1. School of Computer Science, Zhongyuan University of Technology, Zhengzhou 450007, China
2. China Language Intelligence Research Center, Beijing 100089, China
3. Henan Key Laboratory on Public Opinion Intelligent Analysis, Zhengzhou 450007, China
4. Zhengzhou Key Laboratory of Text Processing and Image Understanding, Zhengzhou 450007, China
5. School of Information Science, North China University of Technology, Beijing 100144, China
6. The School of Telecommunications Engineering, Xidian University, Xi’an 710071, China