1. School of Information Science and Technology and the National Engineering Laboratory of Integrated Transportation Big Data Application Technology, Southwest Jiaotong University, Chengdu, China
2. College of Computer Science, Sichuan Normal University, Chengdu, China
3. School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
4. Key Laboratory of Computational Optical Imaging Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, China
5. Department of Electrical and Computer Engineering, Mississippi State University, Starkville, MS, USA