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Exploiting a Large-scale Knowledge Graph for Question Generation in Food Preference Interview Systems

This paper presents a dialogue system that acquires user's food preference through a conversation. First, we proposed a method for selecting relevant topics and generating questions based on Freebase, a large-scale knowledge graph. To select relevant topics, using the Wikipedia corpus, we created a topic-embedding model that represents the correlation among topics. For missing entities in Freebase, knowledge completion was applied using knowledge graph embedding. We incorporated these functions into a dialogue system and conducted a user study. The results reveal that the proposed dialogue system more efficiently elicited words related to food and common nouns, and these words were highly correlated in a word embedding space.