SEMANTIC LABEL APPLICATION MODEL LEARNING DEVICE, SEMANTIC LABEL APPLICATION DEVICE, SEMANTIC LABEL APPLICATION MODEL LEARNING METHOD AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To apply an appropriate semantic label for a functional expression of a predicate that becomes an interrogative expression or an assertive expression depending on the flow of conversation.SOLUTION: Learning utterance pair creation unit 22 creates an utterance pair for learning on the basis of a correct answer corpus in which correct answer labels of a functional expression and a response expression are applied to respective morpheme analysis results. An initial value of weight is set in a parameter table for each of a plurality of kinds of identities using, as identity, a row of identities which are a semantic label of a functional expression that appears at the end of the former utterance of the utterance pair and a semantic label of a response expression that appears at the beginning of the latter utterance of the utterance pair. A parameter table creation unit 24 establishes a lattice including all candidate semantic labels for each morpheme using morphological information of the utterance pair and a functional expression dictionary 30, and searches a maximum likelihood path from the lattice structure on the basis of the weight for each identity in the parameter table. The weight in the parameter table is learned so that the maximum likelihood path becomes a semantic label string of correct answers.