1. College of Computer Science, the National and Local Joint Engineering Research Center of Intelligent Information Processing Technology for Mongolian, the Engineering Research Center of Ecological Big Data, the Ministry of Education, the Inner Mongolia Engineering Laboratory for Cloud Computing and Service Software, the Inner Mongolia Key Laboratory of Social Computing and Data Processing, and the Inner Mongolia Engineering Laboratory for Big Data Analysis Technology, Inner Mongolia University, Hohhot, China
2. Department of Electrical and Computer Engineering, Portland State University, Portland, OR, USA
3. Beijing Key Laboratory of Transportation Data Analysis and Mining, School of Computer and Information Technology, Beijing Jiaotong University, Beijing, China