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
7. School of Computer and Software, Nanjing University of Information Science and Technology, Nanjing, China