If you are attempting to install or upgrade packages using "pip install" in a workspace, then you may receive a permission denied error.
!pip install --upgrade scikit-learn
OSError: [Errno 13] Permission denied: '/usr/local/lib/python2.7/dist-packages/scikit-learn'
It's possible to install/upgrade packages in a workspace session, but you need to include the --user flag to avoid the permissions error.
!pip install --upgrade --user scikit-learn
However, this installation will not persist from run to run. If you consistently need this library upgrade, you can install this in a custom environment by following the instructions here.