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From web service <wbs...@gmail.com>
Subject Re: running examples for mahout.
Date Sat, 25 Sep 2010 06:01:47 GMT
Ok. Got it running. But what is the output expected to be. I suppose I can
find some recommendations ? But the dataset is already of the users and
corresponding ratings ? A bit confused about it.

Exactly what does output mean or what does it look like ?


-Mac

On Fri, Sep 24, 2010 at 12:25 PM, Sean Owen <srowen@gmail.com> wrote:

> The GroupLensDataModel expects the input from the "1 million" data set
> which has a different format. Use that instead. Or to make this work,
> just modify the code this runs here to not use GroupLensDataModel, but
> instead a FileDataModel, which will parse this more normal input.
>
> I guess this bit of info was not brought over to this wiki. I'll have
> to update it.
>
> On Fri, Sep 24, 2010 at 6:15 PM, web service <wbsrvc@gmail.com> wrote:
> > The input file can be obtained at -
> > http://www.grouplens.org/system/files/ml-data.tar__0.gz
> >
> > A sample entry in u.data looks like this
> > [code]
> > 196 242 3 881250949
> > [/code]
> >
> > I just want to run example. That's it.
> >
> > -Mac
> >
> > On Fri, Sep 24, 2010 at 9:28 AM, Sean Owen <srowen@gmail.com> wrote:
> >
> >> Looks like the input file's format isn't right. It's expecting that
> >> funky "::"-delimited file. What is the input like?
> >>
> >> The error message sure could be better, I can fix that.
> >>
> >> On Fri, Sep 24, 2010 at 4:54 PM, web service <wbsrvc@gmail.com> wrote:
> >> > How do I run examples listed at
> >> > https://cwiki.apache.org/MAHOUT/recommendationexamples.html
> >> >
> >> > I downloaded the file for grouplens dataset and after running the
> >> command, I
> >> > get back an error -
> >> > [code]
> >> >
> >> > mvn -e exec:java
> >> >
> >>
> -Dexec.mainClass="org.apache.mahout.cf.taste.example.grouplens.GroupLensRecommenderEvaluatorRunner"
> >> > -Dexec.args="-i
> >> > ~/software/hadoop/mahout/mahout-0.3/examples/input/ml-data/u.data"
> >> >
> >> >
> >> >
> >> > .................
> >> > Caused by: java.lang.StringIndexOutOfBoundsException: String index out
> of
> >> > range: -1
> >> >    at java.lang.String.substring(String.java:1937)
> >> >    at
> >> >
> >>
> org.apache.mahout.cf.taste.example.grouplens.GroupLensDataModel.convertGLFile(GroupLensDataModel.java:61)
> >> >    at
> >> >
> >>
> org.apache.mahout.cf.taste.example.grouplens.GroupLensDataModel.<init>(GroupLensDataModel.java:48)
> >> >    at
> >> >
> >>
> org.apache.mahout.cf.taste.example.grouplens.GroupLensRecommenderEvaluatorRunner.main(GroupLensRecommenderEvaluatorRunner.java:49)
> >> >
> >> > [/code]
> >> >
> >> >
> >> > -Mac
> >> >
> >>
> >
>

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