1. School of Mathematics and Physics, Guangxi Minzu University, Nanning, Guangxi, P.R. China
2. School of Electronic Information, Guangxi Minzu University, Nanning, Guangxi, P.R. China
3. Key Laboratory of Complex System Optimization and Big Data Processing in Department of Guangxi Education, Yulin Normal University, Yulin, Guangxi, P.R. China