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From Lucas Fernandes Brunialti <lbrunia...@igcorp.com.br>
Subject Re: SVM Implementation for mahout?
Date Sun, 08 Dec 2013 02:22:23 GMT
Hello Fernando,

The naive bayes approach makes the assumption that your features are
independent, if your featurea have a high correlation, naive bayes won't be
a good choice.

I would advice you to try the neural networks (mlp), it can get a better
decision surface than logistic regression...

Best.

Lucas.
On Dec 7, 2013 6:53 PM, "Fernando Santos" <fernandoleandro1991@gmail.com>
wrote:

> Hello Suneel,
>
> I want to check if any better performance is reached with SVM.
>
> I've been using naive bayes, but my data is quite unbalanced and therefore
> I'm getting pretty bad results with it. I also tried the complementary
> naive bayes, but got the same bad results. I read about this difference
> between NaiveBayes performance of Weka and Mahout implementations and maybe
> that's the cause (
>
> http://mail-archives.apache.org/mod_mbox/mahout-user/201109.mbox/%3CCABdaxxiJTfV9nhQXxPYd72RRsv-H60Ps13H0PUNd2iNJX70BnA@mail.gmail.com%3E
> ).
>
> I also tried logistic regression and got around 77% accuracy. So maybe with
> SVM it could be better.
>
>
> 2013/12/7 Suneel Marthi <suneel_marthi@yahoo.com>
>
> > Any specific reasons u r looking for an SVM implementation only?
> > R u sure that those patches r still relevant given the codebase today?
> >
> >
> >
> >
> >
> > On Saturday, December 7, 2013 2:58 PM, Fernando Santos <
> > fernandoleandro1991@gmail.com> wrote:
> >
> > Thanks Manuel.
> >
> > It seems that these two (
> https://issues.apache.org/jira/browse/MAHOUT-334
> > and https://issues.apache.org/jira/browse/MAHOUT-232) patches might
> work,
> > although not in parallel.
> >
> > Does anyone has sucessfully used any of these two patches already and
> could
> > share some comments about it?
> >
> > Thanks
> >
> >
> > 2013/12/6 Manuel Blechschmidt <Manuel.Blechschmidt@gmx.de>
> >
> > > Hi Fernando,
> > > there are some patches and some discussions:
> > >
> > > SVM:
> > > https://issues.apache.org/jira/browse/MAHOUT-334
> > > https://issues.apache.org/jira/browse/MAHOUT-232
> > > https://issues.apache.org/jira/browse/MAHOUT-14
> > > https://issues.apache.org/jira/browse/MAHOUT-227
> > >
> > > /Manuel
> > >
> > > On 06.12.2013, at 19:14, Fernando Santos wrote:
> > >
> > > > Hello,
> > > >
> > > > Is there any tested SVM implementation for Mahout?
> > > >
> > > > Mahout in action says there is a sequential implementation, but
> > > > "Experimental still". I couldn't find this implementation.
> > > >
> > > > Thanks
> > > >
> > > > --
> > > > Fernando Santos
> > > > +55 61 8129 8505
> > >
> > > --
> > > Manuel Blechschmidt
> > > M.Sc. IT Systems Engineering
> > > Dortustr. 57
> > > 14467 Potsdam
> > > Mobil: 0173/6322621
> > > Twitter: http://twitter.com/Manuel_B
> >
> > >
> > >
> >
> >
> > --
> > Fernando Santos
> > +55 61 8129 8505
> >
>
>
>
> --
> Fernando Santos
> +55 61 8129 8505
>

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