Think Before You Speak: Concept-Guided Explicit Persona Reasoning for Personalized Dialogue Generation

It is a critical challenge for open-domain dialogue agents to generate context-coherent responses which can present a consistent personality. However, existing methods mainly focus on the penalty of the persona-inconsistent responses, leaving out considering the context-incoherence problem caused by wrong persona selection. In this paper, we propose the Think-Before-You-Speak (TBYS) model, consisting of Concept-guided Persona Reasoning module and Consistent Dialogue Generation module, to explicitly select persona sentences semantically relevant to the current turn and generate responses based on the selection results. The experimental results on Persona-Chat show that TBYS can generate coherent and consistent responses, outperforming state-of-the-art baselines in both automatic and human evaluations.