On Tue, Oct 23, 2012 at 6:43 PM, Olivier Grisel <[email protected]>wrote:

> I would rather avoid `isinstance` checks to keep our API ducktype
> friendly for 3rd party integration that would not like to use our
> mixins for one reason or another.
>

But GridSearchCV will use the generic `from_estimator` method and users
should directly use the usual metric functions already defined in
sklearn.metrics. So, I don't see the point of adding a third way to call
metrics (and all that extra code) just for the sake of duck-typing.

Mathieu
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