A Paradigm Shift in Machine Translation: Boosting Translation Performance of Large Language Models
Authors: Haoran Xu, Young Jin Kim, Amr Sharaf, Hany Hassan Awadalla
AI-generated Key Points
- Significant advancements in various tasks have not fully translated to the translation task for models with moderate sizes
- Previous attempts to improve translation capabilities of moderate-sized language models (LLMs) have had limited success
- The authors propose a novel approach specifically designed for the translation task, eliminating the need for abundant parallel data
- The proposed approach consists of two stages of fine-tuning: initial fine-tuning on monolingual data and subsequent fine-tuning on a small set of high-quality parallel data
- Experimental results show that ALMA, a developed LLM based on LLaMA-2, achieves significant improvements in translation performance across ten directions from test datasets
- ALMA outperforms previous work and even surpasses models with larger parameters like NLLB-54B and GPT-3.5-text-davinci-003
- This study demonstrates that fine-tuning approaches can enhance translation capabilities of moderate-sized LLMs without relying heavily on parallel data
- The proposed method opens up new possibilities for improving machine translation performance using large language models.
Abstract: Generative Large Language Models (LLMs) have achieved remarkable advancements in various NLP tasks. However, these advances have not been reflected in the translation task, especially those with moderate model sizes (i.e., 7B or 13B parameters), which still lag behind conventional supervised encoder-decoder translation models. Previous studies have attempted to improve the translation capabilities of these moderate LLMs, but their gains have been limited. In this study, we propose a novel fine-tuning approach for LLMs that is specifically designed for the translation task, eliminating the need for the abundant parallel data that traditional translation models usually depend on. Our approach consists of two fine-tuning stages: initial fine-tuning on monolingual data followed by subsequent fine-tuning on a small set of high-quality parallel data. We introduce the LLM developed through this strategy as Advanced Language Model-based trAnslator (ALMA). Based on LLaMA-2 as our underlying model, our results show that the model can achieve an average improvement of more than 12 BLEU and 12 COMET over its zero-shot performance across 10 translation directions from the WMT'21 (2 directions) and WMT'22 (8 directions) test datasets. The performance is significantly better than all prior work and even superior to the NLLB-54B model and GPT-3.5-text-davinci-003, with only 7B or 13B parameters. This method establishes the foundation for a novel training paradigm in machine translation.
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