1. Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin, Hong Kong
2. Shenzhen Institute of Advanced Technology, Shenzhen, Guangdong, China
3. School of Computer Engineering, Jimei University, Xiamen, Fujian, China
4. Chongqing Research Center for Information and Automation Technology, Chongqing Academy of Science and Technology, Chongqing, China