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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 >> > >> >
