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I think this example:
http://scikit-learn.org/dev/auto_examples/exercises/plot_cv_diabetes.html#sphx-glr-auto-examples-exercises-plot-cv-diabetes-py
would be a good place to show off cv_results_
We could set refit=False - or not.
(also I feel like we might want to create a helper for the fill-between stuff in the plot module - maybe that's the 1d special case of visualizing grid-search)