1. Department of Information Science and Engineering, Xinjiang University, Urumqi, China
2. Department of Software, Key Laboratory of Software Engineering Technology, Key Laboratory of Signal and Information Processing, Xinjiang University, Urumqi, China
3. Key Laboratory of Big Data Applied Technology, State Ethnic Affairs Commission, Dalian Minzu University, Dalian, China
4. Department of Computer Science and Engineering, Dalian Minzu University, Dalian, China