Language Modeling for Code-Switching: Evaluation, Integration of Monolingual Data, and Discriminative Training

Hila Gonen; Yoav Goldberg

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arXiv · 1810.11895

Language Modeling for Code-Switching: Evaluation, Integration of Monolingual Data, and Discriminative Training

Hila Gonen·Yoav Goldberg

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Abstract

We focus on the problem of language modeling for code-switched language, in the context of automatic speech recognition (ASR). Language modeling for code-switched language is challenging for (at least) three reasons: (1) lack of available large-scale code-switched data for training; (2) lack of a replicable evaluation setup that is ASR directed yet isolates language modeling performance from the other intricacies of the ASR system; and (3) the reliance on generative modeling. We tackle these three issues: we propose an ASR-motivated evaluation setup which is decoupled from an ASR system and the choice of vocabulary, and provide an evaluation dataset for English-Spanish code-switching. This setup lends itself to a discriminative training approach, which we demonstrate to work better than generative language modeling. Finally, we explore a variety of training protocols and verify the effectiveness of training with large amounts of monolingual data followed by fine-tuning with small amounts of code-switched data, for both the generative and discriminative cases.

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Hila Gonen, Yoav Goldberg. 2018-10-28. Language Modeling for Code-Switching: Evaluation, Integration of Monolingual Data, and Discriminative Training. https://arxiv.org/abs/1810.11895

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