1. School of Computer Science and Engineering, Nanjing University of Science and Technology, Nanjing, China
2. Shenzhen Key Laboratory of Visual Object Detection and Recognition, Harbin Institute of Technology, Shenzhen, China
3. Institute for Advanced Study in Mathematics, Harbin Institute of Technology, Heilongjiang, China
4. Terminus Group, Beijing, China
5. School of Artificial Intelligence, OPtics and ElectroNics (iOPEN), Northwestern Polytechnical University, Xi’an, P. R. China