https://nvidia.github.io/OpenSeq2Seq/html/installation.html
git clone https://github.com/NVIDIA/OpenSeq2Seq
cd OpenSeq2Seq
pip install -r requirements.txt
Was getting Error Failed building wheel for mpi4py
fixed with sudo apt install libopenmpi-dev
from https://stackoverflow.com/questions/28440834/error-when-installing-mpi4py