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Posted to user@mahout.apache.org by Stefano Bellasio <st...@gmail.com> on 2011/01/29 13:03:13 UTC

DistributedSVDrecommender from GSoC

Hi guys, i'm trying to use DistributedSVDRecommender found at https://issues.apache.org/jira/browse/MAHOUT-371

I'm using that in an ec2 cluster with a 1mln ratings txt file from Movielens, but after 2 jobs execution, i receive this error...can anyone explain what about is? Thanks !!!

Exception in thread "main" java.lang.IllegalArgumentException: Can not create a Path from a null string
	at org.apache.hadoop.fs.Path.checkPathArg(Path.java:78)
	at org.apache.hadoop.fs.Path.<init>(Path.java:90)
	at org.apache.mahout.math.hadoop.decomposer.DistributedLanczosSolver.run(DistributedLanczosSolver.java:85)
	at org.apache.mahout.math.hadoop.decomposer.DistributedLanczosSolver$DistributedLanczosSolverJob.run(DistributedLanczosSolver.java:252)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
	at org.apache.mahout.cf.taste.hadoop.svd.DistributedSVDItemRecommenderJob.run(DistributedSVDItemRecommenderJob.java:101)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
	at org.apache.mahout.cf.taste.hadoop.svd.DistributedSVDItemRecommenderJob.main(DistributedSVDItemRecommenderJob.java:134)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.hadoop.util.RunJar.main(RunJar.java:186)