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Guest talk: Wolfgang Maier - LCFRS binarization and debinarization for directional parsing

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In data-driven parsing with Linear Context-Free Rewriting System (LCFRS), markovized grammars are obtained through the annotation of binarization non-terminals during grammar binarization, as in the corresponding work on PCFG parsing. There is, however, indication that directional parsing with a non-binary LCFRS can be faster than parsing with a binary LCFRS.

Since plain (non-binary) treebank grammars do not perform well, I present a debinarization procedure with which we can obtain a non-binary LCFRS from a previously binarized one. The resulting grammar retains the markovization information. The algorithm has been implemented and successfully applied to the German NeGra treebank.

Wolfgang Maier (Düsseldorf)

Date: 2013-11-19 13:15 - 14:15

Location: EDIT Room 3364, E-building, Chalmers (Johanneberg)

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Page updated: 2013-11-11 11:31

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