Background
Installation on Saga
module purge; module load Python/3.7.2-GCCcore-8.2.0
module load OpenMPI/3.1.3-GCC-8.2.0-2.31.1 CUDA/10.0.130 NCCL/2.4.8-CUDA-10.0
/cluster/shared/nlpl/operation/python/initialize --version 0.18.2 horovod
module load GCC/8.2.0-2.31.1 CMake/3.12.1
module load nlpl-tensorflow/1.15.0/3.7 nlpl-horovod/0.18.2/3.7
\rm ~/pip.log; \
HOROVOD_NCCL_HOME=/cluster/software/NCCL/2.4.8-CUDA-10.0 \
HOROVOD_GPU_ALLREDUCE=NCCL python3 -m pip install --no-cache-dir horovod --log ~/pip.log
