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We study how to perform unlearning, i.e. forgetting undesirable misbehaviors, on large language models (LLMs). We show at least three scenarios of aligning LLMs with human preferences can benefit from unlearning: (1) removing harmful…

计算与语言 · 计算机科学 2024-02-20 Yuanshun Yao , Xiaojun Xu , Yang Liu

We explore machine unlearning (MU) in the domain of large language models (LLMs), referred to as LLM unlearning. This initiative aims to eliminate undesirable data influence (e.g., sensitive or illegal information) and the associated model…

Machine unlearning refers to the process of mitigating the influence of specific training data on machine learning models based on removal requests from data owners. However, one important area that has been largely overlooked in the…

密码学与安全 · 计算机科学 2025-07-17 Dayong Ye , Tianqing Zhu , Congcong Zhu , Derui Wang , Kun Gao , Zewei Shi , Sheng Shen , Wanlei Zhou , Minhui Xue

Unlearning in large language models (LLMs) aims to remove specified data, but its efficacy is typically assessed with task-level metrics like accuracy and perplexity. We show that these metrics can be misleading, as models can appear to…

计算与语言 · 计算机科学 2026-05-19 Xiaoyu Xu , Xiang Yue , Yang Liu , Qingqing Ye , Huadi Zheng , Peizhao Hu , Minxin Du , Haibo Hu

While Large Language Models (LLMs) excel at code generation, their inherent tendency toward verbatim memorization of training data introduces critical risks like copyright infringement, insecure emission, and deprecated API utilization,…

In recent years, unlearning techniques, which are methods for inducing a model to "forget" previously learned information, have attracted attention as a way to address privacy and copyright concerns in large language models (LLMs) and large…

机器学习 · 计算机科学 2025-10-29 Tatsuki Kawakami , Kazuki Egashira , Atsuyuki Miyai , Go Irie , Kiyoharu Aizawa

LLM have achieved success in many fields but still troubled by problematic content in the training corpora. LLM unlearning aims at reducing their influence and avoid undesirable behaviours. However, existing unlearning methods remain…

计算与语言 · 计算机科学 2024-08-21 Hongbang Yuan , Zhuoran Jin , Pengfei Cao , Yubo Chen , Kang Liu , Jun Zhao

Unlearning in large language models (LLMs) aims to remove harmful training data while preserving overall utility. However, we find that existing methods often hallucinate, generate abnormal token sequences, or behave inconsistently, raising…

机器学习 · 计算机科学 2026-05-12 Renjie Gu , Jiazhen Du , Yihua Zhang , Sijia Liu

Exact unlearning was first introduced as a privacy mechanism that allowed a user to retract their data from machine learning models on request. Shortly after, inexact schemes were proposed to mitigate the impractical costs associated with…

Recent advances in large language models (LLMs) have opened new opportunities for recommender systems by enabling rich semantic understanding and reasoning about user interests and item attributes. However, as privacy regulations tighten,…

信息检索 · 计算机科学 2026-04-08 Ziheng Chen , Jiali Cheng , Zezhong Fan , Hadi Amiri , Yunzhi Yao , Xiangguo Sun , Yang Zhang

Language models trained on web-scale corpora risk memorizing and exposing sensitive information, prompting the need for effective machine unlearning. Prior methods mainly focus on input queries to suppress sensitive outputs, yet this often…

人工智能 · 计算机科学 2025-10-01 Junbeom Kim , Kyuyoung Kim , Jihoon Tack , Dongha Lim , Jinwoo Shin

Unlearning in large language models (LLMs) involves precisely removing specific information from a pre-trained model. This is crucial to ensure safety of LLMs by deleting private data or harmful knowledge acquired during pre-training.…

机器学习 · 计算机科学 2025-09-04 Naman Deep Singh , Maximilian Müller , Francesco Croce , Matthias Hein

Large Language Models (LLMs) have shown to be a great success in a wide range of applications ranging from regular NLP-based use cases to AI agents. LLMs have been trained on a vast corpus of texts from various sources; despite the best…

计算与语言 · 计算机科学 2024-11-26 Abhinav Joshi , Shaswati Saha , Divyaksh Shukla , Sriram Vema , Harsh Jhamtani , Manas Gaur , Ashutosh Modi

Large language model (LLM) unlearning has demonstrated its essential role in removing privacy and copyright-related responses, crucial for their legal and safe applications. However, the pursuit of complete unlearning often comes with…

机器学习 · 计算机科学 2025-06-06 Yue Wang , Qizhou Wang , Feng Liu , Wei Huang , Yali Du , Xiaojiang Du , Bo Han

Multimodal large language models (MLLMs) may memorize sensitive cross-modal information during pretraining, making machine unlearning (MU) crucial. Existing methods typically evaluate unlearning effectiveness based on output deviations,…

计算与语言 · 计算机科学 2026-05-18 Jiahui Guang , Yingjie Zhu , Cuiyun Gao , Haiyan Wang , Jing Li , Di Shao , Zhaoquan Gu

Unlearning in Large Language Models (LLMs) is essential for ensuring ethical and responsible AI use, especially in addressing privacy leak, bias, safety, and evolving regulations. Existing approaches to LLM unlearning often rely on retain…

计算与语言 · 计算机科学 2024-10-16 Yaxuan Wang , Jiaheng Wei , Chris Yuhao Liu , Jinlong Pang , Quan Liu , Ankit Parag Shah , Yujia Bao , Yang Liu , Wei Wei

Large language model unlearning aims to remove harmful information that LLMs have learnt to prevent their use for malicious purposes. LLMU and RMU have been proposed as two methods for LLM unlearning, achieving impressive results on…

计算与语言 · 计算机科学 2025-02-25 Jai Doshi , Asa Cooper Stickland

Driven by privacy protection laws and regulations, unlearning in Large Language Models (LLMs) is gaining increasing attention. However, current research often neglects the interpretability of the unlearning process, particularly concerning…

机器学习 · 计算机科学 2025-04-10 Xiaohua Feng , Yuyuan Li , Chengye Wang , Junlin Liu , Li Zhang , Chaochao Chen

Machine unlearning aims to erase requested data from trained models without full retraining. For Reasoning Multimodal Large Language Models (RMLLMs), this is uniquely challenging: intermediate chain-of-thought steps can still leak sensitive…

计算与语言 · 计算机科学 2025-12-23 Hongji Li , Junchi yao , Manjiang Yu , Priyanka Singh , Xue Li , Di Wang , Lijie Hu

As large language models (LLMs) are trained on massive datasets, they have raised significant privacy and ethical concerns due to their potential to inadvertently retain sensitive information. Unlearning seeks to selectively remove specific…

计算与语言 · 计算机科学 2025-06-17 Philipp Spohn , Leander Girrbach , Jessica Bader , Zeynep Akata