Foster, Jennifer ORCID: 0000-0002-7789-4853 and van Genabith, Josef (2008) Parser evaluation and the BNC: evaluating 4 constituency parsers with 3 metrics. In: LREC 2008 - Sixth International Conference on Language Resources and Evaluation, 28-30 May 2008, Marrakech, Morocco.
Abstract
We evaluate discriminative parse reranking and parser self-training on a new English test set using four versions of the Charniak parser and a variety of parser evaluation metrics. The new test set consists of 1,000 hand-corrected British National Corpus parse trees. We directly evaluate parser output using both the Parseval and the Leaf Ancestor metrics. We also convert the hand-corrected and parser
output phrase structure trees to dependency trees using a state-of-the-art functional tag labeller and constituent-to-dependency conversion tool, and then calculate label accuracy, unlabelled attachment and labelled attachment scores over the dependency structures. We find that reranking leads to a performance improvement on the new test set (albeit a modest one). We find that self-training using BNC data leads to significantly better results. However, it is not clear how effective self-training is when the training material comes from the North American News Corpus.
Metadata
Item Type: | Conference or Workshop Item (Paper) |
---|---|
Event Type: | Conference |
Refereed: | Yes |
Uncontrolled Keywords: | parser; |
Subjects: | Computer Science > Machine translating |
DCU Faculties and Centres: | Research Institutes and Centres > National Centre for Language Technology (NCLT) |
Official URL: | http://www.lrec-conf.org/proceedings/lrec2008/ |
Use License: | This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License |
Funders: | Irish Research Council for Science Engineering and Technology, IRCSET P/04/232, Science Foundation Ireland, SFI 04/IN/1527 |
ID Code: | 15191 |
Deposited On: | 16 Feb 2010 14:17 by DORAS Administrator . Last Modified 10 Oct 2018 15:16 |
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