1. School of Computer Science and Engineering, Hebei University of Technology, Tianjin, China
2. National Engineering Research Center of Digital Life, Sun Yat-sen University, Guangzhou, China
3. Hebei Province Key Laboratory of Big Data Calculation, China
4. School of Communication and Design, Sun Yat-sen University, Guangzhou, China
5. Information Systems Department, New Jersey Institute of Technology, Newark, NJ, USA
6. SIAT, Chinese Academy of Science, Shenzhen, China