1. Institute of Artificial Intelligence, University of Science and Technology Beijing, Beijing, China
2. College of Computer and Information Technology, China Three Gorges University, Yichang, China
3. School of Automation and Electrical Engineering, University of Science and Technology Beijing, Beijing, China
4. Henan Joint International Research Laboratory of Intelligent Networking and Data Analysis, School of Information Engineering, Zhengzhou University, Zhengzhou, China
5. School of Electronic Engineering and Computer Science, Queen Mary University of London, London, U.K.