Haoran Xie , Lin Li , Jianming Yong , Xiaohua Jia

Person attributes are often exploited as mid-level human semantic information to help promote the performance of person re-identification task. In this paper, unlike most existing methods simply taking attribute learning as a classification…

Computer Vision and Pattern Recognition · Computer Science 2019-02-28 Shuzhao Li , Huimin Yu , Wei Huang , Jing Zhang

In widely used neural network-based collaborative filtering models, users' history logs are encoded into latent embeddings that represent the users' preferences. In this setting, the models are capable of mapping users' protected attributes…

Machine Learning · Computer Science 2024-10-29 Gustavo Escobedo , Christian Ganhör , Stefan Brandl , Mirjam Augstein , Markus Schedl