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The PyTorch-Kaldi Speech Recognition Toolkit

2018-11-19Code Available1· sign in to hype

Mirco Ravanelli, Titouan Parcollet, Yoshua Bengio

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Abstract

The availability of open-source software is playing a remarkable role in the popularization of speech recognition and deep learning. Kaldi, for instance, is nowadays an established framework used to develop state-of-the-art speech recognizers. PyTorch is used to build neural networks with the Python language and has recently spawn tremendous interest within the machine learning community thanks to its simplicity and flexibility. The PyTorch-Kaldi project aims to bridge the gap between these popular toolkits, trying to inherit the efficiency of Kaldi and the flexibility of PyTorch. PyTorch-Kaldi is not only a simple interface between these software, but it embeds several useful features for developing modern speech recognizers. For instance, the code is specifically designed to naturally plug-in user-defined acoustic models. As an alternative, users can exploit several pre-implemented neural networks that can be customized using intuitive configuration files. PyTorch-Kaldi supports multiple feature and label streams as well as combinations of neural networks, enabling the use of complex neural architectures. The toolkit is publicly-released along with a rich documentation and is designed to properly work locally or on HPC clusters. Experiments, that are conducted on several datasets and tasks, show that PyTorch-Kaldi can effectively be used to develop modern state-of-the-art speech recognizers.

Tasks

Benchmark Results

DatasetModelMetricClaimedVerifiedStatus
LibriSpeech test-cleanLi-GRUWord Error Rate (WER)6.2Unverified
TIMITLSTM + Dropout + BatchNorm + Monophone RegPercentage error14.5Unverified
TIMITGRU + Dropout + BatchNorm + Monophone RegPercentage error14.9Unverified
TIMITRNN + Dropout + BatchNorm + Monophone RegPercentage error15.9Unverified
TIMITLiGRU + Dropout + BatchNorm + Monophone RegPercentage error14.2Unverified
TIMITLi-GRUPercentage error16.3Unverified
TIMITRNNPercentage error16.5Unverified
TIMITGRUPercentage error16.6Unverified
TIMITLSTMPercentage error16Unverified

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