1 Complex System and Computational Intelligence Laboratory, Taiyuan University of Science and Technology, Taiyuan, Shanxi 030024, China ; State Key Laboratory for Novel Software Technology, Nanjing University, Nanjing 210093, China.
2 West Texas A&M University, Canyon, TX 79016, USA.
3 Western Norway Research Institute, 6851 Sogndal, Norway.
4 School of Science and Technology, Middlesex University, London NW4 4BT, UK.