PIP install rasa-x takes forever

Question

I am intalling Rasa X in a Python 3.7 conda environment on Windows 10. pip version is 20.3.3.

pip3 install rasa-x --extra-index-url https://pypi.rasa.com/simple

It have been going on for 5-6 hours and seems to be confused:

Any idea what I can do to fix this?

Answer 1

It is caused by the dependency resolution backtracking logic introduced in pip v20.3. (docs)

A fix for now is to downgrade pip to v20.2, with:

pip install --upgrade pip==20.2

Answer 2

Instead of downgrading pip you can also use the old dependency resolver until pip 21.0 ships (that's when they strip the old resolver from the code base), like so:

pip3 install --use-deprecated=legacy-resolver rasa-x --extra-index-url https://pypi.rasa.com/simple