1. School of Mathematics and Computing Science, Guilin University of Electronic Technology, Guilin, People's Republic of China
2. Key Laboratory of Computing and Stochastic Mathematics (Ministry of Education), School of Mathematics and Statistics, Hunan Normal University, Changsha, People's Republic of China
3. Guangxi Colleges and Universities Key Laboratory of Data Analysis and Computation, School of Mathematics and Computing Science, Guilin University of Electronic Technology, Guilin, People's Republic of China