1. Department of Information Engineering, The Chinese University of Hong Kong, Shatin, NT, Hong Kong, (e-mail: ghzhang@ie.cuhk.edu.hk)
2. State Key Laboratory of Computer Architecture, Institute of Computing Technology, Chinese Academy of Sciences, Beijing, Beijing, China, (e-mail: liuke@ict.ac.cn)
3. Electronic and Information Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, (e-mail: haibo.hu@polyu.edu.hk)
4. Industrial Engineering, Purdue University, West Lafayette, Indiana, United States, 47907 (e-mail: vaneet@purdue.edu)
5. Department of Information Engineering, The Chinese University of Hong Kong, 26451 Hong Kong, Hong Kong, China, (e-mail: yblee@ie.cuhk.edu.hk)