1. College of Computer Science and Engineering, Chongqing Three Gorges University, Wanzhou, People's Republic of China
2. Key Laboratory of Intelligent Information Processing and Control of Chongqing Municipal Institutions of Higher education, Chongqing Three Gorges University, Wanzhou, People's Republic of China
3. School of Mathematics and Statistics, Hubei Minzu University, Enshi, People's Republic of China
4. School of Mathematics and Computer Science, Yunnan Minzu University, Kunming, People's Republic of China