code: public final void crossValidate() throws IOException {
  
      final String paramFile = this.parsedArguments.getString("params");
      final TrainingParameters params = InputOutputUtils
          .loadTrainingParameters(paramFile);
      final POSCrossValidator crossValidator = new POSCrossValidator(params);
      crossValidator.crossValidate(params);
    }
docs: Main access to the cross validation.
  @throws IOException
  input output exception if problems with corpora