1. State-Province Joint Engineering and Research Center of Advanced Networking and Intelligent Information Services, School of Information Science and Technology, Northwest University, Xi’an, Shaanxi, China
2. School of Computer Science and Engineering, Nanyang Technological University, Jurong West, Singapore
3. Automation of School, Guangdong University of Technology, Guangzhou, China
4. School of Computing, University of Leeds, Leeds, U.K