1. Postdoctoral Fellow, School of Transportation Science and Engineering, Beihang Univ., No. 37 Xueyuan Rd., Haidian District, Beijing 100191, China.
2. Professor, School of Transportation Science and Engineering, Beihang Univ., No. 37 Xueyuan Rd., Haidian District, Beijing 100191, China.
3. Professor, Beijing Advanced Innovation Center for Big Data and Brain Computing, School of Transportation Science and Engineering, Beihang Univ., No. 37 Xueyuan Rd., Haidian District, Beijing 100191, China (corresponding author).
4. Ph.D. Student, School of Transportation Science and Engineering, Beihang Univ., No. 37 Xueyuan Rd., Haidian District, Beijing 100191, China.