Constructing a robust dialogue system on spoken conversations bring more challenge than written conversation. In this respect, DSTC10-Track2-Task2 is proposed, which aims to build a task-oriented dialogue (TOD) system incorporating unstructured external knowledge on a spoken conversation, extending DSTC9-Track1. This paper introduces our system containing four advanced methods: data construction, weighted negative sampling, post-training, and style transfer. We first automatically construct a large training data because DSTC10-Track2 does not release the official training set. For the knowledge selection task, we propose weighted negative sampling to train the model more fine-grained manner. We also employ post-training and style transfer for the response generation task to generate an appropriate response with a similar style to the target response. In the experiment, we investigate the effect of weighted negative sampling, post-training, and style transfer. Our model ranked 7 out of 16 teams in the objective evaluation and 6 in human evaluation.

本文旨在构建一个具有鲁棒性的口语对话系统，通过引入未结构化的外部知识和采用数据构建、加权负采样、后训练以及风格转换等四种高级方法，完成了DSTC10-Track2-Task2的任务，实验表明我们的模型在客观评估中排名第7，人工评估中排名第6。

在基于知识的任务导向对话系统中采用加权负采样进行外部知识选择