Hi,
On Thu Feb 19 2015 at 10:58:26 PM Andy <t3k...@gmail.com> wrote:
> You give the roc_auc_score the result of "predict". You should give it
> the result of "predict_proba".
>
>
Yes! Thought for me roc_auc_score complains if I pass the result of
predict_proba (wrong shape) but the output of decision_function() works.
Which makes sense. Presumably if you used only the last column of the
predict_proba() output it would also work.
> This came up already quite a bit, not sure how we can avoid people making
> this mistake.
>
>
Not sure either, as soon as I read it I went: "Aahh, yes obviously Tim you
muppet". I do't think there is a good way for roc_auc_score() to
detect/guess that the user is being an idiot and passed a y_score which
contains only two distinct values.
T
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