This package isn't pip-worthy (yet) but here are a few options for installation.
Option I: Use the pip
install option (locally)
https://github.com/jejjohnson/eqx-trainer.git
cd eqx-trainer
pip install -e .[dev,all]
Option II: Install it from pip directly.
pip install "git+https://github.com/jejjohnson/eqx-trainer.git"