1. School of Computer Science and Engineering, Beihang University, Beijing, China
2. School of Software, Beihang University, Beijing, China
3. Institute of Future Cities, The Chinese University of Hong Kong, Hong Kong, China
4. School of Information Engineering, China University of Geosciences Beijing, Beijing, China
5. Kuaishou Inc., Beijing, China
6. School of Software, Beihang University & Zhongguancun Laboratory, Beijing, China
7. School of Computer Science and Engineering, Beihang University & Zhongguancun Laboratory, Beijing, China