Hi,
As Roland says, this is a Numpy question rather than a scikit-learn
question. If you want to ignore specific fields then it indeed amounts to
removing the corresponding columns in your X array before feeding it to
your estimator.
(Note however that Random Forests have the advantages of being robust with
respect to noise attributes. Training with or without shouldn't change the
result by much.)
Best,
Gilles
On 13 August 2013 12:24, Jason Williams <jwilliams4...@yahoo.co.uk> wrote:
> Would it have influence on the result if some attributes are removed? Just
> want to double check because I am not very familiar with machine learning.
> If no impact for the result after some fields are taken out of input
> training data, I will just remove those fields because that would be
> simpler.
>
> Thank for help
>
>
>
>
>
> ________________________________
> From: Roland Szabo <rol...@gmail.com>
> To: Jason Williams <jwilliams4...@yahoo.co.uk>;
> scikit-learn-general@lists.sourceforge.net
> Sent: Tuesday, 13 August 2013, 6:11
> Subject: Re: [Scikit-learn-general] Can Random Forest Classifer ignore
> specific fields?
>
>
>
> Isn't it simpler to just take out the attributes you want to ignore from
> the data?
>
> Assuming the numpy array a contains your data and you don't want the first
> column (attribute):
>
> a = a[:,1:]
>
>
>
>
> On Tue, Aug 13, 2013 at 1:03 PM, Jason Williams <jwilliams4...@yahoo.co.uk>
> wrote:
>
> I follow an example found on the internet (
> http://blog.yhathq.com/posts/random-forests-in-python.html) for using
> Random Forest Classifer. The result looks working. From the sample code, it
> looks like taking all attributes to train the model. But checking api (
> http://scikit-learn.org/stable/modules/generated/sklearn.ensemble.RandomForestClassifier.html
> )
> there is no description telling that what parameter can be used to ignore
> some particular fileds/ attributes. So I would like to check if any
> parameter can be used to ignore particular fields or attributes?
> >
> >Thanks
> >
>
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>
> --
>
> Roland
> http://rolisz.ro/
>
>
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