Fast-in-Slow: A Dual-System VLA Model Unifying Fast Manipulation within Slow Reasoning - Chen, Hao; Liu, Jiaming; Gu, Chenyang; Liu, Zhuoyang; Zhang, Renrui; Li, Xiaoqi; He, Xiao; Guo, Yandong; Fu, Chi-Wing; Zhang, Shanghang; Heng, Pheng-Ann (Advances in Neural Information Processing Systems, 2025)