1. School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
2. Key Laboratory for Computer Systems of State Ethnic Affairs Commission, Southwest Minzu University, Chengdu 610041, China
3. China-ASEAN International Joint Laboratory of Integrated Transportation, Nanning University, Nanning 530299, China
4. School of Mathematics, Southwest Minzu University, Chengdu 610041, China
5. School of Computer Science and Engineering, Southwest Minzu University, Chengdu 610041, China