On 10/23/2013 01:00 PM, Josh Wasserstein wrote:
> Sorry - I figured why the shape of cv_values is (30,3)
>
> But what is the default scoring used by RidgeCV?
None means the scorer of the underlying estimator, so Ridge, which has 
r2 as default, as all regressors do.
This is apparently missing from the docs. PR that explains the meaning 
of "None" or opening an issue welcome.
This is also missing in GridSearchCV (and cross_val_score I guess).

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