Mask World Model: Predicting What Matters for Robust Robot Policy Learning. - Yunfan Lou; Xiaowei Chi; Xiaojie Zhang; Zezhong Qian; Chengxuan Li; Rongyu Zhang; Yaoxu Lyu; Guoyu Song; Chuyao Fu; Haoxuan Xu; Pengwei Wang 004; Shanghang Zhang (CoRR, 2026)