The recommended way to setup the environemnt for installing GraphCast is to use conda. With conda, you can create an environment and install required libraries with the environment.yml file provided in NCEP folder:
conda env create -f environment.yml -n your-env-name
Activate the environment:
conda activate your-env-name
Get EMC/graphcast source code:
git clone https://github.com/NOAA-EMC/graphcast.git