The repository has migrated to https://pimachinelearning.wip.la/simple, and moved to a VPS instead of GitHub Pages. Staging does not exist anymore
Wheels built by PiMachineLearning as a binary repository. This repository is the staging repository, which ensures some stability on the main repository. New wheels get pushed here instead of the main repository, so that the main repository does not recieve broken wheels.
The default pip.conf (located at /etc/pip.conf) on a Raspberry Pi OS might look like
[global]
extra-index-url=https://piwheels.org/simple
To use these wheels, simply change it to
[global]
extra-index-url=https://piwheels.org/simple https://pimachinelearning.github.io/staging/simple