1. Department of Computer Science, Huanggang Normal University, Huangzhou, China
2. School of Computer Science and Engineering, Southeast University, Nanjing, China
3. Information Systems Department, College of Computer and Information Sciences, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, Saudi Arabia
4. Visual Analytics for Knowledge Laboratory, Department of Applied Artificial Intelligence, School of Convergence, College of Computing and Informatics, Sungkyunkwan University, Jongno-gu, South Korea