While many speakers of low-resource languages regularly code-switch between
their languages and other regional languages or English, datasets of
codeswitched speech are too small to train bespoke acoustic models from scratch
or do language model rescoring. Here we propose finetuning self-supervised
speech representations such as wav2vec 2.0 XLSR to recognize code-switched
data. We find that finetuning self-supervised multilingual representations and
augmenting them with n-gram language models trained from transcripts reduces
absolute word error rates by up to 20% compared to baselines of hybrid models
trained from scratch on code-switched data. Our findings suggest that in
circumstances with limited training data finetuning self-supervised
representations is a better performing and viable solution.

利用自监督语音表示的微调和利用转录训练的 n-gram 语言模型增强多语言表示，相对于从头开始训练的混合模型，将代码切换数据的绝对词错误率降低了高达 20%。研究结果表明，在训练数据受限的情况下，微调自监督表示是一种更优秀和可行的解决方案。

多语言自学习语音表示改进资源有限的非洲语种混杂语音识别

Multilingual self-supervised speech representations improve the speech  recognition of low-resource African languages with codeswitching

We describe Microsoft's conversational speech recognition system, in which we
combine recent developments in neural-network-based acoustic and language
modeling to advance the state of the art on the Switchboard recognition task.
Inspired by machine learning ensemble techniques, the system uses a range of
convolutional and recurrent neural networks. I-vector modeling and lattice-free
MMI training provide significant gains for all acoustic model architectures.
Language model rescoring with multiple forward and backward running RNNLMs, and
word posterior-based system combination provide a 20% boost. The best single
system uses a ResNet architecture acoustic model with RNNLM rescoring, and
achieves a word error rate of 6.9% on the NIST 2000 Switchboard task. The
combined system has an error rate of 6.2%, representing an improvement over
previously reported results on this benchmark task.

本文介绍 Microsoft 的会话式语音识别系统，其中采用了近期发展的基于神经网络的声学和语言建模技术，结合机器学习集成技术，使用了多种卷积和循环神经网络，通过 i-vector 模型建模和不带晶格的 MMI 训练，在声学建模架构的所有方面都提供了显著的增益率，使用多个前向和后向运行的 RNNLM 进行语言模型重新加权以及基于词后概率的系统组合，提高了 20％. 最佳单一系统使用 ResNet 架构声学模型与 RNNLM 重新加权，可在 NIST 2000 Switchboard 任务上实现 6.9％的词错误率。 结合系统的误差率为 6.2％，这是对此基准测试中以前报告的结果的改进。