1. Key Laboratory of Optimization Theory and Applications at China West Normal University of Sichuan Province, School of Computer Science, China West Normal University, Nanchong, China
2. School of Geographical Science, China West Normal University, Nanchong, China
3. School of Computer Science and Technology, Shandong Technology and Business University, Yantai, China
4. Computer Science Department, Wenzhou University, Wenzhou, China
5. School of Information and Engineering, Sichuan Tourism University, Chengdu, China
6. School of Electronic Information and Automation, Civil Aviation University of China, Tianjin, China