About the Authors

Ji Lv

Affiliation School of Computer Science and Technology, Zhejiang Normal University, Jinhua, China

Guixia Liu

liugx@jlu.edu.cn‌‌ (GL); zhouchangjun@zjnu.edu.cn‌‌ (CZ)

Affiliations College of Computer Science and Technology, Jilin University, Changchun, China, Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education, Jilin University, Changchun, China

Changjun Zhou

liugx@jlu.edu.cn‌‌ (GL); zhouchangjun@zjnu.edu.cn‌‌ (CZ)

Affiliation School of Computer Science and Technology, Zhejiang Normal University, Jinhua, China

Competing Interests

The authors have declared that no competing interests exist.