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home / papers / 2023 / SeaLLMs — Large Language Models for Southeast Asia

SeaLLMs — Large Language Models for Southeast Asia

Paper · 2023 · Xuan-Phi Nguyen, Wenxuan Zhang, Xin Li et al.

Summary

Mainstream LLMs are trained mostly on English. As a result, they handle Southeast Asian languages poorly, especially those written in non-Latin scripts, which standard BPE tokenizers break into very long token sequences. SeaLLMs are open models for Southeast Asian languages, built by adapting English-centric backbones: Llama-2-13B for v1, Mistral-7B for v2, and Gemma-7B for v2.5. Training has four stages:

  1. Continued pre-training on filtered regional web, news and Wikipedia text mixed with high-quality English RedPajama data. For v1 and v2, this uses a vocabulary expanded with pieces taken from the NLLB tokenizer.
  2. A hybrid stage that combines pre-training data with English instruction data.
  3. Supervised fine-tuning on balanced multilingual data, partly synthetic and checked by native speakers, including country-specific safety examples.
  4. DPO alignment on preference pairs that the model labels itself.

The models were evaluated on the new Sea-Bench (GPT-4 as judge), M3Exam, MMLU, GSM8K, MATH and Flores-200. They beat comparable open models and often surpass ChatGPT-3.5, with the largest gains in Thai, Khmer, Lao and Burmese. This makes useful assistants for under-served languages possible at low cost.

Key points

  • The models cover Vietnamese, Chinese, Thai, Indonesian, Khmer, Lao, Malay, Burmese and Tagalog, plus English. Three releases exist: SeaLLM-13B-v1, SeaLLM-7B-v2 and SeaLLM-7B-v2.5.
  • Tokenization cost for Khmer, measured against English with the ChatGPT tokenizer, falls from about 15.6× to about 2.7× with the SeaLLM tokenizer. Gemma's 250K vocabulary needed no expansion.
  • SeaLLM-7B-v2.5 scores 78.5 on GSM8K and 34.9 on MATH in English. On Thai GSM8K it reaches 62.0, against 35.8 for ChatGPT-3.5.
  • SeaLLM-7B-v2 scores 7.54 on English MT-Bench, which is strong for a 7B multilingual model.
  • On Flores-200 (chrF++), SeaLLM-13B-v1 clearly outperforms ChatGPT-3.5 for Lao and Khmer, including direct translation between SEA language pairs.

Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.

 Institutions

Cite

Cite as Xuan-Phi Nguyen, Wenxuan Zhang, Xin Li, Mahani Aljunied, Zhiqiang Hu, Chenhui Shen, Yew Ken Chia, Xingxuan Li, Jianyu Wang, Qingyu Tan, Liying Cheng, Guanzheng Chen, Yue Deng, Sen Yang, Chaoqun Liu, Hang Zhang and Lidong Bing. 2023. SeaLLMs — Large Language Models for Southeast Asia. arXiv:2312.00738.

The paper itself, not this page. BibTeX from the library's record of the work. DOI 10.48550/arxiv.2312.00738 · arXiv 2312.00738

@misc{nguyen2023seallms,
  title = {{SeaLLMs — Large Language Models for Southeast Asia}},
  author = {Xuan-Phi Nguyen, Wenxuan Zhang, Xin Li, Mahani Aljunied, Zhiqiang Hu, Chenhui Shen, Yew Ken Chia, Xingxuan Li, Jianyu Wang, Qingyu Tan, Liying Cheng, Guanzheng Chen, Yue Deng, Sen Yang, Chaoqun Liu, Hang Zhang and Lidong Bing},
  year = {2023},
  doi = {10.48550/arxiv.2312.00738},
  eprint = {2312.00738},
  archivePrefix = {arXiv},
  url = {https://doi.org/10.48550/arxiv.2312.00738}
}

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