Open-Domain Targeted Sentiment Analysis via Span-Based Extraction and Classification Minghao Hu author Yuxing Peng author Zhen Huang author Dongsheng Li author Yiwei Lv author 2019-07 text Proceedings of the 57th Annual Meeting of the Association for Computational Linguistics Anna Korhonen editor David Traum editor Lluís Màrquez editor Association for Computational Linguistics Florence, Italy conference publication hu-etal-2019-open 10.18653/v1/P19-1051 https://aclanthology.org/P19-1051/ 2019-07 537 546