1. Fujian Provincial Key Laboratory of Big Data Mining and Applications, Fujian University of Technology, Fuzhou, Fujian, People's Republic of China
2. Intelligent Information Processing Research Center, Fujian University of Technology, Fuzhou, Fujian, People's Republic of China
3. College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, People's Republic of China
4. School of Network Engineering, Zhoukou Normal University, Zhoukou, Henan, People's Republic of China