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Author

Xuanhan Wu

3 papers indexed here

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#machine learning Preprint Sep 2026

AIM-ZO: Activation-Informed Subspace Maintenance for Zeroth-Order LLM Fine-Tuning

Zeroth-order (ZO) optimization offers a memory-efficient alternative for LLM fine-tuning by estimating updates only from forward evaluations of perturbed parameters, without backpropagation or activation storage. However, in billion-parameter LLMs, isotropic perturbations often waste many forward evaluations on weakly...

Yue Xie, Zhi Zheng, Yun-Peng Ba et al. · 0 citations
#machine learning Preprint Aug 2026

Understanding Evolution Strategies for LLM Reasoning: Broader Reasoning Coverage than GRPO

These findings position ES as a distinct reasoning post-training paradigm rather than a less effective, memory-efficient alternative to GRPO, and study how hyperparameter design affects the effectiveness of ES, demonstrating that ES requires a smaller population size in a larger LLM.

Yunpeng Ba, Zhi Zheng, Yue Xie et al. · 0 citations

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