1. Shaanxi Key Laboratory of Network Data Analysis and Intelligent Processing, School of Computer Science and Technology, Xi’an University of Posts and Telecommunications, Xi’an, China
2. School of Information Engineering, Xi’an Eurasia University, Xi’an, China
3. College of Physics and Information Engineering, Fuzhou University, Fuzhou, China
4. School of Mathematics and Computer Science, Yunnan Minzu University, Kunming, China