1. College of Automation, Chongqing University, Chongqing 400044, People’s Republic of China
2. School of Computer Science and Engineering, Chongqing University of Technology, Chongqing 400054, People’s Republic of China
3. Chongqing Key Laboratory of Nonlinear Circuits and Intelligent Information Processing, College of Electronic and Information Engineering, Southwest University, Chongqing 400715, People’s Republic of China