1. College of Computer Science, Chongqing University, Chongqing 400044, P. R. China
2. State Key Laboratory of Internet of Things for Smart City, Department of Electrical and Computer Engineering, University of Macau, Macao, 999078, China
3. Qiannan Normal Coll Nationalities, Coll Comp & Informat, Doupengshan Rd, Duyun 558000 P. R. China
4. Key Laboratory of Complex Systems and Intelligent Optimization of Guizhou Province, Duyun 558000, P. R. China