1. School of Computer Science and Engineering, Central South University,Changsha,China
2. School of Information Technology, Carleton University,Ottawa,Ontario,Canada,K1S 5B6
3. Big Data Institute, Central South University,Changsha,China
4. Hunan Energy Big Data Intelligence Limited,Changsha,China
5. University of Waterloo,Department of Electrical and Computer Engineering,Waterloo,Ontario,Canada