About the Authors

Bo Hu

Affiliation IBM T. J. Watson Research Center, Yorktown Heights, New York, United States of America

Yuhai Tu

yuhai@us.ibm.com

Affiliation IBM T. J. Watson Research Center, Yorktown Heights, New York, United States of America

Competing Interests

The authors, BH and YT, are paid employees of IBM T. J. Watson Research Center. This does not alter our adherence to the PLOS policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: BH YT. Performed the experiments: BH YT. Analyzed the data: BH YT. Contributed reagents/materials/analysis tools: BH YT. Wrote the paper: BH YT.