About the Authors

Yang Shi

Contributed equally to this work with: Yang Shi, Qinpei Zhao

Affiliation School of software engineering, Tongji University, Shanghai, China

Qinpei Zhao

Contributed equally to this work with: Yang Shi, Qinpei Zhao

Affiliation School of software engineering, Tongji University, Shanghai, China

Hongfei Fan

Affiliation School of software engineering, Tongji University, Shanghai, China

Qin Liu

qin.liu@tongji.edu.cn

Affiliation School of software engineering, Tongji University, Shanghai, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Wrote the paper: YS. Validated the algorithms and proof-read the manuscript: QZ. Reviewed the paper: HF QL. Provided applications: HF. Provided extensions: QL.