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. Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB, Canada
4. School of Computer Science and Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan, China