About the Authors

Xiang Zhang
Department of Electrical Engineering and Computer Science, Case Western Reserve University, Ohio, United States of America

Shunping Huang, Zhaojun Zhang
Department of Computer Science, University of North Carolina at Chapel Hill, North Carolina, United States of America

Wei Wang
Department of Computer Science, University of California at Los Angeles, California, United States of America

Corresponding Author

weiwang@cs.ucla.edu

Competing Interests

The authors have declared that no competing interests exist.