Target-specified Sequence Labeling with Multi-head Self-attention for Target-oriented Opinion Words Extraction Yuhao Feng author Yanghui Rao author Yuyao Tang author Ninghua Wang author He Liu author 2021-06 text Proceedings of the 2021 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies Kristina Toutanova editor Anna Rumshisky editor Luke Zettlemoyer editor Dilek Hakkani-Tur editor Iz Beltagy editor Steven Bethard editor Ryan Cotterell editor Tanmoy Chakraborty editor Yichao Zhou editor Association for Computational Linguistics Online conference publication feng-etal-2021-target 10.18653/v1/2021.naacl-main.145 https://aclanthology.org/2021.naacl-main.145/ 2021-06 1805 1815