WMT 21 En-X

WMT 21 En-X is a 4.7B multilingual encoder-decoder (seq-to-seq) model trained for one-to-many multilingual translation. It was introduced in this paper and first released in this repository.

The model can directly translate English text into 7 other languages: Hausa (ha), Icelandic (is), Japanese (ja), Czech (cs), Russian (ru), Chinese (zh), German (de).

To translate into a target language, the target language id is forced as the first generated token. To force the target language id as the first generated token, pass the forced_bos_token_id parameter to the generate method.

Note: M2M100Tokenizer depends on sentencepiece, so make sure to install it before running the example.

To install sentencepiece run pip install sentencepiece

Since the model was trained with domain tags, you should prepend them to the input as well.

  • "wmtdata newsdomain": Use for sentences in the news domain
  • "wmtdata otherdomain": Use for sentences in all other domain
from transformers import AutoModelForSeq2SeqLM, AutoTokenizer

model = AutoModelForSeq2SeqLM.from_pretrained("facebook/wmt21-dense-24-wide-en-x")
tokenizer = AutoTokenizer.from_pretrained("facebook/wmt21-dense-24-wide-en-x")

inputs = tokenizer("wmtdata newsdomain One model for many languages.", return_tensors="pt")

# translate English to German
generated_tokens = model.generate(**inputs, forced_bos_token_id=tokenizer.get_lang_id("de"))
tokenizer.batch_decode(generated_tokens, skip_special_tokens=True)
# => "Ein Modell für viele Sprachen."

# translate English to Icelandic
generated_tokens = model.generate(**inputs, forced_bos_token_id=tokenizer.get_lang_id("is"))
tokenizer.batch_decode(generated_tokens, skip_special_tokens=True)
# => "Ein fyrirmynd fyrir mörg tungumál."

See the model hub to look for more fine-tuned versions.

Languages covered

English (en), Hausa (ha), Icelandic (is), Japanese (ja), Czech (cs), Russian (ru), Chinese (zh), German (de)

BibTeX entry and citation info

  title={Facebook AI’s WMT21 News Translation Task Submission},
  author={Chau Tran and Shruti Bhosale and James Cross and Philipp Koehn and Sergey Edunov and Angela Fan},
  booktitle={Proc. of WMT},

Select AutoNLP in the “Train” menu to fine-tune this model automatically.

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