Baohan Xu, School of Computer Science, Shanghai Key Lab of Intelligent Information Processing, Fudan University, Shanghai, China Yanwei Fu, School of Data Science, Fudan University, Shanghai, China Yu-Gang Jiang, School of Computer Science, Shanghai Key Lab of Intelligent Information Processing, Fudan University, Shanghai, China Boyang Li, Disney Research, Pittsburgh, PA Leonid Sigal, Disney Research, Pittsburgh, PA