1. XinJiang Laboratory of Minority Speech and Language Information Processing, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, No. 40-1, Beijing South Road, Urumqi, Xinjiang, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. School of Cyber Science and Technology, Zhejiang University, Hangzhou 310000, Zhejiang, China
4. Computer Science Department, Tongji University, Shanghai 200000, China