Recent advancements in reference-free learned metrics for open-domain dialogue evaluation have been driven by the progress in pre-trained language models and the availability of dialogue data with high-quality human annotations. However, current studies predominantly concentrate on English dialogues, and the generalization of these metrics to other languages has not been fully examined. This is largely due to the absence of a multilingual dialogue evaluation benchmark. To address the issue, we introduce xDial-Eval, built on top of open-source English dialogue evaluation datasets. xDial-Eval includes 12 turn-level and 6 dialogue-level English datasets, comprising 14930 annotated turns and 8691 annotated dialogues respectively. The English dialogue data are extended to nine other languages with commercial machine translation systems. On xDial-Eval, we conduct comprehensive analyses of previous BERT-based metrics and the recently-emerged large language models. Lastly, we establish strong self-supervised and multilingual baselines. In terms of average Pearson correlations over all datasets and languages, the best baseline outperforms OpenAI's ChatGPT by absolute improvements of 6.5% and 4.6% at the turn and dialogue levels respectively, albeit with much fewer parameters. The data and code are publicly available at https://github.com/e0397123/xDial-Eval.

使用预训练语言模型和高质量标注的对话数据，最近关于开放域对话评估的无参考学习测量的进展主要集中在英文对话上，对这些测量指标在其他语言上的泛化性还没有得到充分研究。因此，为了解决这个问题，我们引入了一个基于英文对话评估数据集的xDial-Eval来进行多语言对话评估基准测试，并建立了自监督和多语言基线模型。与OpenAI的ChatGPT相比，最好的基线模型在所有数据集和语言上的平均Pearson相关系数分别提升了6.5%和4.6%，同时具有更少的参数。

xDial-Eval: 多语言开放领域对话评估基准