About the Authors

Xin He

Affiliation Department of Computer Science, University of Illinois Urbana-Champaign, Urbana, Illinois, United States of America

Xu Ling

Affiliation Department of Computer Science, University of Illinois Urbana-Champaign, Urbana, Illinois, United States of America

Saurabh Sinha

sinhas@cs.uiuc.edu

Affiliation Department of Computer Science, University of Illinois Urbana-Champaign, Urbana, Illinois, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: XH SS. Performed the experiments: XH XL. Analyzed the data: XH XL. Contributed reagents/materials/analysis tools: XH SS. Wrote the paper: XH SS.