1. Web Sciences Center, School of Computer Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
2. Big Data Research Center, University of Electronic Science and Technology of China, Chengdu 611731, China
3. Laboratory for the Modeling of Biological and Socio-Technical Systems, Northeastern University, Boston, Massachusetts 02115, USA
4. Center for Polymer Studies and Department of Physics, Boston, Massachusetts 02215, USA
5. College of Computer Science and Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China