1. College of Information Science and Technology, Beijing University of Chemical Technology, Beijing, China
2. Department of Mechanical Engineering, Tokyo Institute of Technology, Tokyo, Japan
3. Institute of Automation, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Beijing, China
4. College of Mechanical and Electrical, Beijing University of Chemical Technology, Beijing, China
5. Thrust of Robotics and Autonomous Systems, The Hong Kong University of Science and Technology (Guangzhou), Guangzhou, China