[scikit-learn] SVM-RFE with scoring = 'f1'

[Malik Yousef]

Can you give me an example?
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*Prof. Malik Yousef , Associate Professor                           *
*Zefat Academic College , Department of Information System  *
Home Page:
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On Thu, Aug 1, 2019 at 5:15 PM Guillaume Lemaître <g.lemaitre58 at gmail.com>
wrote:

> you can use the LabelEncoder then. It will encode the classes for you.
>
> On Thu, 1 Aug 2019 at 23:04, Malik Yousef <malik.yousef at gmail.com> wrote:
>
>> The only string column is the label column(class labels, n.pre, and
>> c.pre). if the scoring = 'accuracy' then it works fine.
>> So I think I need somehow to set up the postive_lable.. that I don't know
>> how to do that.
>>
>>
>> ---------------------------------------------------------------------------------------
>> *Prof. Malik Yousef , Associate Professor                           *
>> *Zefat Academic College , Department of Information System  *
>> Home Page:
>> https://malikyousef.com/
>> Google Scholar Profile :
>> https://scholar.google.com/citations?user=9UCZ_q4AAAAJ&hl=en&oi=ao
>>
>> ----------------------------------------------------------------------------------------------------
>>
>>
>> On Thu, Aug 1, 2019 at 4:58 PM Guillaume Lemaître <g.lemaitre58 at gmail.com>
>> wrote:
>>
>>> It looks like your data contains string. You need to make some
>>> preprocessing before to give it the linear model.
>>>
>>> On Thu, 1 Aug 2019 at 22:16, Malik Yousef <malik.yousef at gmail.com>
>>> wrote:
>>>
>>>> Hello
>>>> When in using the scoring to be 'f1' then i get an error.
>>>> Here is the code and the error
>>>>
>>>> X=data
>>>> y=target_column
>>>> classifier = LinearSVC()
>>>> rfecv = RFECV(estimator=classifier, step=0.1,
>>>> cv=StratifiedKFold(5),scoring='f1')
>>>> rfecv.fit(X, y)
>>>>
>>>> The error is :
>>>> ValueError: pos_label=1 is not a valid label: array([u'c.pre',
>>>> u'n.pre'], dtype='<U5')
>>>>
>>>> Please your help
>>>> (I'm new to using scikit-leanr)
>>>>
>>>> ---------------------------------------------------------------------------------------
>>>> *Prof. Malik Yousef , Associate Professor                           *
>>>> *Zefat Academic College , Department of Information System  *
>>>> Home Page:
>>>> https://malikyousef.com/
>>>> Google Scholar Profile :
>>>> https://scholar.google.com/citations?user=9UCZ_q4AAAAJ&hl=en&oi=ao
>>>>
>>>> ----------------------------------------------------------------------------------------------------
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>>>
>>>
>>> --
>>> Guillaume Lemaitre
>>> INRIA Saclay - Parietal team
>>> Center for Data Science Paris-Saclay
>>> https://glemaitre.github.io/
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>>> scikit-learn at python.org
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>
>
> --
> Guillaume Lemaitre
> INRIA Saclay - Parietal team
> Center for Data Science Paris-Saclay
> https://glemaitre.github.io/
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> scikit-learn at python.org
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