Hi everyone,
Can someone please explain why i 'm getting this 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
