Publication Sep 14, 2026 arXiv:2609.15838Per-Matrix Optimality Is Not Enough: Three-Level Optimization for Low-Rank LLM CompressionHuicheng Zhang, Xiyao Feng, Ze-Tong Li, Chengkai Zhu, Xiao Shi, Xiwei Pan, Jinguo Liu, Ge Bai, Xin WangPDF Cite DOI