1. College of Computer, Chengdu University, Chengdu 610106, China
2. Key Laboratory of Pattern Recognition and Intelligent Information Processing, Institutions of Higher Education of Sichuan Province, Chengdu University, Chengdu 610106, China
3. School of Mathematical and Computational Science, Hunan University of Science and Technology, Xiangtan 411201, China
4. College of Physics and Electronic Information, Gannan Normal University, Ganzhou 341000, China