NLP

Deep Context- and Relation-Aware Learning for Aspect-based Sentiment Analysis

오신혁(넷마블), 이동엽(카카오), 황태선(고려대학교), 박일남(카카오엔터프라이즈), 서가은(카카오엔터프라이즈), 김응균(카카오엔터프라이즈), 김학수(건국대학교)

ACL-IJCNLP Main Conference

2021-08-01

Abstract

Existing works for aspect-based sentiment analysis (ABSA) have adopted a unified approach, which allows the interactive relations among subtasks. However, we observe that these methods tend to predict polarities based on the literal meaning of aspect and opinion terms and mainly consider relations implicitly among subtasks at the word level. In addition, identifying multiple aspect–opinion pairs with their polarities is much more challenging. Therefore, a comprehensive understanding of contextual information w.r.t. the aspect and opinion is further required in ABSA. In this paper, we propose Deep Contextualized Relation-Aware Network (DCRAN), which allows interactive relations among subtasks with deep contextual information based on two modules (i.e., Aspect and Opinion Propagation and Explicit Self-Supervised Strategies). Especially, we design novel self-supervised strategies for ABSA, which have strengths in dealing with multiple aspects. Experimental results show that DCRAN significantly outperforms previous state-of-the-art methods by large margins on three widely used benchmarks.