1. College of Computer Science and Engineering, Shandong University of Science and Technology, Qingdao, China
2. Institute of Artificial Intelligence, Fujian University of Technology, Fuzhou, China
3. Fujian Provincial Key Lab of Big Data Mining and Applications, Fujian University of Technology, Fuzhou, China
4. Guanzhuang Central Primary School of Zhangqiu District, Jinan, China