Hierarchical Word Structure-based Parsing: A Feasibility Study on UD-style Dependency Parsing in Japanese

Takaaki Tanaka, Katsuhiko Hayashi, Masaaki Nagata

Abstract
In applying word-based dependency parsing such as Universal Dependencies (UD) to Japanese, the uncertainty of word segmentation emerges for defining a word unit of the dependencies. We introduce the following hierarchical word structures to dependency parsing in Japanese: morphological units (a short unit word, SUW) and syntactic units (a long unit word, LUW). An SUW can be used to segment a sentence consistently, while it is too short to represent syntactic construction. An LUW is a unit including functional multiwords and LUW-based analysis facilitates the capturing of syntactic structure and makes parsing results more precise than SUW-based analysis. This paper describes the results of a feasibility study on the ability and the effectiveness of parsing methods based on hierarchical word structure (LUW chunking+parsing) in comparison to single layer word structure (SUW parsing). We also show joint analysis of LUW-chunking and dependency parsing improves the performance of identifying predicate-argument structures, while there is not much difference between overall results of them. not much difference between overall results of them.
Anthology ID:
W17-6308
Volume:
Proceedings of the 15th International Conference on Parsing Technologies
Month:
September
Year:
2017
Address:
Pisa, Italy
Venue:
IWPT
SIG:
SIGPARSE
Publisher:
Association for Computational Linguistics
Note:
Pages:
56–60
Language:
URL:
https://aclanthology.org/W17-6308
DOI:
Bibkey:
Cite (ACL):
Takaaki Tanaka, Katsuhiko Hayashi, and Masaaki Nagata. 2017. Hierarchical Word Structure-based Parsing: A Feasibility Study on UD-style Dependency Parsing in Japanese. In Proceedings of the 15th International Conference on Parsing Technologies, pages 56–60, Pisa, Italy. Association for Computational Linguistics.
Cite (Informal):
Hierarchical Word Structure-based Parsing: A Feasibility Study on UD-style Dependency Parsing in Japanese (Tanaka et al., IWPT 2017)
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PDF:
https://preview.aclanthology.org/auto-file-uploads/W17-6308.pdf
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Universal Dependencies
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