Manage MPI dependencies

Note	The Open MPI feature is only available with Domino versions 5.1.1 and later. Previous versions of Domino do not support this feature.

The Domino Open MPI base image contains common dependencies like Pandas and NumPy. You can modify your environments to add additional packages or a specific package version.

You can package and manage dependencies for your MPI-enabled compute environments. This creates flexibility in managing dependencies for individual projects or workloads without shared cluster worker complexities.

To add a new cluster worker, add the appropriate statements in the Docker Instructions section of both the MPI cluster and Open MPI execution environments. For example, to add a particular version of PyTorch or the mpi4py package include the following:

### Optionally specify version if desired
RUN pip install PyTorch==1.9.0
RUN pip install mpi4py