arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2209.00876cs.CL
收藏

基于离线强化学习的对话评价

Dialogue Evaluation with Offline Reinforcement Learning

Heinrich Heine University Düsseldorf(杜塞尔多夫海因里希·海涅大学)

Nurul Lubis, Christian Geishauser, Hsien-Chin Lin, Carel van Niekerk, Michael Heck, Shutong Feng, Milica Gašić

摘要:

面向任务的对话系统旨在通过自然语言交互实现用户目标。理想情况下,它们是由人类用户进行评估的,但是在开发阶段的每个迭代中都无法实现。模拟用户可能是一个替代方案,但他们的发展是不平凡的。因此,研究人员求助于现有的人与人之间的语料库,这是更实用,更容易复制的离线指标。不幸的是,它们在反映对话系统的真实性能方面是有限的。例如,BLEU与人类判断的相关性很差,现有的基于语料库的指标(如成功率)忽略了对话上下文的不匹配。仍然需要一个可靠的度量面向任务的系统,具有良好的泛化能力和与人类判断的强相关性。在本文中,我们提出了使用离线强化学习的对话评估的基础上的静态语料库。这样的评估器通常被称为批评者,并用于策略优化。我们更进一步,表明离线RL评论家可以在静态语料库上训练任何对话系统作为外部评估者,允许在各种类型的系统之间进行对话性能比较。这种方法的好处是语料库和模型独立,同时实现与人类判断的强相关性,我们通过交互式用户试验证实。

英文摘要:

Task-oriented dialogue systems aim to fulfill user goals through natural language interactions. They are ideally evaluated with human users, which however is unattainable to do at every iteration of the development phase. Simulated users could be an alternative, however their development is nontrivial. Therefore, researchers resort to offline metrics on existing human-human corpora, which are more practical and easily reproducible. They are unfortunately limited in reflecting real performance of dialogue systems. BLEU for instance is poorly correlated with human judgment, and existing corpus-based metrics such as success rate overlook dialogue context mismatches. There is still a need for a reliable metric for task-oriented systems with good generalization and strong correlation with human judgements. In this paper, we propose the use of offline reinforcement learning for dialogue evaluation based on a static corpus. Such an evaluator is typically called a critic and utilized for policy optimization. We go one step further and show that offline RL critics can be trained on a static corpus for any dialogue system as external evaluators, allowing dialogue performance comparisons across various types of systems. This approach has the benefit of being corpus- and model-independent, while attaining strong correlation with human judgements, which we confirm via an interactive user trial.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑