1. School of Computer and Information Engineering, Tianjin Normal University (TJNU), Tianjin, China
2. National Laboratory of Pattern Recognition (NLPR), Institute of Automation, Chinese Academy of Sciences (CASIA), Bejing, China
3. School of Artificial Intelligence, Beijing University of Posts and Telecommunications, Beijing, China
4. ZD.B Chair of Embedded Intelligence for Health Care and Wellbeing, University of Augsburg, Augsburg, Germany