Can LLMs Really Learn to Translate a Low-Resource Language from One Grammar Book?

• URL: http://arxiv.org/abs/2409.19151v1
• Date: Fri, 27 Sep 2024 21:27:32 GMT
• Title: Can LLMs Really Learn to Translate a Low-Resource Language from One Grammar Book?
• Authors: Seth Aycock, David Stap, Di Wu, Christof Monz, Khalil Sima'an,
• Abstract summary: Extremely low-resource (XLR) languages lack substantial corpora for training NLP models. Machine Translation from One Book suggests prompting long-context LLMs with one grammar book enables English-Kalamang translation. We investigate whether the book's grammatical explanations or its parallel examples are most effective for learning XLR translation.
• Score: 6.905647501099997
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Extremely low-resource (XLR) languages lack substantial corpora for training NLP models, motivating the use of all available resources such as dictionaries and grammar books. Machine Translation from One Book (Tanzer et al., 2024) suggests prompting long-context LLMs with one grammar book enables English-Kalamang translation, an unseen XLR language - a noteworthy case of linguistic knowledge helping an NLP task. We investigate whether the book's grammatical explanations or its parallel examples are most effective for learning XLR translation, finding almost all improvement stems from the parallel examples. Further, we find similar results for Nepali, a seen low-resource language, and achieve performance comparable to an LLM with a grammar book by simply fine-tuning an encoder-decoder translation model. We then investigate where grammar books help by testing two linguistic tasks, grammaticality judgment and gloss prediction, and we explore what kind of grammatical knowledge helps by introducing a typological feature prompt that achieves leading results on these more relevant tasks. We thus emphasise the importance of task-appropriate data for XLR languages: parallel examples for translation, and grammatical data for linguistic tasks. As we find no evidence that long-context LLMs can make effective use of grammatical explanations for XLR translation, we suggest data collection for multilingual XLR tasks such as translation is best focused on parallel data over linguistic description.

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