1. Mathematics and Computer Science of Fuzhou UniversityFuzhou350108People's Republic of China
2. Key Lab of Information Security of Network Systems (Fuzhou University)Fuzhou350108People's Republic of China
3. Henan Engineering Laboratory for Big Data Statistical Analysis and Optimal Control, Henan Normal UniversityXinxiang453007People's Republic of China
4. Institute of Software, Chinese Academy of SciencesBeijing100190People's Republic of China