Cross-domain Speech Recognition with Unsupervised Character-level Distribution Matching

• URL: http://arxiv.org/abs/2104.07491v2
• Date: Fri, 16 Apr 2021 02:10:45 GMT
• Title: Cross-domain Speech Recognition with Unsupervised Character-level Distribution Matching
• Authors: Wenxin Hou, Jindong Wang, Xu Tan, Tao Qin, Takahiro Shinozaki
• Abstract summary: We propose CMatch, a Character-level distribution matching method to perform fine-grained adaptation between each character in two domains. Experiments on the Libri-Adapt dataset show that our proposed approach achieves 14.39% and 16.50% relative Word Error Rate (WER) reduction on both cross-device and cross-environment ASR.
• Score: 60.8427677151492
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: End-to-end automatic speech recognition (ASR) can achieve promising performance with large-scale training data. However, it is known that domain mismatch between training and testing data often leads to a degradation of recognition accuracy. In this work, we focus on the unsupervised domain adaptation for ASR and propose CMatch, a Character-level distribution matching method to perform fine-grained adaptation between each character in two domains. First, to obtain labels for the features belonging to each character, we achieve frame-level label assignment using the Connectionist Temporal Classification (CTC) pseudo labels. Then, we match the character-level distributions using Maximum Mean Discrepancy. We train our algorithm using the self-training technique. Experiments on the Libri-Adapt dataset show that our proposed approach achieves 14.39% and 16.50% relative Word Error Rate (WER) reduction on both cross-device and cross-environment ASR. We also comprehensively analyze the different strategies for frame-level label assignment and Transformer adaptations.

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