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Top-down Text-Level Discourse Rhetorical Structure Parsing with Bidirectional Representation Learning

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Abstract

Early studies on discourse rhetorical structure parsing mainly adopt bottom-up approaches, limiting the parsing process to local information. Although current top-down parsers can better capture global information and have achieved particular success, the importance of local and global information at various levels of discourse parsing is different. This paper argues that combining local and global information for discourse parsing is more sensible. To prove this, we introduce a top-down discourse parser with bidirectional representation learning capabilities. Existing corpora on Rhetorical Structure Theory (RST) are known to be much limited in size, which makes discourse parsing very challenging. To alleviate this problem, we leverage some boundary features and a data augmentation strategy to tap the potential of our parser. We use two methods for evaluation, and the experiments on the RST-DT corpus show that our parser can primarily improve the performance due to the effective combination of local and global information. The boundary features and the data augmentation strategy also play a role. Based on gold standard elementary discourse units (EDUs), our parser significantly advances the baseline systems in nuclearity detection, with the results on the other three indicators (span, relation, and full) being competitive. Based on automatically segmented EDUs, our parser still outperforms previous state-of-the-art work.

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Authors and Affiliations

  1. School of Computer Science and Technology, Soochow University, Suzhou, 215006, China

    Long-Yin Zhang, Xin Tan, Fang Kong, Pei-Feng Li & Guo-Dong Zhou

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  1. Long-Yin Zhang
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  2. Xin Tan
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  3. Fang Kong
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  4. Pei-Feng Li
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  5. Guo-Dong Zhou
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Correspondence to Fang Kong.

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Zhang, LY., Tan, X., Kong, F. et al. Top-down Text-Level Discourse Rhetorical Structure Parsing with Bidirectional Representation Learning. J. Comput. Sci. Technol. 38, 985–1001 (2023). https://doi.org/10.1007/s11390-022-1167-0

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