1. School of Computer and Information Technology, Key Laboratory of Big Data and Artificial Intelligence in Transportation (Ministry of Education), Beijing Jiaotong University, Beijing, China
2. School of Computer and Information Technology, Beijing Key Laboratory of Traffic Data Analysis and Mining, Beijing Jiaotong University, Beijing, China
3. Institute for Infocomm Research, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
4. School of Computer Science and Information Technology, Beijing Jiaotong University, Beijing, China
5. Intellectual Property Information Service Center, Beihang University, Beijing, China
6. Institute of Information Science, Beijing Jiaotong University, Beijing, China