Hi Andy,
thanks for the reply. I guess your second question's ans. is not completely
displayed in the email. Could you please re-post it?
thanks!
S.
On Sun, Feb 22, 2015 at 10:46 PM, Andy <t3k...@gmail.com> wrote:
>
> On 02/22/2015 01:21 PM, shalu jhanwar wrote:
>
> Hi guys,
>
> thanks a lot for all your interesting replies.
>
> i) How can I get threshold value which the classifier has decided to
> take the decision for a particular sample to be in 0 or 1 class in binary
> classification using scikit? The whole purpose of my previous questions
> were to know about that threshold value (either by visualising it or just
> get values)?
>
> That is always 0 for decision_function.
>
>
> ii) Also can I know the threshold values in each iteration which scikit
> used to generate each point on ROC curve using these below lines:
>
> fpr = dict()tpr = dict()roc_auc = dict()for i in range(n_classes):
> fpr[i], tpr[i], _ = roc_curve
> <http://scikit-learn.org/stable/modules/generated/sklearn.metrics.roc_curve.html#sklearn.metrics.roc_curve>(y_test[:,
> i], y_score[:, i])
> roc_auc[i] = auc
> <http://scikit-learn.org/stable/modules/generated/sklearn.metrics.auc.html#sklearn.metrics.auc>(fpr[i],
> tpr[i])
> # Compute micro-average ROC curve and ROC areafpr["micro"], tpr["micro"], _ =
> roc_curve
> <http://scikit-learn.org/stable/modules/generated/sklearn.metrics.roc_curve.html#sklearn.metrics.roc_curve>(y_test.ravel(),
> y_score.ravel())roc_auc["micro"] = auc
> <http://scikit-learn.org/stable/modules/generated/sklearn.metrics.auc.html#sklearn.metrics.auc>(fpr["micro"],
> tpr["micro"])
>
>
> I'm just using this default code, but I would like to know about the
> threshold it uses to generate each point of ROC
>
> The threshold is the third returned value of roc_curve, which you assign
> to _
>
>
> ------------------------------------------------------------------------------
> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
> from Actuate! Instantly Supercharge Your Business Reports and Dashboards
> with Interactivity, Sharing, Native Excel Exports, App Integration & more
> Get technology previously reserved for billion-dollar corporations, FREE
>
> http://pubads.g.doubleclick.net/gampad/clk?id=190641631&iu=/4140/ostg.clktrk
> _______________________________________________
> Scikit-learn-general mailing list
> Scikit-learn-general@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/scikit-learn-general
>
>
------------------------------------------------------------------------------
Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
from Actuate! Instantly Supercharge Your Business Reports and Dashboards
with Interactivity, Sharing, Native Excel Exports, App Integration & more
Get technology previously reserved for billion-dollar corporations, FREE
http://pubads.g.doubleclick.net/gampad/clk?id=190641631&iu=/4140/ostg.clktrk
_______________________________________________
Scikit-learn-general mailing list
Scikit-learn-general@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/scikit-learn-general
