Heads-up! Unsupervised Constituency Parsing via Self-Attention Heads Bowen Li author Taeuk Kim author Reinald Kim Amplayo author Frank Keller author 2020-12 text Proceedings of the 1st Conference of the Asia-Pacific Chapter of the Association for Computational Linguistics and the 10th International Joint Conference on Natural Language Processing Kam-Fai Wong editor Kevin Knight editor Hua Wu editor Association for Computational Linguistics Suzhou, China conference publication li-etal-2020-heads 10.18653/v1/2020.aacl-main.43 https://aclanthology.org/2020.aacl-main.43/ 2020-12 409 424