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
>
>
>
>
