1. School of Software and Information Security, Guangxi University for Nationalities, Nanning, Guangxi, P.R.China
2. Key Laboratory of Complex System Optimization and Big Data Processing in Department of Guangxi Education, Yulin Normal University, Yulin, Guangxi, P.R.China
3. School of Science, Guangxi University for Nationalities, Nanning, Guangxi, P.R.China
4. School of Information and Statistics, Guangxi University of Finance and Economics, Nanning, Guangxi, P.R.China