LSTM-LM with Long-Term History for First-Pass Decoding in Conversational Speech Recognition

• URL: http://arxiv.org/abs/2010.11349v1
• Date: Wed, 21 Oct 2020 23:40:26 GMT
• Title: LSTM-LM with Long-Term History for First-Pass Decoding in Conversational Speech Recognition
• Authors: Xie Chen, Sarangarajan Parthasarathy, William Gale, Shuangyu Chang, Michael Zeng
• Abstract summary: LSTM language models (LSTM-LMs) have been proven to be powerful and yielded significant performance improvements over count based n-gram LMs in modern speech recognition systems. Recent work shows that it is feasible and computationally affordable to adopt the LSTM-LMs in the first-pass decoding within a dynamic (or tree based) decoder framework.
• Score: 27.639919625398
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: LSTM language models (LSTM-LMs) have been proven to be powerful and yielded significant performance improvements over count based n-gram LMs in modern speech recognition systems. Due to its infinite history states and computational load, most previous studies focus on applying LSTM-LMs in the second-pass for rescoring purpose. Recent work shows that it is feasible and computationally affordable to adopt the LSTM-LMs in the first-pass decoding within a dynamic (or tree based) decoder framework. In this work, the LSTM-LM is composed with a WFST decoder on-the-fly for the first-pass decoding. Furthermore, motivated by the long-term history nature of LSTM-LMs, the use of context beyond the current utterance is explored for the first-pass decoding in conversational speech recognition. The context information is captured by the hidden states of LSTM-LMs across utterance and can be used to guide the first-pass search effectively. The experimental results in our internal meeting transcription system show that significant performance improvements can be obtained by incorporating the contextual information with LSTM-LMs in the first-pass decoding, compared to applying the contextual information in the second-pass rescoring.

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