HiTZ/latxa-corpus-v1.1

Latxa Corpus v1.1

This is the training corpus of Latxa v1.1, a family of large language models for Basque based on Llama 2.

• 💻 Repository: https://github.com/hitz-zentroa/latxa
• 📒 Blog Post: Latxa: An Open Language Model and Evaluation Suite for Basque
• 📖 Paper: Latxa: An Open Language Model and Evaluation Suite for Basque
• 📧 Point of Contact: hitz@ehu.eus

📌 Notice
As of February 13th 2026, this repository reflects a curated version of the original dataset. Some data points have been removed to ensure permission compliance. Researchers with a legitimate need for access to the original data may contact the maintainers for further information.

Dataset Summary

• Curated by: HiTZ Research Center & IXA Research group (University of the Basque Country UPV/EHU)
• Language(s): eu-ES

Latxa's training corpus combines various existing datasets, as well as some new ones that we hereby release. The raw document mix has been deduplicated and processed; here you'll find the final version of the corpus. Our data sources are introduced briefly below. For more details, consult our paper.

• Euscrawl v1.1 ^[new]: An updated version of EusCrawl v1 (Artetxe et al., 2022), including new content up to November 2023.
• Wikipedia: Basque Wikipedia's dump from November 2023.
• CulturaX: The Basque portion of the CulturaX corpus (Nguyen et al., 2023).
• Colossal OSCAR: The Basque portion of several Colossal OSCAR releases.
• HPLT v1: The Basque portion of the HPLT v1 corpus (Aulamo et al., 2023).

For detailed information regarding the licenses associated with each individual corpus comprising this training dataset, please refer to the respective references listed alongside each corpus entry.

Statistics

The size of each dataset in terms of number of documents can be found below:

	Train	Valid	Test
CulturaX	1,283,429	13,096	13,098
EusCrawl v1.1	1,758,084	17,861	17,736
HPLT v1	367,238	3,797	3,699
Colossal OSCAR	233,753	2,483	2,276
Wikipedia	400,902	4,063	4,092

Citation

To cite our work, please use:

@inproceedings{etxaniz-etal-2024-latxa,
    title = "Latxa: An Open Language Model and Evaluation Suite for {B}asque",
    author = "Etxaniz, Julen  and
      Sainz, Oscar  and
      Miguel, Naiara  and
      Aldabe, Itziar  and
      Rigau, German  and
      Agirre, Eneko  and
      Ormazabal, Aitor  and
      Artetxe, Mikel  and
      Soroa, Aitor",
    editor = "Ku, Lun-Wei  and
      Martins, Andre  and
      Srikumar, Vivek",
    booktitle = "Proceedings of the 62nd Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)",
    month = aug,
    year = "2024",
    address = "Bangkok, Thailand",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/2024.acl-long.799/",
    doi = "10.18653/v1/2024.acl-long.799",
    pages = "14952--14972"
}

Acknowledgements

This work is funded by the Basque Government (IKER-GAITU project) and the Ministerio para la Transformación Digital y de la Función Pública - Funded by EU – NextGenerationEU within the framework of the project ILENIA with reference 2022/TL22/00215335.