ANSWER SENTENCE SELECTION DEVICE, METHOD, AND PROGRAM

摘要

A theme sentence feature quantity calculation unit 103 calculates the feature quantity F_q of a given theme sentence Q on the basis of a cosine similarity with a feature keyword in a feature keyword database 107b. A positive instance/negative instance determination unit 104 applies the feature quantity F_q to a positive instance/negative instance determination model and determines whether an answer sentence A is positive or negative. An answer sentence score calculation unit 105 calculates a cosine similarity between a plurality of theme sentences paired with the answer sentence A that is determined to be a positive instance and the theme sentence Q, the highest value of the cosine similarity being made the score of the answer sentence A. An answer sentence selection unit 106 selects the answer sentence that indicates the maximum score as an answer sentence to the theme sentence Q.