South African Language Resources: Phrase Chunking

Roald Eiselen


Abstract
Phrase chunking remains an important natural language processing (NLP) technique for intermediate syntactic processing. This paper describes the development of protocols, annotated phrase chunking data sets and automatic phrase chunkers for ten South African languages. Various problems with adapting the existing annotation protocols of English are discussed as well as an overview of the annotated data sets. Based on the annotated sets, CRF-based phrase chunkers are created and tested with a combination of different features, including part of speech tags and character n-grams. The results of the phrase chunking evaluation show that disjunctively written languages can achieve notably better results for phrase chunking with a limited data set than conjunctive languages, but that the addition of character n-grams improve the results for conjunctive languages.
Anthology ID:
L16-1109
Volume:
Proceedings of the Tenth International Conference on Language Resources and Evaluation (LREC'16)
Month:
May
Year:
2016
Address:
Portorož, Slovenia
Editors:
Nicoletta Calzolari, Khalid Choukri, Thierry Declerck, Sara Goggi, Marko Grobelnik, Bente Maegaard, Joseph Mariani, Helene Mazo, Asuncion Moreno, Jan Odijk, Stelios Piperidis
Venue:
LREC
SIG:
Publisher:
European Language Resources Association (ELRA)
Note:
Pages:
689–693
Language:
URL:
https://aclanthology.org/L16-1109
DOI:
Bibkey:
Cite (ACL):
Roald Eiselen. 2016. South African Language Resources: Phrase Chunking. In Proceedings of the Tenth International Conference on Language Resources and Evaluation (LREC'16), pages 689–693, Portorož, Slovenia. European Language Resources Association (ELRA).
Cite (Informal):
South African Language Resources: Phrase Chunking (Eiselen, LREC 2016)
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PDF:
https://aclanthology.org/L16-1109.pdf