1. School of Artificial Intelligence, Henan University, Zhengzhou, Henan, China
2. Singapore Institute of Manufacturing Technology (SIMTech), Adaptive Robotics and Mechatronics Group, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
3. Institute of Information Science, Beijing Jiaotong University, Beijing, China
4. School of Computer Science and Engineering, Central South University, Changsha, Hunan, China
5. School of Mechanical Engineering, Guizhou University, Guiyang, China
6. Department of Electrical and Computer Engineering, National University of Singapore, Singapore, Singapore