Article | Proceedings of the Fourth International Conference on Dependency Linguistics (Depling 2017), September 18-20, 2017, Università di Pisa, Italy | Universal Dependencies Are Hard to Parse – Or Are They?
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Title:
Universal Dependencies Are Hard to Parse – Or Are They?
Author:
Ines Rehbein: Leibniz ScienceCampus, Institut für Deutsche Sprache Mannheim, Germany Julius Steen: Leibniz ScienceCampus, Universität Heidelberg, Germany Bich-Ngoc Do: Leibniz ScienceCampus, Universität Heidelberg, Germany Anette Frank: Leibniz ScienceCampus, Universität Heidelberg, Germany
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Full text (pdf)
Year:
2017
Conference:
Proceedings of the Fourth International Conference on Dependency Linguistics (Depling 2017), September 18-20, 2017, UniversitĂ  di Pisa, Italy
Issue:
139
Article no.:
025
Pages:
218-228
No. of pages:
11
Publication type:
Abstract and Fulltext
Published:
2017-09-13
ISBN:
978-91-7685-467-9
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press, Linköpings universitet


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Universal Dependency (UD) annotations, despite their usefulness for cross-lingual tasks and semantic applications, are not optimised for statistical parsing. In the paper, we ask what exactly causes the decrease in parsing accuracy when training a parser on UD-style annotations and whether the effect is similarly strong for all languages. We conduct a series of experiments where we systematically modify individual annotation decisions taken in the UD scheme and show that this results in an increased accuracy for most, but not for all languages. We show that the encoding in the UD scheme, in particular the decision to encode content words as heads, causes an increase in dependency length for nearly all treebanks and an increase in arc direction entropy for many languages, and evaluate the effect this has on parsing accuracy.

Proceedings of the Fourth International Conference on Dependency Linguistics (Depling 2017), September 18-20, 2017, UniversitĂ  di Pisa, Italy

Author:
Ines Rehbein, Julius Steen, Bich-Ngoc Do, Anette Frank
Title:
Universal Dependencies Are Hard to Parse – Or Are They?
References:

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Proceedings of the Fourth International Conference on Dependency Linguistics (Depling 2017), September 18-20, 2017, UniversitĂ  di Pisa, Italy

Author:
Ines Rehbein, Julius Steen, Bich-Ngoc Do, Anette Frank
Title:
Universal Dependencies Are Hard to Parse – Or Are They?
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