Rich Character-Level Information for Korean Morphological Analysis and Part-of-Speech Tagging

Andrew Matteson, Chanhee Lee, Youngbum Kim, Heuiseok Lim


Abstract
Due to the fact that Korean is a highly agglutinative, character-rich language, previous work on Korean morphological analysis typically employs the use of sub-character features known as graphemes or otherwise utilizes comprehensive prior linguistic knowledge (i.e., a dictionary of known morphological transformation forms, or actions). These models have been created with the assumption that character-level, dictionary-less morphological analysis was intractable due to the number of actions required. We present, in this study, a multi-stage action-based model that can perform morphological transformation and part-of-speech tagging using arbitrary units of input and apply it to the case of character-level Korean morphological analysis. Among models that do not employ prior linguistic knowledge, we achieve state-of-the-art word and sentence-level tagging accuracy with the Sejong Korean corpus using our proposed data-driven Bi-LSTM model.
Anthology ID:
C18-1210
Volume:
Proceedings of the 27th International Conference on Computational Linguistics
Month:
August
Year:
2018
Address:
Santa Fe, New Mexico, USA
Editors:
Emily M. Bender, Leon Derczynski, Pierre Isabelle
Venue:
COLING
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
2482–2492
Language:
URL:
https://aclanthology.org/C18-1210
DOI:
Bibkey:
Cite (ACL):
Andrew Matteson, Chanhee Lee, Youngbum Kim, and Heuiseok Lim. 2018. Rich Character-Level Information for Korean Morphological Analysis and Part-of-Speech Tagging. In Proceedings of the 27th International Conference on Computational Linguistics, pages 2482–2492, Santa Fe, New Mexico, USA. Association for Computational Linguistics.
Cite (Informal):
Rich Character-Level Information for Korean Morphological Analysis and Part-of-Speech Tagging (Matteson et al., COLING 2018)
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PDF:
https://aclanthology.org/C18-1210.pdf