scikit-learn doesn't install from pip

[aaronjoh]

When installing table_clearing with rosdep, I get the following error:
ERROR: the following rosdeps failed to install
pip: command [sudo -H pip install -U scikit-learn] failed
pip: Failed to detect successful installation of [scikit-learn]

Looking at the scikit-learn website, they do not recommend installing from pip http://scikit-learn.org/stable/install.html

Installing with
sudo apt-get install python-sklearn

worked for me.