基于递归神经网络的语音识别快速解码算法

张舸; 张鹏远; 潘接林; 颜永红

doi:10.11999/JEIT160543

基于递归神经网络的语音识别快速解码算法

doi: 10.11999/JEIT160543

基金项目:

国家自然科学基金(U1536117, 11590770-4)，国家重点研发计划重点专项(2016YFB0801200, 2016YFB0801203)，新疆维吾尔自治区科技重大专项(2016A03007-1)

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- 被引次数: 0
出版历程
- 收稿日期: 2016-05-26
- 修回日期: 2017-01-09
- 刊出日期: 2017-04-19

Fast Decoding Algorithm for Automatic Speech Recognition Based on Recurrent Neural Networks

Funds:

The National Natural Science Foundation of China (U1536117, 11590770-4), The National Key Research and Development Plan of China (2016YFB0801200, 2016YFB0801203), The Key Science and Technology Project of the Xinjiang Uygur Autonomous Region (2016A03007-1)

摘要

摘要: 递归神经网络(Recurrent Neural Network, RNN)如今已经广泛用于自动语音识别(Automatic Speech Recognition, ASR)的声学建模。虽然其较传统的声学建模方法有很大优势，但相对较高的计算复杂度限制了这种神经网络的应用，特别是在实时应用场景中。由于递归神经网络采用的输入特征通常有较长的上下文，因此利用重叠信息来同时降低声学后验和令牌传递的时间复杂度成为可能。该文介绍了一种新的解码器结构，通过有规律抛弃存在重叠的帧来获得解码过程中的计算开销降低。特别地，这种方法可以直接用于原始的递归神经网络模型，只需对隐马尔可夫模型(Hidden Markov Model, HMM)结构做小的变动，这使得这种方法具有很高的灵活性。该文以时延神经网络为例验证了所提出的方法，证明该方法能够在精度损失相对较小的情况下取得2~4倍的加速比。
- 语音识别 /
- 递归神经网络 /
- 解码器 /
- 跳帧计算
Abstract: Recurrent Neural Networks (RNN) are widely used for acoustic modeling in Automatic Speech Recognition (ASR). Although RNNs show many advantages over traditional acoustic modeling methods, the inherent higher computational cost limits its usage, especially in real-time applications. Noticing that the features used by RNNs usually have relatively long acoustic contexts, it is possible to lower the computational complexity of both posterior calculation and token passing process with overlapped information. This paper introduces a novel decoder structure that drops the overlapped acoustic frames regularly, which leads to a significant computational cost reduction in the decoding process. Especially, the new approach can directly use the original RNNs with minor modifications on the HMM topology, which makes it flexible. In experiments on conversation telephone speech datasets, this approach achieves 2 to 4 times speedup with little relative accuracy reduction.
- Speech recognition /
- Recurrent Neural Network (RNN) /
- Decoder /
- Frame skipping

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参考文献(18)

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