1. School of Computer Science, Guangdong University of Technology, Guangzhou, China
2. Guangdong Provincial Key Laboratory of Public Finance and Taxation with Big Data Application, School of Computer Science, Guangdong University of Technology, Guangzhou, China
3. School of Computing and Information Systems, Singapore Management University, Singapore, Singapore
4. Institute for Infocomm Research (IR), ASTAR, Singapore, Singapore
5. College of Science, Shantou University, Shantou, China