Yes, there is still a lot of work to do =P As Ted said, Decision Forests classifier should ultimately have a similar interface to all Mahout classifiers.
> 1. how can I output the model and how can I use the trained model to > predict I should commit a patch really soon (this Saturday ?) that will allow you to save the trained model and use it to claffiy new data > 2. There is also no option to specify number of random > features for each tree. How can I adjust that parameter? the -sl parameter allows you to specify the number of random features the trainer will randomly select for each tree node. Is this what you are looking for ? > I think there is still no enough parameters options to use, at least not > enough as R's I'll love to hear any suggestion/addition you want me to make. I already have a lot of features I want to add, but I could use your (the users) feedback to know which feature I should start working on first. =D --- En date de : Ven 12.3.10, Cui tony <[email protected]> a écrit : > De: Cui tony <[email protected]> > Objet: Re: New to mahout > À: [email protected] > Date: Vendredi 12 mars 2010, 2h43 > 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 > > > > > > > > > >
