1. Australian AI Institute, Faculty of Engineering and Information Technology, University of Technology Sydney, Ultimo, NSW, Australia
2. College of Mathematics and Econometrics, Hunan University, Changsha, China
3. School of Electronic Information and Electrical Engineering, Chengdu University, Chengdu, China
4. School of Mathematics, China University of Mining and Technology, Xuzhou, China
5. Science Program, Texas A & M University at Qatar, Doha, Qatar