1 School of Big Data, Fuzhou University of International Studies and Trade, Fuzhou, 350202, China.
2 Department of Computer Science, National Yang Ming Chiao Tung University, Room 702, MIRC, No.1001, University Road, Hsinchu, 30010, Taiwan.
3 Department of Computer Science, National Yang Ming Chiao Tung University, Room 702, MIRC, No.1001, University Road, Hsinchu, 30010, Taiwan. smyuan@nycu.edu.tw.