1. Hubei Provincial Key Laboratory of Artificial Intelligence and Smart Learning, School of Computer, and National Language Resources Monitoring and Research Center for Network Media, Central China Normal University, Wuhan, Hubei, China
2. School of Computer, Central China Normal University, Wuhan, Hubei, China
3. School of Computer Science, Beijing University of Posts and Telecommunications, Beijing, China
4. College of Computing & Informatics, Drexel University, Philadelphia, PA, USA