1. Baidu Research, Beijing, China.
2. National Engineering Laboratory of Deep Learning Technology and Application, Beijing, China.
3. Nanjing University of Aeronautics and Astronautics, Nanjing, China.
4. Beijing Engineering Technology Research Center of Virtual Simulation and Visualization, Peking University, Beijing, China.
5. Deepwise AI Lab, Beijing, China.
6. Zhejiang University, Hangzhou, China.
7. University of Hong Kong, Hong Kong, China.
8. Beihang University, Beijing, China.
9. University of Maryland, College Park, MD, USA.