[scikit-learn] Scaling model selection on a cluster

[Gael Varoquaux]

Parallel computing in scikit-learn is built upon on joblib. In the
development version of scikit-learn, the included joblib can be extended
with a distributed backend:
http://distributed.readthedocs.io/en/latest/joblib.html
that can distribute code on a cluster.

This is still bleeding edge, but this is probably a direction that will
see more development.