1. School of Computer Science and Engineering, Linyi University and the School of Computer and Communication Engineering, University of Science and Technology Beijing, Beijing, China
2. School of Computer and Communication Engineering, University of Science and Technology Beijing, Beijing, China
3. School of Computer Science, University College Dublin, Dublin 4, Ireland
4. Faculty of Informatics Engineering, Aleppo University, Aleppo, Syria
5. Department of Computer Science, Blekinge Institute of Technology, Karlskrona, Sweden
6. Department of Business Intelligence and Analytics and the Department of Computer Science, Stevens Institute of Technology, Hoboken, NJ, USA