The version is 0.6-SNAPSHOT >From terminal both commands trainclassifier and testclassifier work. Actually my real purpose is to use the TrainNaiveBayesJob in order to obtain a StandardNaiveBayesClassifier that i can use with the ModelDissector class similiar to chapter 15 in Mahout In Action, maybe the procedure is completely wrong. Thank you
On 14 December 2011 01:24, Ted Dunning <[email protected]> wrote: > Which version of Mahout? > > And what happens when you train the classifier from the command line? > > On Tue, Dec 13, 2011 at 2:27 PM, Daniele Volpi <[email protected] > >wrote: > > > First of all i've converted the train files in the format: > > target[\t]terms > > through the BayesFileFormatter class. > > Then i've converted these files (one per category) in SequenceFile using > > the seqdirectory program. > > After that I ran this code: > > > > TrainNaiveBayesJob trainer = new TrainNaiveBayesJob(); > > trainer.setConf(new Configuration()); > > > > String[] params = {"-i" + inputPath, "-o" + outputPath, "-ow", "-el"}; > > trainer.run(params); > > > > Here's the error message: > > > > java.lang.ClassCastException: org.apache.hadoop.io.Text cannot be cast to > > org.apache.mahout.math.VectorWritable > > at > > > > > org.apache.mahout.classifier.naivebayes.training.IndexInstancesMapper.map(IndexInstancesMapper.java:1) > > at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144) > > at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764) > > at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370) > > at > org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:212) > > > > On 13 December 2011 19:52, Grant Ingersoll <[email protected]> wrote: > > > > > What steps have you done? > > > > > > On Dec 13, 2011, at 12:29 PM, Daniele Volpi wrote: > > > > > > > Hi everyone, > > > > I'm trying to implement the Naive Bayes classifier through the > > > > TrainNaiveBayesJob class. > > > > After convert the text files in the required sequencefile for the > "run" > > > > method through the seqdirectory program i get this error: > > > > > > > > java.lang.ClassCastException: org.apache.hadoop.io.Text cannot be > cast > > to > > > > org.apache.mahout.math.VectorWritable > > > > > > > > Do you have some hints on the right usage of this class? > > > > > > > > Thanks, > > > > Daniele Volpi > > > > > > -------------------------------------------- > > > Grant Ingersoll > > > http://www.lucidimagination.com > > > > > > > > > > > > > > >
