1. Fujian Provincial Key Laboratory of Big Data Mining and Applications, Fujian University of Technology, Fuzhou, Fujian 350118, China
2. Intelligent Information Processing Research Center, Fujian University of Technology, Fuzhou, Fujian 350118, China
3. Guangxi Key Laboratory of Automatic Detecting Technology and Instruments, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China
4. School of Network Engineering, Zhoukou Normal University, Zhoukou, Henan 466001, China