SOUL: Unlocking the Power of Second-Order Optimization for LLM Unlearning

• URL: http://arxiv.org/abs/2404.18239v4
• Date: Mon, 24 Jun 2024 20:24:53 GMT
• Title: SOUL: Unlocking the Power of Second-Order Optimization for LLM Unlearning
• Authors: Jinghan Jia, Yihua Zhang, Yimeng Zhang, Jiancheng Liu, Bharat Runwal, James Diffenderfer, Bhavya Kailkhura, Sijia Liu,
• Abstract summary: Large Language Models (LLMs) have highlighted the necessity of effective unlearning mechanisms to comply with data regulations and ethical AI practices. While interest in studying LLM unlearning is growing, the impact of the choice for LLM unlearning remains unexplored. We shed light on the significance of selection in LLM unlearning for the first time, establishing a clear connection between second-order optimization and influence unlearning.
• Score: 30.25610464801255
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Large Language Models (LLMs) have highlighted the necessity of effective unlearning mechanisms to comply with data regulations and ethical AI practices. LLM unlearning aims at removing undesired data influences and associated model capabilities without compromising utility beyond the scope of unlearning. While interest in studying LLM unlearning is growing, the impact of the optimizer choice for LLM unlearning remains unexplored. In this work, we shed light on the significance of optimizer selection in LLM unlearning for the first time, establishing a clear connection between second-order optimization and influence unlearning (a classical approach using influence functions to update the model for data influence removal). This insight propels us to develop a second-order optimization-based LLM unlearning framework, termed Second-Order UnLearning (SOUL), which extends the static, one-shot model update using influence unlearning to a dynamic, iterative unlearning process. Our extensive experiments show that SOUL consistently outperforms conventional first-order methods across various unlearning tasks, models, and metrics, indicating that second-order optimization offers an effective and broadly applicable solution for LLM unlearning. Codes are available at https://github.com/OPTML-Group/SOUL.

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