As part of the FAIR No Language Left Behind (NLLB) (Paper, Website, Blog) project to drive inclusion through machine translation, a large amount of data was processed to create training data. We provide the libraries and tools we used to:

1. create clean monolingual data from web data
2. mine bitext
3. easily write scalable pipelines for processing data for machine translation

Full documentation on https://facebookresearch.github.io/stopes

checkout the demo directory for an example usage with the WMT22 Shared Task: Large-Scale Machine Translation Evaluation for African Languages data.

stopes relies on:

• submitit to schedule jobs when ran on clusters
• hydra-core version >= 1.2.0 for configuration
• fairseq to use LASER encoders
• PyTorch version >= 1.5.0
• Python version >= 3.8

stopes uses flit to manage its setup, you will need a recent version of pip for the install to work. We recommend that you first upgrade pip: python -m pip install --upgrade pip

The mining pipeline relies on fairseq to run LASER encoders, because of competing dependency version, you'll have to first install fairseq with pip separately:

pip install fairseq==0.12.1

You can then install stopes with pip:

cd ..
git clone https://github.com/facebookresearch/stopes.git
cd stopes
pip install -e '.[dev,mono,mining]'

You can choose what to install. If you are only interested in mining, you do not need to install dev, and mono. If you are interested in the distillation pipeline, you will need to install at least mono. mining will install the cpu version of the dependencies for mining, if you want to do mining on gpu, and your system is compatible, you can install [mining,mining-gpu].

Currently fairseq and stopes require different version of hydra, so pip might output some warnings, do not worry about them, we want hydra>=1.1.

If you plan to train a lot of NMT model you will also want to setup apex to get a faster training.

git clone https://github.com/NVIDIA/apex
cd apex
pip install -v --no-cache-dir --global-option="--cpp_ext" --global-option="--cuda_ext" \
  --global-option="--deprecated_fused_adam" --global-option="--xentropy" \
  --global-option="--fast_multihead_attn" ./

stopes is made of a few different parts:

1. core provides a library to write readable piplines
2. modules provides a set of modules using the core library and implementing common steps in our mining and evaluation pipelines
3. pipelines provides pipeline implementation for the data pipelines we use in NLLB:

• monolingual to preprocess and clean single language data
• bitext to run the "global mining" pipeline and extract aligned sentences from two monolingual datasets. (inspired by CCMatric)
• distilation to run our sequence-level knowledge distillation pipeline which trains a small student model from a pre-trained large teacher model (approach based on https://arxiv.org/abs/1606.07947)

Full documentation: see https://facebookresearch.github.io/stopes or the websites/docs folder.

See the CONTRIBUTING file for how to help out.

• Pierre Andrews
• Onur Çelebi
• Angela Fan
• Vedanuj Goswami
• Alex Guo
• Kevin Heffernan
• Ammar Kamran
• Jean Maillard
• Alexandre Mourachko
• Kaushik Ram Sadagopan
• Holger Schwenk
• Guillaume Wenzek

(in alphabetical order)

If you use stopes in your work or any models/datasets/artifacts published in NLLB, please cite :

@article{nllb2022,
  title={No Language Left Behind: Scaling Human-Centered Machine Translation},
  author={{NLLB Team} and Costa-jussà, Marta R. and Cross, James and Çelebi, Onur and Elbayad, Maha and Heafield, Kenneth and Heffernan, Kevin and Kalbassi, Elahe and Lam, Janice and Licht, Daniel and Maillard, Jean and Sun, Anna and Wang, Skyler and Wenzek, Guillaume and Youngblood, Al and Akula, Bapi and Barrault, Loic and Mejia-Gonzalez, Gabriel and Hansanti, Prangthip and Hoffman, John and Jarrett, Semarley and Sadagopan, Kaushik Ram and Rowe, Dirk and Spruit, Shannon and Tran, Chau and Andrews, Pierre and Ayan, Necip Fazil and Bhosale, Shruti and Edunov, Sergey and Fan, Angela and Gao, Cynthia and Goswami, Vedanuj and Guzmán, Francisco and Koehn, Philipp and Mourachko, Alexandre and Ropers, Christophe and Saleem, Safiyyah and Schwenk, Holger and Wang, Jeff},
  year={2022}
}

stopes is MIT licensed, as found in the LICENSE file.