1. Northwest Minzu University,Key Laboratory of Linguistic and Cultural Computing of Ministry of Education,Lanzhou,China
2. Northwest Minzu University,Chinese National Information Technology Research Institute,Lanzhou,China
3. Northwest Minzu University,College of Mathematics and Computer Science,Lanzhou,China
4. Gansu Province Northwest Minzu University,Key Laboratory of Minzu Languages and Cultures Intelligent Information Processing,Lanzhou,China