Installation

You will need to install threeML, astromodels and of course gammapy within one Python environment. Thanks to conda this is now pretty straight forward.

Conda/Mamba

conda install -c threeML -c conda-forge gammapy-plugin

Important here is the channel priority as the conda-forge threeML and astromodels packages are not officially suppoorted by the threeML Team. Make sure those packages come from the threeML channel.

PyPi

gammapy-plugin is also available on PyPi and installable via pip. This should take care of all Python dependencies.

pip install gammapy-plugin

Source

If you read this you probably know how this goes:

git clone https://github.com/threeML/gammapy-plugin.git
cd gammapy-plugin
pip install .