1. Institute of software,Chinese Academy of Sciences, China
2. Institute of Software, Chinese Academy of Science, China
3. Institute of software, Chinese Academy of Sciences, China
4. The Hong Kong University of Science and Technology (Guangzhou), Computational Media and Arts Thrust, China and Institute of Software, Chinese Academy of Sciences, China
5. Beijing Normal University, Department of Artificial Intelligence, China
6. Department of Computer Science, University of York, United Kingdom
7. Beijing Key Lab of Human-Computer Interactions, Institute of Software, Chinese Academy of Sciences, China