Umt5 Xxl

🚀 Google's UMT5

UMT5 is a multilingual pre - trained model that uses an updated mC4 corpus, covering 107 languages. It offers a new sampling method, UniMax, for more effective multilingual pretraining.

🚀 Quick Start

UMT5 is pre - trained on an updated version of the mC4 corpus, which covers 107 languages, including Afrikaans, Albanian, Amharic, and many others.

⚠️ Important Note

UMT5 was only pre - trained on mC4 excluding any supervised training. Therefore, this model has to be fine - tuned before it is useable on a downstream task.

✨ Features

• Multilingual Coverage: UMT5 supports 107 languages, making it highly versatile for multilingual tasks.
• New Sampling Method: It uses the UniMax sampling method, which provides more uniform coverage of head languages and mitigates overfitting on tail languages.

📚 Documentation

Abstract

Pretrained multilingual large language models have typically used heuristic temperature - based sampling to balance between different languages. However previous work has not systematically evaluated the efficacy of different pretraining language distributions across model scales. In this paper, we propose a new sampling method, UniMax, that delivers more uniform coverage of head languages while mitigating overfitting on tail languages by explicitly capping the number of repeats over each language's corpus. We perform an extensive series of ablations testing a range of sampling strategies on a suite of multilingual benchmarks, while varying model scale. We find that UniMax outperforms standard temperature - based sampling, and the benefits persist as scale increases. As part of our contribution, we release: (i) an improved and refreshed mC4 multilingual corpus consisting of 29 trillion characters across 107 languages, and (ii) a suite of pretrained umT5 model checkpoints trained with UniMax sampling.

📄 License

This project is licensed under the Apache - 2.0 license.

Additional Information

• Pretraining Dataset: mC4
• Other Community Checkpoints: here
• Paper: UniMax, Fairer and More Effective Language Sampling for Large - Scale Multilingual Pretraining
• Authors: by Hyung Won Chung, Xavier Garcia, Adam Roberts, Yi Tay, Orhan Firat, Sharan Narang, Noah Constant