| Authors |
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| Publication date |
2009
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| Book title |
Proceedings of the 11th International Conference on Parsing Technologies (IWPT)
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| Event |
11th International Conference on Parsing Technologies (IWPT), Paris, France
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| Pages (from-to) |
214-217
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| Publisher |
Morristown, NJ: Association for Computational Linguistics (ACL)
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| Organisations |
-
Interfacultary Research - Institute for Logic, Language and Computation (ILLC)
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| Abstract |
We present an approach for smoothing treebank-PCFG lexicons by interpolating treebank lexical parameter estimates with estimates obtained from unannotated data via the Inside-outside algorithm. The PCFG has complex lexical categories, making relative-frequency estimates from a treebank very sparse. This kind of smoothing for complex lexical categories results in improved parsing performance, with a particular advantage in identifying obligatory arguments subcategorized by verbs unseen in the treebank.
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| Document type |
Conference contribution
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| Published at |
http://portal.acm.org/citation.cfm?id=1697236.1697278
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