1. Anhui Province Key Laboratory of Affective Computing and Advanced Intelligent Machine, School of Computer and Information, Hefei University of Technology, Hefei, Anhui, China
2. School of Computer and Information, Hefei University of Technology, Hefei, Anhui, China
3. School of Computer Science and Engineering, Southeast University, Nanjing, China
4. Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB, Canada