1. You can check the example java code in trunk : BuildForest.java and TestForest.java.
2. I think there is still no enough parameters options to use, at least not enough as R's 2010/3/12 Yang Sun <[email protected]> > Thanks for the reply. The trunk version runs without any problem. I still > have a couple questions about the method. > > 1. how can I output the model and how can I use the trained model to > predict > classes of new data? I saw the options of the class: > > Options > --data (-d) path Data path > --dataset (-ds) dataset Dataset path > --iterations (-i) numIterations Number of times to repeat the test > --nbtrees (-t) nbtrees Number of trees to grow, each iteration > --help (-h) Print out help > > It seems no option for specifying output directory on Hadoop. > > 2. There is also no option to specify number of random features for each > tree. How can I adjust that parameter? > > Thanks > > On Thu, Mar 11, 2010 at 10:29 AM, Ted Dunning <[email protected]> > wrote: > > > Try using the trunk version. We are about to release 0.3 and it has > > significant improvements. > > > > On Thu, Mar 11, 2010 at 9:40 AM, Yang Sun <[email protected]> > wrote: > > > > > Hi, > > > > > > It's the first time I try to use mahout. But the Breiman example gave > me > > > the > > > following exception: > > > > > > [localhost]$ hadoop jar examples/target/mahout-examples-0.2.job > > > org.apache.mahout.df.BreimanExample -d test_data/glass.data -ds > > test_data/ > > > glass.info -i 10 -t 100 > > > 10/03/11 09:26:07 INFO df.BreimanExample: Iteration 0 > > > 10/03/11 09:26:07 INFO df.BreimanExample: Growing a forest with m=4 > > > 10/03/11 09:26:07 INFO ref.SequentialBuilder: Building 10% > > > 10/03/11 09:26:07 INFO ref.SequentialBuilder: Building 20% > > > 10/03/11 09:26:07 INFO ref.SequentialBuilder: Building 30% > > > 10/03/11 09:26:07 INFO ref.SequentialBuilder: Building 40% > > > 10/03/11 09:26:07 INFO ref.SequentialBuilder: Building 50% > > > 10/03/11 09:26:07 INFO ref.SequentialBuilder: Building 60% > > > 10/03/11 09:26:07 INFO ref.SequentialBuilder: Building 70% > > > 10/03/11 09:26:07 INFO ref.SequentialBuilder: Building 80% > > > 10/03/11 09:26:07 INFO ref.SequentialBuilder: Building 90% > > > 10/03/11 09:26:07 INFO ref.SequentialBuilder: Building 100% > > > Exception in thread "main" java.lang.IllegalArgumentException: > > > labels.length > > > != predictions.length > > > at > > > org.apache.mahout.df.ErrorEstimate.errorRate(ErrorEstimate.java:29) > > > at > > > > org.apache.mahout.df.BreimanExample.runIteration(BreimanExample.java:108) > > > at > > org.apache.mahout.df.BreimanExample.run(BreimanExample.java:214) > > > at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65) > > > at > > org.apache.mahout.df.BreimanExample.main(BreimanExample.java:143) > > > 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) > > > > > > Can any one help me get through it? > > > > > > Thanks, > > > Yang > > > > > >
