Efficient and Accurate Post-Training Sparsification of Large Language Models with Proximal Operators. - Pu Zhao 001; Dani Gunawan; Xuan Shen; Zheng Zhan 001; Xuehang Guo; Jun Liu 075; Zhenglun Kong; Yanzhi Wang 001; Gaowen Liu; Xue Lin 001 (RichMediaGAI@MM, 2025)