中文摘要：

Wuyang Ju received the BE degree from the School of Mathematics and Systems Sci- ence at Beihang University, China in 2013. He is currently a master candidate in the Department of Computer Science, Beihang University. His research interests include distributed storage system and graph pro- cessing. E-mail： lijx@act.buaa.edu.cn,Jianxin Li is an associate professor at the School of Computer Science and Engi- neering, Beihang University, China. He re- ceived his PhD degree from Beihang Uni- versity in 2008. He was a visiting scholar in machine learning department of Carnegie Mellon University, USA in 2015, and a vis- iting researcher of MSRA in 2011. His cur-rent research interests include data analysis and processing, dis- tributed systems, and system virtualization. Weiren Yu received the BE degree from the School of Advanced Engineering at Bei- hang University, China in 2011. He is cur- rently a PhD candidate in the Department of Computer Science, Beihang University since 2011. His research interests include distributed machine learning systems, scal- able graphical models and graph mining models for emerging event detection on social media. Richong Zhang received his BS degree and MASc degree from Jilin University, China in 2001 and 2004, respectively. In 2006, he received his MS degree from Dalhousie University, Canada. He received his PhD form the School of Information Technol- ogy and Engineering, University of Ottawa, Canada in 2011. He is currently an asso-ciate professor in the School of Computer Science and Engineering, Beihang University, China. His research interests include artificial intelligence and data mining.