Elan Ding

> git clone https://github.com/scikit-learn-contrib/py-earth.git > cd py-earth > sudo python setup.py install --cythonize Thank you! I am able to install pyearth this way on Ubuntu 20.04 and Python 3.10.

I'm having the same issue using the latest version and resolved by downgrading to `lightning==2.0.9`.