1. Artificial Intelligence Research Institute, China University of Mining and Technology, Xuzhou, China
2. School of Information Science and Technology, Qingdao University of Science and Technology, Qingdao, China
3. School of Information and Control Engineering, China University of Mining and Technology, Xuzhou, China
4. Department of Electrical, Electronic, and Computer Engineering, University of Pretoria, Pretoria, South Africa
5. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, China
6. Alliance Manchester Business School, University of Manchester, Manchester, U.K.