OpenNMT travis-ci

Open-Source Neural Machine Translation in Torch

Build Status

OpenNMT: Open-Source Neural Machine Translation

OpenNMT is a full-featured, open-source (MIT) neural machine translation system utilizing the Torch mathematical toolkit.

The system is designed to be simple to use and easy to extend , while maintaining efficiency and state-of-the-art translation accuracy. Features include:

  • Speed and memory optimizations for high-performance GPU training.
  • Simple general-purpose interface, only requires and source/target data files.
  • C++ implementation of the translator for easy deployment.
  • Extensions to allow other sequence generation tasks such as summarization and image captioning.


OpenNMT only requires a vanilla Torch install with few dependencies. Alternatively there is a (CUDA) Docker container.


  • nn
  • nngraph
  • tds
  • penlight

GPU training requires:

  • cunn
  • cutorch

Multi-GPU training additionally requires:

  • threads


OpenNMT consists of three commands:

1) Preprocess the data.

th preprocess.lua -train_src data/src-train.txt -train_tgt data/tgt-train.txt -valid_src data/src-val.txt -valid_tgt data/tgt-val.txt -save_data data/demo

2) Train the model.

th train.lua -data data/demo-train.t7 -save_model model

3) Translate sentences.

th translate.lua -model model_final.t7 -src data/src-test.txt -output pred.txt

See the guide for more details.


Top Contributors

guillaumekln jsenellart-systran srush ctiquet-systran da03 yoonkim DYCSystran jungikim swiseman sebastianGehrmann akuckartz kpu ksslng


-   v0.2.0 zip tar
-   v0.1.0 zip tar