1) Install the deep learning frame you intend to use Horovod with e.g. pip3 install tensorflow
2) Run the command
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3) Install Horovod with the correct bindings for your framework (these can be found at: https://horovod.readthedocs.io/en/stable/install_include.html) e.g.
HOROVOD_WITH_TENSORFLOW=1 pip install horovod[tensorflow]