1. Beijing Key Laboratory of Computational Intelligence and Intelligent System, the Beijing Laboratory of Smart Environmental Protection, the Faculty of Information Technology, Beijing Institute of Artificial Intelligence, Beijing University of Technology, Beijing, China
2. Centre for Computational Intelligence, School of Computer Science and Informatics, De Montfort University, Leicester, U.K.
3. Beijing Key Laboratory of Multimedia and Intelligent Software Technology, the Faculty of Information Technology, Beijing Institute of Artificial Intelligence, Beijing University of Technology, Beijing, China