| --- |
| language: |
| - en |
| - de |
| - es |
| - fr |
| task_categories: |
| - text-generation |
| pretty_name: MonoWeb Dataset |
| tags: |
| - pretraining |
| - multilingual |
| - monolingual |
| - web-corpus |
| --- |
| |
| # MonoWeb Dataset |
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| MonoWeb is a multilingual pretraining corpus derived from [FineWeb-Edu](https://huggingface.co/datasets/HuggingFaceFW/fineweb-edu) (English) and [FineWeb2](https://huggingface.co/datasets/HuggingFaceFW/fineweb-2) (German, Spanish, French) by systematically removing all mixed-language documents. |
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| Released alongside the paper: |
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| > **[The Role of Mixed-Language Documents for Multilingual Large Language Model Pretraining](https://arxiv.org/pdf/2601.00364)** |
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| ## Dataset Structure |
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| ``` |
| monoweb-dataset/ |
| ├── eng/ # Full English corpus (FineWeb-Edu) |
| ├── deu/ # Full German corpus (FineWeb2) |
| ├── fra/ # Full French corpus (FineWeb2) |
| ├── spa/ # Full Spanish corpus (FineWeb2) |
| ├── finewebedu-en-de-parallel-codeswitch/ # Removed en-de bilingual docs (English side) |
| ├── finewebedu-en-es-parallel-codeswitch/ # Removed en-es bilingual docs (English side) |
| ├── finewebedu-en-fr-parallel-codeswitch/ # Removed en-fr bilingual docs (English side) |
| ├── fineweb2-de-en-parallel-codeswitch/ # Removed en-de bilingual docs (German side) |
| ├── fineweb2-es-en-parallel-codeswitch/ # Removed en-es bilingual docs (Spanish side) |
| └── fineweb2-fr-en-parallel-codeswitch/ # Removed en-fr bilingual docs (French side) |
| ``` |
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| The four folders (`eng`, `deu`, `fra`, `spa`) contain the full source corpora (FineWeb-Edu / FineWeb2), 60B tokens per language (240B total). The `parallel-codeswitch` folders contain the parallel and code-switching documents identified and removed from the full corpus (miscellaneous documents are excluded). The MonoWeb corpus is obtained by excluding the `parallel-codeswitch` documents from the full set. |
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| ## Associated Models |
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| Pretrained models are available at: https://huggingface.co/UCLNLP/monoweb |
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