Contradiction expression collection device and computer program therefor

摘要

[Object] An object is to provide a device capable of efficiently collecting contradictory expressions in units smaller than a sentence. [Solution] A contradictory expression collecting device includes: a first-stage contradiction pattern classifying unit extracting a pattern pair consisting of mutually contradictory patterns by machine learning using as training data pattern pairs consisting of patterns in the form of "subject X predicate object Y"; an additional contradiction pattern pair deriving unit 130 deriving a new pattern pair by rewriting one pattern of each extracted pattern pair by using entailment relation; a training data expanding unit for expanding training data by adding to the training data those of the newly derived pattern pairs which are highly likely consisting of mutually contradicting patterns; and an SVM 142 performing a second-stage classification classifying given pattern pairs to pattern pairs consisting of mutually contradictory patterns and to other pairs, based on machine learning using the expanded training data.