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In Natural Languages Processing, there are lots of syntax trees corresponding to an input sentence. If we can choose the correct syntax tree meaningfully, the quality of the processing is improved. We... proposed the method of building the dependency constraint into a context free grammar by subdividing nonterminals according to the meaning of the phrase generated from the nonterminal and by grasping production rules from superordinate-subordinate relation of their meanings in the thesaurus. This paper shows estimation of the PCFG building the Dependency Constraint by the experiment of disambiguating which of N_2 or N_3 governs N_1 in the noun phrase "N_1のN_2のN_3".show more
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