Context-Guided BERT for Targeted Aspect-Based Sentiment Analysis

Authors

  • Zhengxuan Wu Symbolic Systems Program, Stanford University
  • Desmond C. Ong Department of Information Systems and Analytics, National University of Singapore Institute of High Performance Computing, Agency for Science, Technology, and Research, Singapore

Keywords:

Text Classification & Sentiment Analysis

Abstract

Aspect-based sentiment analysis (ABSA) and Targeted ASBA (TABSA) allow finer-grained inferences about sentiment to be drawn from the same text, depending on context. For example, a given text can have different targets (e.g., neighborhoods) and different aspects (e.g., price or safety), with different sentiment associated with each target-aspect pair. In this paper, we investigate whether adding context to self-attention models improves performance on (T)ABSA. We propose two variants of Context-Guided BERT (CG-BERT) that learn to distribute attention under different contexts. We first adapt a context-aware Transformer to produce a CG-BERT that uses context-guided softmax-attention. Next, we propose an improved Quasi-Attention CG-BERT model that learns a compositional attention that supports subtractive attention. We train both models with pretrained BERT on two (T)ABSA datasets: SentiHood and SemEval-2014 (Task 4). Both models achieve new state-of-the-art results with our QACG-BERT model having the best performance. Furthermore, we provide analyses of the impact of context in the our proposed models. Our work provides more evidence for the utility of adding context-dependencies to pretrained self-attention-based language models for context-based natural language tasks.

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Published

2021-05-18

How to Cite

Wu, Z., & Ong, D. C. (2021). Context-Guided BERT for Targeted Aspect-Based Sentiment Analysis. Proceedings of the AAAI Conference on Artificial Intelligence, 35(16), 14094-14102. Retrieved from https://ojs.aaai.org/index.php/AAAI/article/view/17659

Issue

Section

AAAI Technical Track on Speech and Natural Language Processing III