1. School of Artificial Intelligence, Anhui University, Hefei, China
2. School of Business and Management, Royal Holloway, University of London, Egham, U.K.
3. State Key Laboratory of Power System and Generation Equipment and the Department of Electrical Engineering, Tsinghua University, Beijing, China
4. Department of Computer Science, Royal Holloway, University of London, Egham, U.K.
5. Department of Electronic Engineering, Royal Holloway, University of London, Egham, U.K.