1. Yuxin Zhang, NLPR, Institute of Automation, Chinese Academy of Science and School of Artificial Intelligence, University of Chinese Academy of Sciences, Beijing, 100190, China. Email: zhangyuxin2020@ia.ac.cn.
2. Fan Tang, School of Artificial Intelligence, Jilin University, Changchun, 130012, Jilin, China. Email: tangfan@jlu.edu.cn.
3. Weiming Dong, NLPR, Institute of Automation, Chinese Academy of Science and School of Artificial Intelligence, Beijing, 100190, China. Email: weiming.dong@ia.ac.cn.
4. Thi-Ngoc-Hanh Le, Department of Computer Science and Information Engineering, National Cheng Kung University, Tainan 701, Taiwan. Email: ngochanh.le1987@gmail.com.
5. Changsheng Xu, NLPR, Institute of Automation, Chinese Academy of Science and School of Artificial Intelligence, Beijing, 100190, P. R China. Email: csxu@nlpr.ia.ac.cn.
6. Tong-Yee Lee, Department of Computer Science and Information Engineering, National Cheng Kung University, Tainan 701, Taiwan. Email: tonylee@ncku.edu.tw.