Metis: Training LLMs with FP4 Quantization. - Hengjie Cao; Mengyi Chen; Yifeng Yang; Ruijun Huang; Fang Dong; Jixian Zhou; Anrui Chen; Mingzhi Dong; Yujiang Wang 001; Jinlong Hou; Yuan Cheng; Fan Wu; et al. (CoRR, 2025)