Hierarchical Macro Discourse Parsing Based on Topic Segmentation

Authors

  • Feng Jiang Soochow University
  • Yaxin Fan Soochow University
  • Xiaomin Chu Soochow University
  • Peifeng Li Soochow University
  • Qiaoming Zhu Soochow University
  • Fang Kong Soochow University

Keywords:

Discourse, Pragmatics & Argument Mining

Abstract

Hierarchically constructing micro (i.e., intra-sentence or inter-sentence) discourse structure trees using explicit boundaries (e.g., sentence and paragraph boundaries) has been proved to be an effective strategy. However, it is difficult to apply this strategy to document-level macro (i.e., inter-paragraph) discourse parsing, the more challenging task, due to the lack of explicit boundaries at the higher level. To alleviate this issue, we introduce a topic segmentation mechanism to detect implicit topic boundaries and then help the document-level macro discourse parser to construct better discourse trees hierarchically. In particular, our parser first splits a document into several sections using the topic boundaries that the topic segmentation detects. Then it builds a smaller and more accurate discourse sub-tree in each section and sequentially forms a whole tree for a document. The experimental results on both Chinese MCDTB and English RST-DT show that our proposed method outperforms the state-of-the-art baselines significantly.

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Published

2021-05-18

How to Cite

Jiang, F., Fan, Y., Chu, X., Li, P., Zhu, Q., & Kong, F. (2021). Hierarchical Macro Discourse Parsing Based on Topic Segmentation. Proceedings of the AAAI Conference on Artificial Intelligence, 35(14), 13152-13160. Retrieved from https://ojs.aaai.org/index.php/AAAI/article/view/17554

Issue

Section

AAAI Technical Track on Speech and Natural Language Processing I