[2605.21539] DualOptim+: Bridging Shared and Decoupled Optimizer States for Better Machine Unlearning in Large Language Models
[Submitted on 20 May 2026]
Title:DualOptim+: Bridging Shared and Decoupled Optimizer States for Better Machine Unlearning in Large Language Models
View a PDF of the paper titled DualOptim+: Bridging Shared and Decoupled Optimizer States for Better Machine Unlearning in Large Language Models, by Xuyang Zhong and 3 other authors
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Abstract:We propose DualOptim+, a novel optimization framework for improving machine unlearning in large language models. It introduces a base state to capture common representations shared by forgetting and retaining objectives and delta states to preserve objective-specific residuals. This architecture allows the optimizer to adaptively bridge shared and decoupled states based on the directional conflict between forgetting and retaining gradients. We further introduce DualOptim+ 8bit, a quantized variant that reduces memory overhead without compromising performance. Extensive experiments across fictitious and real-world unlearning, safety alignment, and multi-task learning tasks demonstrate that DualOptim+ consistently achieves a superior trade-off between different objectives. Codes are available at this https URL.
Comments: Accepted by ICML 2026
Subjects:
Machine Learning (cs.LG)
Cite as: arXiv:2605.21539 [cs.LG]
(or arXiv:2605.21539v1 [cs.LG] for this version)
https://doi.org/10.48550/arXiv.2605.21539
arXiv-issued DOI via DataCite
Submission history
From: Xuyang Zhong [view email] [v1] Wed, 20 May 2026 07:45:08 UTC (365 KB)
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