As I have announced here:

https://mail.python.org/pipermail/scipy-dev/2020-February/023990.html

we need to find a replacement for rackspace scikit-learn nightly:

https://scikit-learn.org/stable/developers/advanced_installation.html#installing-nightly-builds

This involves changing our Travis cron CI to stop trying to upload to rackspace.

Possible alternatives:

• github release on a dedicated repo in the scikit-learn org (but not really meant to do this)
• github packages (but not yet ready for Python packages)
• Azure Pipelines PyPI Artifacts (untested)