About the Authors

Hiroshi Ueda

Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Validation, Visualization, Writing – original draft, Writing – review & editing

ueda.h@lab.ntt.co.jp

Affiliation NTT Communication Science Laboratories, Nippon Telegraph and Telephone Co., Kanagawa, Japan

Naotoshi Abekawa

Roles Conceptualization, Investigation, Methodology, Supervision, Validation, Writing – review & editing

Affiliation NTT Communication Science Laboratories, Nippon Telegraph and Telephone Co., Kanagawa, Japan

Hiroaki Gomi

Roles Conceptualization, Funding acquisition, Investigation, Methodology, Project administration, Resources, Supervision, Validation, Writing – review & editing

Affiliation NTT Communication Science Laboratories, Nippon Telegraph and Telephone Co., Kanagawa, Japan

Competing Interests

The authors have declared that no competing interests exist.