Dataset Summary

mMARCO is a multilingual version of the MS MARCO passage ranking dataset. For more information, checkout our papers:

There are two translated versions of mMARCO.

v1 In v1 version, we use MarianNMT an open-source neural machine translation framework made available by the Language Technology Research Group at the University of Helsinki for more than a thousand language pairs for translation. This version comprises 8 languages: Chinese, French, German, Indonesian, Italian, Portuguese, Russian and Spanish. In the paper, we refer to these models as "Helsinki".
v2 (Recommended) In v2 version, we use Google Translate to translate the dataset. In this commercial translation version, besides the 8 languages from v1, we add other 5 languages: Japanese, Dutch, Vietnamese, Hindi and Arabic.

Supported languages

Language name	Language code	v1	v2
English	english	✓	✓
Chinese	chinese	✓	✓
French	french	✓	✓
German	german	✓	✓
Indonesian	indonesian	✓	✓
Italian	italian	✓	✓
Portuguese	portuguese	✓	✓
Russian	russian	✓	✓
Spanish	spanish	✓	✓
Arabic	arabic		✓
Dutch	dutch		✓
Hindi	hindi		✓
Japanese	japanese		✓
Vietnamese	vietnamese		✓

Dataset Structure

You can load mMARCO dataset by choosing a specific language. We include training triples (query, positive and negative example), the translated collections of documents and queries.

Training triples

>>> dataset = load_dataset('unicamp-dl/mmarco', 'english')
>>> dataset['train'][1]
{'query': 'what fruit is native to australia', 'positive': 'Passiflora herbertiana. A rare passion fruit native to Australia. Fruits are green-skinned, white fleshed, with an unknown edible rating. Some sources list the fruit as edible, sweet and tasty, while others list the fruits as being bitter and inedible.assiflora herbertiana. A rare passion fruit native to Australia. Fruits are green-skinned, white fleshed, with an unknown edible rating. Some sources list the fruit as edible, sweet and tasty, while others list the fruits as being bitter and inedible.', 'negative': 'The kola nut is the fruit of the kola tree, a genus (Cola) of trees that are native to the tropical rainforests of Africa.'}

Queries

>>> dataset = load_dataset('unicamp-dl/mmarco', 'queries-spanish')
>>> dataset['train'][1]
{'id': 634306, 'text': '¿Qué significa Chattel en el historial de crédito'}

Collection

>>> dataset = load_dataset('unicamp-dl/mmarco', 'collection-portuguese')
>>> dataset['collection'][100]
{'id': 100, 'text': 'Antonín Dvorák (1841-1904) Antonin Dvorak era filho de açougueiro, mas ele não seguiu o negócio de seu pai. Enquanto ajudava seu pai a meio tempo, estudou música e se formou na Escola de Órgãos de Praga em 1859.'}

Citation Information

@misc{bonifacio2021mmarco,
      title={mMARCO: A Multilingual Version of MS MARCO Passage Ranking Dataset}, 
      author={Luiz Henrique Bonifacio and Vitor Jeronymo and Hugo Queiroz Abonizio and Israel Campiotti and Marzieh Fadaee and  and Roberto Lotufo and Rodrigo Nogueira},
      year={2021},
      eprint={2108.13897},
      archivePrefix={arXiv},
      primaryClass={cs.CL}
}