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From web service <wbs...@gmail.com>
Subject Re: running examples for mahout.
Date Fri, 24 Sep 2010 17:15:23 GMT
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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