# Dataset Card for No Language Left Behind (NLLB - 200vo)
## Table of Contents
- [Table of Contents](#table-of-contents)
- [Dataset Description](#dataset-description)
- [Dataset Summary](#dataset-summary)
- [Supported Tasks and Leaderboards](#supported-tasks-and-leaderboards)
- [Languages](#languages)
- [Dataset Structure](#dataset-structure)
- [Data Instances](#data-instances)
- [Data Fields](#data-fields)
- [Data Splits](#data-splits)
- [Dataset Creation](#dataset-creation)
- [Curation Rationale](#curation-rationale)
- [Source Data](#source-data)
- [Annotations](#annotations)
- [Personal and Sensitive Information](#personal-and-sensitive-information)
- [Considerations for Using the Data](#considerations-for-using-the-data)
- [Social Impact of Dataset](#social-impact-of-dataset)
- [Discussion of Biases](#discussion-of-biases)
- [Other Known Limitations](#other-known-limitations)
- [Additional Information](#additional-information)
- [Dataset Curators](#dataset-curators)
- [Licensing Information](#licensing-information)
- [Citation Information](#citation-information)
- [Contributions](#contributions)
## Dataset Description
- **Homepage:** [Needs More Information]
- **Repository:** [Needs More Information]
- **Paper:** https://arxiv.org/pdf/2207.0467
- **Leaderboard:** [Needs More Information]
- **Point of Contact:** [Needs More Information]
### Dataset Summary
This dataset was created based on [metadata](https://github.com/facebookresearch/fairseq/tree/nllb) for mined bitext released by Meta AI. It contains bitext for 148 English-centric and 1465 non-English-centric language pairs using the stopes mining library and the LASER3 encoders (Heffernan et al., 2022). The complete dataset is ~450GB.
[CCMatrix](https://opus.nlpl.eu/CCMatrix.php) contains previous versions of mined instructions.
#### How to use the data
There are two ways to access the data:
* Via the Hugging Face Python datasets library
For accessing a particular [language pair](https://huggingface.co/datasets/allenai/nllb/blob/main/nllb_lang_pairs.py):
```
from datasets import load_dataset
dataset = load_dataset("allenai/nllb", "ace_Latn-ban_Latn")
```
* Clone the git repo
```
git lfs install
git clone https://huggingface.co/datasets/allenai/nllb
```
### Supported Tasks and Leaderboards
N/A
### Languages
Language pairs can be found [here](https://huggingface.co/datasets/allenai/nllb/blob/main/nllb_lang_pairs.py).
## Dataset Structure
The dataset contains gzipped tab delimited text files for each direction. Each text file contains lines with parallel sentences.
### Data Instances
The number of instances for each language pair can be found in the [dataset_infos.json](https://huggingface.co/datasets/allenai/nllb/blob/main/dataset_infos.json) file.
### Data Fields
Every instance for a language pair contains the following fields: 'translation' (containing sentence pairs), 'laser_score', 'source_sentence_lid', 'target_sentence_lid', where 'lid' is language classification probability, 'source_sentence_source', 'source_sentence_url', 'target_sentence_source', 'target_sentence_url'.
* Sentence in first language
* Sentence in second language
* LASER score
* Language ID score for first sentence
* Language ID score for second sentence
* First sentence source (See [Source Data Table](https://huggingface.co/datasets/allenai/nllb#source-data))
* First sentence URL if the source is crawl-data/\*; _ otherwise
* Second sentence source
* Second sentence URL if the source is crawl-data/\*; _ otherwise
The lines are sorted by LASER3 score in decreasing order.
Example:
```
{'translation': {'ace_Latn': 'Gobnyan hana geupeukeucewa gata atawa geutinggai meunan mantong gata."',
'ban_Latn': 'Ida nenten jaga manggayang wiadin ngutang semeton."'},
'laser_score': 1.2499876022338867,
'source_sentence_lid': 1.0000100135803223,
'target_sentence_lid': 0.9991400241851807,
'source_sentence_source': 'paracrawl9_hieu',
'source_sentence_url': '_',
'target_sentence_source': 'crawl-data/CC-MAIN-2020-10/segments/1581875144165.4/wet/CC-MAIN-20200219153707-20200219183707-00232.warc.wet.gz',
'target_sentence_url': 'https://alkitab.mobi/tb/Ula/31/6/\n'}
```
### Data Splits
The data is not split. Given the noisy nature of the overall process, we recommend using the data only for training and use other datasets like [Flores-200](https://github.com/facebookresearch/flores) for the evaluation. The data includes some development and test sets from other datasets, such as xlsum. In addition, sourcing data from multiple web crawls is likely to produce incidental overlap with other test sets.
## Dataset Creation
### Curation Rationale
Data was filtered based on language identification, emoji based filtering, and for some high-resource languages using a language model. For more details on data filtering please refer to Section 5.2 (NLLB Team et al., 2022).
### Source Data
#### Initial Data Collection and Normalization
Monolingual data was collected from the following sources:
| Name in data | Source |
|------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| afriberta | https://github.com/castorini/afriberta |
| americasnlp | https://github.com/AmericasNLP/americasnlp2021/ |
| bho_resources | https://github.com/shashwatup9k/bho-resources |
| crawl-data/* | WET files from https://commoncrawl.org/the-data/get-started/ |
| emcorpus | http://lepage-lab.ips.waseda.ac.jp/en/projects/meiteilon-manipuri-language-resources/ |
| fbseed20220317 | https://github.com/facebookresearch/flores/tree/main/nllb_seed |
| giossa_mono | https://github.com/sgongora27/giossa-gongora-guarani-2021 |
| iitguwahati | https://github.com/priyanshu2103/Sanskrit-Hindi-Machine-Translation/tree/main/parallel-corpus |
| indic | https://indicnlp.ai4bharat.org/corpora/ |
| lacunaner | https://github.com/masakhane-io/lacuna_pos_ner/tree/main/language_corpus |
| leipzig | Community corpora from https://wortschatz.uni-leipzig.de/en/download for each year available |
| lowresmt2020 | https://github.com/panlingua/loresmt-2020 |
| masakhanener | https://github.com/masakhane-io/masakhane-ner/tree/main/MasakhaNER2.0/data |
| nchlt | https://repo.sadilar.org/handle/20.500.12185/299
https://repo.sadilar.org/handle/20.500.12185/302
https://repo.sadilar.org/handle/20.500.12185/306
https://repo.sadilar.org/handle/20.500.12185/308
https://repo.sadilar.org/handle/20.500.12185/309
https://repo.sadilar.org/handle/20.500.12185/312
https://repo.sadilar.org/handle/20.500.12185/314
https://repo.sadilar.org/handle/20.500.12185/315
https://repo.sadilar.org/handle/20.500.12185/321
https://repo.sadilar.org/handle/20.500.12185/325
https://repo.sadilar.org/handle/20.500.12185/328
https://repo.sadilar.org/handle/20.500.12185/330
https://repo.sadilar.org/handle/20.500.12185/332
https://repo.sadilar.org/handle/20.500.12185/334
https://repo.sadilar.org/handle/20.500.12185/336
https://repo.sadilar.org/handle/20.500.12185/337
https://repo.sadilar.org/handle/20.500.12185/341
https://repo.sadilar.org/handle/20.500.12185/343
https://repo.sadilar.org/handle/20.500.12185/346
https://repo.sadilar.org/handle/20.500.12185/348
https://repo.sadilar.org/handle/20.500.12185/353
https://repo.sadilar.org/handle/20.500.12185/355
https://repo.sadilar.org/handle/20.500.12185/357
https://repo.sadilar.org/handle/20.500.12185/359
https://repo.sadilar.org/handle/20.500.12185/362
https://repo.sadilar.org/handle/20.500.12185/364 |
| paracrawl-2022-* | https://data.statmt.org/paracrawl/monolingual/ |
| paracrawl9* | https://paracrawl.eu/moredata the monolingual release |
| pmi | https://data.statmt.org/pmindia/ |
| til | https://github.com/turkic-interlingua/til-mt/tree/master/til_corpus |
| w2c | https://lindat.mff.cuni.cz/repository/xmlui/handle/11858/00-097C-0000-0022-6133-9 |
| xlsum | https://github.com/csebuetnlp/xl-sum |
#### Who are the source language producers?
Text was collected from the web and various monolingual data sets, many of which are also web crawls. This may have been written by people, generated by templates, or in some cases be machine translation output.
### Annotations
#### Annotation process
Parallel sentences in the monolingual data were identified using LASER3 encoders. (Heffernan et al., 2022)
#### Who are the annotators?
The data was not human annotated.
### Personal and Sensitive Information
Data may contain personally identifiable information, sensitive content, or toxic content that was publicly shared on the Internet.
## Considerations for Using the Data
### Social Impact of Dataset
This dataset provides data for training machine learning systems for many languages that have low resources available for NLP.
### Discussion of Biases
Biases in the data have not been specifically studied, however as the original source of data is World Wide Web it is likely that the data has biases similar to those prevalent in the Internet. The data may also exhibit biases introduced by language identification and data filtering techniques; lower resource languages generally have lower accuracy.
### Other Known Limitations
Some of the translations are in fact machine translations. While some website machine translation tools are identifiable from HTML source, these tools were not filtered out en mass because raw HTML was not available from some sources and CommonCrawl processing started from WET files.
## Additional Information
### Dataset Curators
The data was not curated.
### Licensing Information
The dataset is released under the terms of [ODC-BY](https://opendatacommons.org/licenses/by/1-0/). By using this, you are also bound to the respective Terms of Use and License of the original source.
### Citation Information
Schwenk et al, CCMatrix: Mining Billions of High-Quality Parallel Sentences on the Web. ACL https://aclanthology.org/2021.acl-long.507/
Hefferman et al, Bitext Mining Using Distilled Sentence Representations for Low-Resource Languages. Arxiv https://arxiv.org/abs/2205.12654, 2022.
NLLB Team et al, No Language Left Behind: Scaling Human-Centered Machine Translation, Arxiv https://arxiv.org/abs/2207.04672, 2022.
### Contributions
We thank the NLLB Meta AI team for open sourcing the meta data and instructions on how to use it with special thanks to Bapi Akula, Pierre Andrews, Onur Çelebi, Sergey Edunov, Kenneth Heafield, Philipp Koehn, Alex Mourachko, Safiyyah Saleem, Holger Schwenk, and Guillaume Wenzek. We also thank the AllenNLP team at AI2 for hosting and releasing this data, including Akshita Bhagia (for engineering efforts to host the data, and create the huggingface dataset), and Jesse Dodge (for organizing the connection).