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 > > >
