A Case Study of In-House Competition for Ranking Constructive Comments in a News Service Hayato Kobayashi author Hiroaki Taguchi author Yoshimune Tabuchi author Chahine Koleejan author Ken Kobayashi author Soichiro Fujita author Kazuma Murao author Takeshi Masuyama author Taichi Yatsuka author Manabu Okumura author Satoshi Sekine author 2021-06 text Proceedings of the Ninth International Workshop on Natural Language Processing for Social Media Lun-Wei Ku editor Cheng-Te Li editor Association for Computational Linguistics Online conference publication kobayashi-etal-2021-case 10.18653/v1/2021.socialnlp-1.3 https://aclanthology.org/2021.socialnlp-1.3/ 2021-06 24 35