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Morality in dialogue systems has raised great attention in research recently.A moral dialogue system aligned with users' values could enhance conversationengagement and user connections. In this paper, we propose a framework,MoralDial to train and evaluate moral dialogue systems. In our framework, wefirst explore the communication mechanisms of morality and resolve expressedmorality into three parts, which indicate the roadmap for building a moraldialogue system. Based on that, we design a simple yet effective method:constructing moral discussions between simulated specific users and thedialogue system. The constructed discussions consist of expressing, explaining,revising, and inferring moral views in dialogue exchanges, which makesconversational models learn morality well in a natural manner. Furthermore, wepropose a novel evaluation method under the framework. We evaluate the multipleaspects of morality by judging the relation between dialogue responses andhuman values in discussions, where the multifaceted nature of morality isparticularly considered. Automatic and manual experiments demonstrate that ourframework is promising to train and evaluate moral dialogue systems.

MoralDial: A Framework to Train and Evaluate Moral Dialogue Systems via Moral Discussions