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Pretrained large language models (LLMs) have revolutionized natural language processing (NLP) tasks such as summarization, question answering, and translation. However, LLMs pose significant security risks due to their tendency to memorize…

Computation and Language · Computer Science 2024-09-24 Zhepeng Wang , Runxue Bao , Yawen Wu , Jackson Taylor , Cao Xiao , Feng Zheng , Weiwen Jiang , Shangqian Gao , Yanfu Zhang

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…

Computation and Language · Computer Science 2025-06-17 Philipp Spohn , Leander Girrbach , Jessica Bader , Zeynep Akata

Large Language Models (LLMs) trained on extensive corpora inevitably retain sensitive data, such as personal privacy information and copyrighted material. Recent advancements in knowledge unlearning involve updating LLM parameters to erase…

Computation and Language · Computer Science 2024-10-08 Bozhong Tian , Xiaozhuan Liang , Siyuan Cheng , Qingbin Liu , Mengru Wang , Dianbo Sui , Xi Chen , Huajun Chen , Ningyu Zhang

As Multimodal Large Language Models (MLLMs) develop, their potential security issues have become increasingly prominent. Machine Unlearning (MU), as an effective strategy for forgetting specific knowledge in training data, has been widely…

Computer Vision and Pattern Recognition · Computer Science 2025-10-28 Junkai Chen , Zhijie Deng , Kening Zheng , Yibo Yan , Shuliang Liu , PeiJun Wu , Peijie Jiang , Jia Liu , Xuming Hu

LLMs have been found to memorize training textual sequences and regurgitate verbatim said sequences during text generation time. This fact is known to be the cause of privacy and related (e.g., copyright) problems. Unlearning in LLMs then…

Machine Learning · Computer Science 2024-05-07 George-Octavian Barbulescu , Peter Triantafillou

The objective of digital forgetting is, given a model with undesirable knowledge or behavior, obtain a new model where the detected issues are no longer present. The motivations for forgetting include privacy protection, copyright…

Cryptography and Security · Computer Science 2025-01-14 Alberto Blanco-Justicia , Najeeb Jebreel , Benet Manzanares , David Sánchez , Josep Domingo-Ferrer , Guillem Collell , Kuan Eeik Tan

Machine learning models may inadvertently memorize sensitive, unauthorized, or malicious data, posing risks of privacy breaches, security vulnerabilities, and performance degradation. To address these issues, machine unlearning has emerged…

Machine Learning · Computer Science 2024-04-08 Jie Xu , Zihan Wu , Cong Wang , Xiaohua Jia

Large language models (LLMs) have recently revolutionized language processing tasks but have also brought ethical and legal issues. LLMs have a tendency to memorize potentially private or copyrighted information present in the training…

Machine Learning · Computer Science 2025-07-21 Tamim Al Mahmud , Najeeb Jebreel , Josep Domingo-Ferrer , David Sanchez

Large language models (LLMs) exhibit remarkable generative capabilities but raise ethical and security concerns by memorizing sensitive data, reinforcing biases, and producing harmful content. These risks have spurred interest in LLM…

Machine Learning · Computer Science 2025-10-13 Changsheng Wang , Yihua Zhang , Dennis Wei , Jinghan Jia , Pin-Yu Chen , Sijia Liu

Recent advances in large reasoning models (LRMs) have enabled strong chain-of-thought (CoT) generation through test-time computation. While these multi-step reasoning capabilities represent a major milestone in language model performance,…

Artificial Intelligence · Computer Science 2025-10-14 Changsheng Wang , Chongyu Fan , Yihua Zhang , Jinghan Jia , Dennis Wei , Parikshit Ram , Nathalie Baracaldo , Sijia Liu

Large language model unlearning has garnered increasing attention due to its potential to address security and privacy concerns, leading to extensive research in the field. However, much of this research has concentrated on instance-level…

Computation and Language · Computer Science 2025-05-20 Weitao Ma , Xiaocheng Feng , Weihong Zhong , Lei Huang , Yangfan Ye , Xiachong Feng , Bing Qin

Recently, large language models (LLMs) have emerged as a notable field, attracting significant attention for its ability to automatically generate intelligent contents for various application domains. However, LLMs still suffer from…

Cryptography and Security · Computer Science 2024-04-29 Kongyang Chen , Zixin Wang , Bing Mi , Waixi Liu , Shaowei Wang , Xiaojun Ren , Jiaxing Shen

Machine unlearning is the task of updating machine learning (ML) models after a subset of the training data they were trained on is deleted. Methods for the task are desired to combine effectiveness and efficiency, i.e., they should…

Machine Learning · Computer Science 2021-08-17 Ananth Mahadevan , Michael Mathioudakis

Large language models (LLMs) risk retaining unauthorized or sensitive information from their training data, which raises privacy concerns. LLM unlearning seeks to mitigate these risks by selectively removing specified data while maintaining…

Computation and Language · Computer Science 2025-05-29 Hwan Chang , Hwanhee Lee

Large language models (LLMs) have shown great capabilities in various tasks but also exhibited memorization of training data, raising tremendous privacy and copyright concerns. While prior works have studied memorization during…

Artificial Intelligence · Computer Science 2024-02-26 Shenglai Zeng , Yaxin Li , Jie Ren , Yiding Liu , Han Xu , Pengfei He , Yue Xing , Shuaiqiang Wang , Jiliang Tang , Dawei Yin

Machine unlearning aims to remove the influence of specific training data from a model without requiring full retraining. This capability is crucial for ensuring privacy, safety, and regulatory compliance. Therefore, verifying whether a…

Computation and Language · Computer Science 2025-11-07 Liran Cohen , Yaniv Nemcovesky , Avi Mendelson

Training machine learning models requires the storage of large datasets, which often contain sensitive or private data. Storing data is associated with a number of potential risks which increase over time, such as database breaches and…

Machine Learning · Computer Science 2026-04-14 Aviraj Newatia , Michael Cooper , Viet Nguyen , Rahul G. Krishnan

Pre-trained large language models (LLMs) are becoming useful for various tasks. To improve their performance on certain tasks, it is necessary to fine-tune them on specific data corpora (e.g., medical reports, business data). These…

Machine Learning · Computer Science 2025-10-27 Antoine Boutet , Lucas Magnana

Large language models (LLMs) have been shown to memorize and reproduce content from their training data, raising significant privacy concerns, especially with web-scale datasets. Existing methods for detecting memorization are primarily…

Cryptography and Security · Computer Science 2026-01-07 Zhenpeng Wu , Jian Lou , Zibin Zheng , Chuan Chen

Machine unlearning (MU) for large language models (LLMs), commonly referred to as LLM unlearning, seeks to remove specific undesirable data or knowledge from a trained model, while maintaining its performance on standard tasks. While…

Machine Learning · Computer Science 2026-03-03 Yiwei Chen , Soumyadeep Pal , Yimeng Zhang , Qing Qu , Sijia Liu