In this work, we present a simple and elegant approach to language modeling
for bilingual code-switched text. Since code-switching is a blend of two or
more different languages, a standard bilingual language model can be improved
upon by using structures of the monolingual language models. We propose a novel
technique called dual language models, which involves building two
complementary monolingual language models and combining them using a
probabilistic model for switching between the two. We evaluate the efficacy of
our approach using a conversational Mandarin-English speech corpus. We prove
the robustness of our model by showing significant improvements in perplexity
measures over the standard bilingual language model without the use of any
external information. Similar consistent improvements are also reflected in
automatic speech recognition error rates.

本文提出了一种针对双语混杂文本的语言模型的新方法，即双语言模型，该方法使用单一语言模型的结构来改进标准的双语言模型，并将两个互补的单一语言模型结合在一起，以概率切换模型进行切换。我们使用一种会话式汉英语音语料库评估了该方法的有效性，并证明了我们的模型的鲁棒性，表明在不使用任何外部信息的情况下，在困惑度措施和自动语音识别错误率方面都会显著提高。