---
task_categories:
- text-generation
- fill-mask
language:
- cs
pretty_name: BUT-LCC
size_categories:
- 10B<n<100B
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---
# BUT-LCC Corpus
BUT-LCC (Brno University of Technology Large Czech Collection) is a corpus of Czech texts. It was cleaned using exact deduplication, fuzzy deduplication (using minhashlsh), n-gram language model, and an SVM classifier that filters inappropriate content (we manually labelled).

# <span style="color:blue">Latest Updates</span>
- 06/05/2024 We released small manually annotated [dataset of adult content](https://huggingface.co/datasets/BUT-FIT/adult_content_classifier_dataset). We used classifier trained on this dataset for filtering our corpus.


## Data Sources
<table>
  <thead>
    <tr>
      <th>Part</th>
      <th>GB of text</th>
      <th>GB of titles</th>
      <th>%</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>CulturaX</td>
      <td>157.79</td>
      <td>3.85</td>
      <td>49</td>
    </tr>
    <tr>
      <td>TenTen-cs-2017</td>
      <td>48.97</td>
      <td>0.95</td>
      <td>15</td>
    </tr>
    <tr>
      <td>BUT_Crawl</td>
      <td>25.15</td>
      <td>0.8</td>
      <td>8</td>
    </tr>
    <tr>
      <td>cswiki-20230101</td>
      <td>1.05</td>
      <td>0.01</td>
      <td>0</td>
    </tr>
    <tr>
      <td>historical</td>
      <td>13.47</td>
      <td>0.00</td>
      <td>4</td>
    </tr>
    <tr>
      <td>hplt</td>
      <td>65.55</td>
      <td>3.20</td>
      <td>21</td>
    </tr>
    <tr>
      <td>idnes_comments</td>
      <td>7.38</td>
      <td>0.03</td>
      <td>2</td>
    </tr>
  </tbody>
  <tfoot>
    <tr>
      <td><b>Sum</b></td>
      <td><b>319.36</b></td>
      <td><b>8.84</b></td>
      <td></td>
    </tr>
  </tfoot>
</table>


## Format
The corpus consists of  train and test splits. It uses jsonl format, which means that every sample is JSON on its own line.

### Sample Format

```json
{
  "id": unique identifier, 		
  "part": original source, 
  "title": source document title, 
  "text": the context,
  "ugly": (type: bool) inappropriate content,
  "ugly_score": (type: float) score from SVM classifier that filters inappropriate content
}
```
# License Information
- We do not own any of the text from which these text data has been extracted.
- We license the actual packaging of these text data under the Creative Commons CC0 license ("no rights reserved").

Detailed licensing information for contained corpora (not crawled by us) is below.

| Corpus | Licensing Information|
|-----------------|----------------|
| CulturaX        | [uonlp/CulturaX](https://huggingface.co/datasets/uonlp/CulturaX#license-information)         |
| TenTen-cs-2017  | [NLP Centre Web Corpus License Agreement](https://lindat.mff.cuni.cz/repository/xmlui/handle/11234/1-4835)        |
| Czech Wikipedia | [CC BY-SA 4.0 DEED](https://creativecommons.org/licenses/by-sa/4.0/deed.en)        |
| Historical      | OCR'd documents since 1850, publicly available from the [Czech Digital Library](https://www.digitalniknihovna.cz/)     |
| HPLT            | [https://hplt-project.org/datasets/v1.2](https://hplt-project.org/datasets/v1.2)      |

## Our Models Linked to This Dataset
- [BUT-FIT/CSMPT7B](https://huggingface.co/BUT-FIT/csmpt7b)
- [BUT-FIT/CSTinyLlama-1.2B](https://huggingface.co/BUT-FIT/CSTinyLlama-1.2B)
- [BUT-FIT/Czech-GPT-2-XL-133k](https://huggingface.co/BUT-FIT/Czech-GPT-2-XL-133k)

## Statistics

<table>
  <thead>
    <tr>
      <th>Split</th>
      <th>Samples</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Train</td>
      <td>176 780 582</td>
    </tr>
    <tr>
      <td>Test</td>
      <td>20 000</td>
    </tr>
  </tbody>

</table>

## ID 2 URL mapping
If you need to recover original webpages, we provide ID to source URL mapping where possible in id2url.csv file.

# Acknowledgement
This work was supported by NAKI III program of  Ministry of Culture Czech Republic, project semANT --- 
"Sémantický průzkumník textového kulturního dědictví" grant no. `DH23P03OVV060` and
by the Ministry of Education, Youth and Sports of the Czech Republic through the e-INFRA CZ (ID:`90254`).

# Contributors
- [Jan Doležal](https://www.fit.vut.cz/person/idolezal/.en) developed cleaning pipeline for text processing, collected data for cleaning, and analyzed cutoff threshold for pruning.
- [Martin Dočkal](https://www.fit.vut.cz/person/idocekal/.en) uploaded data to Huggingface, and helped with cutoff analysis.
- [Martin Fajčík](https://mfajcik.github.io/) reviewed existing corpora, planned pipeline steps, processed data for LM training, and verified their usefullness.
- [Martin Kišš](https://www.fit.vut.cz/person/ikiss/.en) downloaded historical documents, and ran our PeroOCR on the collection.
- [Karel Beneš](https://www.fit.vut.cz/person/ibenes/.en) performed cleaning of historical documents, and created n-gram lm for document filtering.
- [Karel Ondřej](https://www.fit.vut.cz/person/ondrej/.en) who wrote a crawler for collecting BUT_Crawl and prepared preliminary clean corpus version.
- [Michal Hradiš](https://www.fit.vut.cz/person/ihradis/.en) managed the work, and pushed the members when necessary.