{"type":"ScholarlyArticle","title":"A Span-based Joint Model for Opinion Target Extraction and Target Sentiment Classification","authors":[{"name":"Yan Zhou","slug":"yan-zhou","given":"Yan","family":"Zhou","affiliation":"Institute of Information Engineering , Chinese Academy of Sciences , Beijing , China; School of Cyber Security , University of Chinese Academy of Sciences , Beijing , China"},{"name":"Longtao Huang","slug":"longtao-huang","given":"Longtao","family":"Huang","affiliation":"Alibaba Group Turing Lab"},{"name":"Tao Guo","slug":"tao-guo","given":"Tao","family":"Guo","affiliation":"Institute of Information Engineering , Chinese Academy of Sciences , Beijing , China"},{"name":"Jizhong Han","slug":"jizhong-han","given":"Jizhong","family":"Han","affiliation":"Institute of Information Engineering , Chinese Academy of Sciences , Beijing , China"},{"name":"Songlin Hu","slug":"songlin-hu","given":"Songlin","family":"Hu","affiliation":"Institute of Information Engineering , Chinese Academy of Sciences , Beijing , China; School of Cyber Security , University of Chinese Academy of Sciences , Beijing , China"}],"abstract":"Target-Based Sentiment Analysis aims at extracting opinion targets and classifying the sentiment polarities expressed on each target. Recently, token based sequence tagging methods have been successfully applied to jointly solve the two tasks, which aims to predict a tag for each token. Since they do not treat a target containing several words as a whole, it might be difficult to make use of the global information to identify that opinion target, leading to incorrect extraction. Independently predicting the sentiment for each token may also lead to sentiment inconsistency for different words in an opinion target. In this paper, inspired by span-based methods in NLP, we propose a simple and effective joint model to conduct extraction and classification at span level rather than token level. Our model first emulates spans with one or more tokens and learns their representation based on the tokens inside. And then, a span-aware attention mechanism is designed to compute the sentiment information towards each span. Extensive experiments on three benchmark datasets show that our model consistently outperforms the state-of-the-art methods.","doi":"10.24963/ijcai.2019/762","url":"https://ijcai.org/proceedings/2019/762","pdf":"https://ijcai.org/proceedings/2019/0762.pdf","markdown":"https://ijcai.org/proceedings/2019/762.md","bibtex":"https://ijcai.org/proceedings/2019/bibtex/762","volume":{"slug":"2019","title":"Proceedings of the Twenty-Eighth International Joint Conference on Artificial Intelligence","short_title":"IJCAI 2019","url":"https://ijcai.org/proceedings/2019/","year":2019,"location":"Macao","dates":"10-16 August 2019","editors":"Sarit Kraus","isbn":"978-0-9992411-4-1","publisher":"International Joint Conferences on Artificial Intelligence Organization","doi_prefix":"10.24963/ijcai.2019"},"section":"Natural Language Processing","track":"Main track","number":762,"pages":{"first":5485,"last":5491},"keywords":["Machine Learning: Classification","Natural Language Processing: Sentiment Analysis and Text Mining"],"videos":[],"references":[{"position":1,"raw":"[Chen et al., 2017] Peng Chen, Zhongqian Sun, Lidong Bing, and Wei Yang. 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