1. School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, Hubei, China
2. School of Automation, Guangdong University of Technology, Guangzhou, Guangdong, China
3. School of Computer Science and Engineering, Nanyang Technological University, Singapore
4. Pillar of Information Systems Technology and Design, Singapore University of Technology and Design, Singapore
5. Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ON, Canada