@misc{wang-yao-xie-2026-mpsub,
  author        = {Yuyang Wang and Haoyu Yao and Pengcheng Xie},
  title         = {{MpSub}: A Momentum p-Dimensional Subspace Trust-Region Method for Derivative-Free Fine-Tuning of Large Language Models},
  year          = {2026},
  month         = sep,
  eprint        = {2609.07666},
  archivePrefix = {arXiv},
  primaryClass  = {cs.LG},
  doi           = {10.48550/arXiv.2609.07666},
  url           = {https://arxiv.org/abs/2609.07666},
  keywords      = {machine learning, optimization}
}

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