About the Authors

Feixian Liu

Roles Methodology, Writing – original draft

Affiliation School of Information Science and Technology, Hainan Normal University, Haikou, Hainan, China

Shulei Wu

Roles Writing – review & editing

wsl@hainnu.edu.cn

Affiliation School of Information Science and Technology, Hainan Normal University, Haikou, Hainan, China

Competing Interests

The authors have declared that no competing interests exist.