Hi, Just committed a new version of TestForest. If you add "-mr" to the command line it should launch a Hadoop Job to classify the data. This is a basic implementation that can't compute the confusion matrix, so using "-a" has no effect. This implementation is also not tested very well (being a work in progress), so if you want to test it, select a random subset of your test data and classify them using the sequential implementation (without using -mr) then compare the predictions with those of the distributed implementation, the results won't be exactly the same (due the random behavior of the classifier when it encounter ties) but 90% of the predictions should be the same.
let me know what you think of it. I'm working on the confusion matrix, but it should take some time to finish --- En date de : Ven 26.3.10, Yang Sun <[email protected]> a écrit : > De: Yang Sun <[email protected]> > Objet: Question about mahout Describe > À: [email protected] > Date: Vendredi 26 mars 2010, 22h16 > I was testing mahout recently. It > runs great on small testing datasets. > However, when I try to expand the dataset to a big dataset > directory, I got > the following error message: > > [localhost]$ hjar > examples/target/mahout-examples-0.4-SNAPSHOT.job > org.apache.mahout.df.mapreduce.TestForest -i > /user/fulltestdata/* -ds rf/ > testdata.info -m rf-testmodel-5-100 -a -o > rf/fulltestprediction > > Exception in thread "main" java.io.IOException: Cannot open > filename > /user/fulltestdata/* > at > org.apache.hadoop.hdfs.DFSClient$DFSInputStream.openInfo(DFSClient.java:1474) > at > org.apache.hadoop.hdfs.DFSClient$DFSInputStream.<init>(DFSClient.java:1465) > at > org.apache.hadoop.hdfs.DFSClient.open(DFSClient.java:372) > at > org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:178) > at > org.apache.hadoop.fs.FileSystem.open(FileSystem.java:351) > at > org.apache.mahout.df.mapreduce.TestForest.testForest(TestForest.java:190) > at > org.apache.mahout.df.mapreduce.TestForest.run(TestForest.java:137) > at > org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65) > at > org.apache.mahout.df.mapreduce.TestForest.main(TestForest.java:228) > 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:156) > My question is: can I use mahout on directories instead of > single files? and > how? > > Thanks, >
