arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.14941eess.AScs.SD
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带有逆时针同步波束搜索的流传输Transformer ASR

Streaming Transformer ASR with Blockwise Synchronous Beam Search

Sony Corporation(索尼公司);Johns Hopkins University(约翰斯·霍普金斯大学)

Emiru Tsunoo, Yosuke Kashiwagi, Shinji Watanabe

摘要:

在端到端(E2 E)自动语音识别(ASR)系统中,Transformer自注意网络作为递归神经网络的替代已经显示出有前途的性能。然而,Transformer有一个缺点,即需要整个输入序列来计算自我注意力和源-目标注意力。本文提出了一种基于编码器分块处理的分块同步波束搜索算法来实现流媒体E2 E Transformer ASR。在波束搜索中,使用块边界检测技术同步对齐编码特征块,其中基于序列结束和假设中的重复标记来评估每个预测假设的可靠性得分。HKUST和AISHELL-1普通话,LibriSpeech英语和CSJ日本的任务的评估表明,建议的流Transformer算法优于传统的在线方法,包括单调块注意(MoChA),特别是当使用知识蒸馏技术。一项消融研究表明,我们的流方法有助于减少响应时间,重复标准在某些任务中有显着贡献。我们的流ASR模型在所有考虑的任务中实现了与批处理模型和其他基于流的Transformer方法相当或更高的性能。

英文摘要:

The Transformer self-attention network has shown promising performance as an alternative to recurrent neural networks in end-to-end (E2E) automatic speech recognition (ASR) systems. However, Transformer has a drawback in that the entire input sequence is required to compute both self-attention and source--target attention. In this paper, we propose a novel blockwise synchronous beam search algorithm based on blockwise processing of encoder to perform streaming E2E Transformer ASR. In the beam search, encoded feature blocks are synchronously aligned using a block boundary detection technique, where a reliability score of each predicted hypothesis is evaluated based on the end-of-sequence and repeated tokens in the hypothesis. Evaluations of the HKUST and AISHELL-1 Mandarin, LibriSpeech English, and CSJ Japanese tasks show that the proposed streaming Transformer algorithm outperforms conventional online approaches, including monotonic chunkwise attention (MoChA), especially when using the knowledge distillation technique. An ablation study indicates that our streaming approach contributes to reducing the response time, and the repetition criterion contributes significantly in certain tasks. Our streaming ASR models achieve comparable or superior performance to batch models and other streaming-based Transformer methods in all tasks considered.

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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