1. College of Artificial Intelligence, Southwest University, Chongqing, P.R. China
2. Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB, Canada
3. Division of Graduate Studies and Research, Tijuana Institute of Technology, Tijuana, Mexico
4. School of Computer and Information Technology, Shanxi University, Taiyuan, P.R. China
5. School of Mathematics and Statistics, Southwest University, Chongqing, P.R. China