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arXiv 2008.12424eess.AS
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用于自动发音检错的文本条件Transformer

Text-Conditioned Transformer for Automatic Pronunciation Error Detection

Zhan Zhang, Yuehai Wang, Jianyi Yang

摘要:

自动发音检错(APED)在语言学习领域有着重要的作用。对于以往的基于ASR的APED方法,需要将解码结果与目标文本对齐,以便发现错误。然而,由于解码过程和对齐过程是独立的,关于目标文本的先验知识没有被充分利用。在本文中,我们建议使用目标文本作为Transformer主干处理APED任务的额外条件。该方法能够以端到端的方式输出错误状态,并充分考虑输入语音与目标文本之间的关系;同时,由于将目标文本作为解码器输入的条件,因此Transformer在推理阶段采用前馈方式而不是自回归方式,从而能够显著提高实际部署的速度。我们将基于ASR的Transformer设置为基线APED模型,并在L2-Arctic数据集上进行了几次实验。实验结果表明,该方法可以使$F_1$评分指标相对提高8.4%.

英文摘要:

Automatic pronunciation error detection (APED) plays an important role in the domain of language learning. As for the previous ASR-based APED methods, the decoded results need to be aligned with the target text so that the errors can be found out. However, since the decoding process and the alignment process are independent, the prior knowledge about the target text is not fully utilized. In this paper, we propose to use the target text as an extra condition for the Transformer backbone to handle the APED task. The proposed method can output the error states with consideration of the relationship between the input speech and the target text in a fully end-to-end fashion.Meanwhile, as the prior target text is used as a condition for the decoder input, the Transformer works in a feed-forward manner instead of autoregressive in the inference stage, which can significantly boost the speed in the actual deployment. We set the ASR-based Transformer as the baseline APED model and conduct several experiments on the L2-Arctic dataset. The results demonstrate that our approach can obtain 8.4\% relative improvement on the $F_1$ score metric.

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。

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