So for example i need to follow the same steps of Wikipedia example in Mahout in Action? then package it and use with this? Please i need some info just about the correct steps :) Thanks
Il giorno 20/nov/2010, alle ore 12.28, Sean Owen ha scritto: > Yes, you can't use this recommender directly, since it has no no-arg > constructor. It by itself is not a complete recommender system -- it doesn't > have a DataModel. You need to write your own wrapper implementation of > Recommender which constructs a complete delegate inside. See the examples in > the javadoc or book. > > On Sat, Nov 20, 2010 at 11:23 AM, Stefano Bellasio < > [email protected]> wrote: > >> Ok, im searching for that, but first of all, before that error i see >> >> java.lang.IllegalStateException: java.lang.NoSuchMethodException: >> org.apache.mahout.cf.taste.impl.recommender.GenericItemBasedRecommender.<init>(org.apache.mahout.cf.taste.model.DataModel) >> at >> org.apache.mahout.cf.taste.hadoop.pseudo.RecommenderReducer.setup(RecommenderReducer.java:81) >> at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:174) >> at >> org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:566) >> at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:408) >> at >> org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:216) >> Caused by: java.lang.NoSuchMethodException: >> org.apache.mahout.cf.taste.impl.recommender.GenericItemBasedRecommender.<init>(org.apache.mahout.cf.taste.model.DataModel) >> at java.lang.Class.getConstructor0(Class.java:2706) >> at java.lang.Class.getConstructor(Class.java:1657) >> at >> org.apache.mahout.cf.taste.hadoop.pseudo.RecommenderReducer.setup(RecommenderReducer.java:78) >> ... 4 more >> 10/11/20 12:21:50 INFO mapred.JobClient: Job complete: job_local_0001 >> 10/11/20 12:21:50 INFO mapred.JobClient: Counters: 14 >> 10/11/20 12:21:50 INFO mapred.JobClient: FileSystemCounters >> 10/11/20 12:21:50 INFO mapred.JobClient: FILE_BYTES_READ=17546530 >> 10/11/20 12:21:50 INFO mapred.JobClient: HDFS_BYTES_READ=34695906 >> 10/11/20 12:21:50 INFO mapred.JobClient: FILE_BYTES_WRITTEN=11751492 >> 10/11/20 12:21:50 INFO mapred.JobClient: HDFS_BYTES_WRITTEN=17542312 >> 10/11/20 12:21:50 INFO mapred.JobClient: Map-Reduce Framework >> 10/11/20 12:21:50 INFO mapred.JobClient: Reduce input groups=0 >> 10/11/20 12:21:50 INFO mapred.JobClient: Combine output records=0 >> 10/11/20 12:21:50 INFO mapred.JobClient: Map input records=1000209 >> 10/11/20 12:21:50 INFO mapred.JobClient: Reduce shuffle bytes=0 >> 10/11/20 12:21:50 INFO mapred.JobClient: Reduce output records=0 >> 10/11/20 12:21:50 INFO mapred.JobClient: Spilled Records=2000418 >> 10/11/20 12:21:50 INFO mapred.JobClient: Map output bytes=1990807 >> 10/11/20 12:21:50 INFO mapred.JobClient: Combine input records=0 >> 10/11/20 12:21:50 INFO mapred.JobClient: Map output records=1000209 >> 10/11/20 12:21:50 INFO mapred.JobClient: Reduce input records=0 >> >> >> So is a problem about the class i think, well my command line is: >> >> ../hadoop/bin/hadoop jar core/target/mahout-core-0.5-SNAPSHOT.job.jar >> org.apache.mahout.cf.taste.hadoop.pseudo.RecommenderJob -i input/ratings.txt >> -o data/ratings4 --recommenderClassName >> org.apache.mahout.cf.taste.impl.recommender.GenericItemBasedRecommender >> >> Thanks again >> >> Il giorno 20/nov/2010, alle ore 12.07, Sean Owen ha scritto: >> >>> Sorry but that's something to do with Hadoop, not Mahout. It seems like >> an >>> error in your HDFS cluster. >>> >>> On Sat, Nov 20, 2010 at 10:41 AM, Stefano Bellasio < >>> [email protected]> wrote: >>> >>>> Ok Sean, thank you, works very well :) Now when i run hadoop with that >>>> before finish it say this: >>>> >>>> >> >>
