Tree-Structured Neural Topic Model Masaru Isonuma author Junichiro Mori author Danushka Bollegala author Ichiro Sakata author 2020-07 text Proceedings of the 58th Annual Meeting of the Association for Computational Linguistics Dan Jurafsky editor Joyce Chai editor Natalie Schluter editor Joel Tetreault editor Association for Computational Linguistics Online conference publication isonuma-etal-2020-tree 10.18653/v1/2020.acl-main.73 https://aclanthology.org/2020.acl-main.73/ 2020-07 800 806