M-ANT: Efficient Low-bit Group Quantization for LLMs via Mathematically Adaptive Numerical Type. - Weiming Hu 005; Haoyan Zhang; Cong Guo 003; Yu Feng 007; Renyang Guan; Zhendong Hua; Zihan Liu 002; Yue Guan 003; Minyi Guo; Jingwen Leng (HPCA, 2025)