About the Authors

Pingting Li

Roles Data curation, Investigation, Methodology, Writing – original draft, Writing – review & editing

Affiliation College of Information Science and Engineering, Hunan Normal University, Changsha, China

Minzhu Xie

Roles Methodology, Supervision, Writing – original draft, Writing – review & editing

xieminzhu@hunnu.edu.cn

Affiliation College of Information Science and Engineering, Hunan Normal University, Changsha, China

Competing Interests

The authors have declared that no competing interests exist.