villa-X: Enhancing Latent Action Modeling in Vision-Language-Action Models. - Xiaoyu Chen; Hangxing Wei; Pushi Zhang; Chuheng Zhang; Kaixin Wang; Yanjiang Guo; Rushuai Yang; Yucen Wang; Xinquan Xiao; Li Zhao 007; Jianyu Chen; Jiang Bian 002 (CoRR, 2025)