NullPointerException - crossValidator

[Anonymous]

Hi everyone,

Can someone please explain why i 'm getting this very strange NPE when trying to use the TokenNameFinderCrossValidator?
TokenNameFinderEvaluator seems to be working just fine but because i've got very little training-data i'd like to do cross-validation as well…

The code is as follows:

public String cross-validate(String fname, int kFolds){

FileInputStream sampleDataIn = new FileInputStream(fname);
ObjectStream<NameSample> sampleStream = new NameSampleDataStream(
                                                                              new PlainTextByLineStream(
                                                                              sampleDataIn.getChannel(), "UTF-8"));
TokenNameFinderCrossValidator judge = new TokenNameFinderCrossValidator("en",
                                                                        null,
                                                                        new TrainingParameters(),
                                                                        null,
                                                                        null,
                                                                        null);
judge.evaluate(sampleStream, kFolds);    
FMeasure result = evaluator.getFMeasure();
return result.toString();

}

The exception is thrown right after the first 100 iterations for the first fold:

NullPointerException   opennlp.tools.namefind.TokenNameFinderModel.<init> (TokenNameFinderModel.java:90)

If i omit the "new NameSampleDataStream()" (as shown in the docs) i get a different error saying:

ClassCastException java.lang.String cannot be cast to opennlp.tools.namefind.NameSample  opennlp.tools.namefind.TokenNameFinderCrossValidator$NameToDocumentSampleStream.read (TokenNameFinderCrossValidator.java:67)

What am i missing?

Thanks in advance…

Jim

p.s: perhaps I should clarify that i 'm using the latest code from svn…

[Anonymous]

Ooops! The forum is closed?

Sorry my bad!!!