"NoSuchMethodError during using text input plugin"

cnj125

Hi All,

I am following this tutorial to do text classification by rapid and wvtools.
http://nemoz.org/joomla/content/view/65/53/lang,en/
I can build the model and word list successfully, and I try to run the Java problem to classify text by the model. I have changed all the path to my own setting. But it

import java.io.File;
import java.io.IOException;

import com.rapidminer.RapidMiner;
import com.rapidminer.example.Example;
import com.rapidminer.example.ExampleSet;
import com.rapidminer.operator.IOContainer;
import com.rapidminer.operator.Model;
import com.rapidminer.operator.Operator;
import com.rapidminer.operator.OperatorChain;
import com.rapidminer.operator.OperatorCreationException;
import com.rapidminer.operator.OperatorException;
import com.rapidminer.tools.OperatorService;

public class RapidMinerTextClassifier {

	private OperatorChain wvtoolOperator;
	private Operator modelApplier;
	private Model model;

	public RapidMinerTextClassifier(File modelFile, File wordListFile)
			throws IOException, OperatorCreationException, OperatorException {

		RapidMiner.init(false, false, false, true);

		// Create the text input operator and set the path to the word list you stored using Rapid Miner
		// As there is only a single text, we use the SingleTextInput operator
		wvtoolOperator = (OperatorChain) OperatorService
				.createOperator("SingleTextInput");
		wvtoolOperator.setParameter("input_word_list", wordListFile
				.getAbsolutePath());

		// Add additional processing steps.
		// Note the setup must be same as the one you used when creating the classification model
		wvtoolOperator.addOperator(OperatorService
				.createOperator("StringTokenizer"));
		wvtoolOperator.addOperator(OperatorService
				.createOperator("EnglishStopwordFilter"));
		wvtoolOperator.addOperator(OperatorService
				.createOperator("TokenLengthFilter"));
		wvtoolOperator.addOperator(OperatorService
				.createOperator("PorterStemmer"));

		// Create the model applier
		modelApplier = OperatorService.createOperator("ModelApplier");

		// Load the model into a field of the class
		Operator modelLoader = OperatorService.createOperator("ModelLoader");
		modelLoader.setParameter("model_file", modelFile.getAbsolutePath());
		IOContainer container = modelLoader.apply(new IOContainer());
		model = container.get(Model.class);

	}

	public String apply(String text) throws OperatorException {

		// Set the text
		wvtoolOperator.setParameter("text", text);

		// Call the text input operator
		IOContainer container = wvtoolOperator.apply(new IOContainer(model));

		// Call the model applier (the model was added already before calling the text input)
		container = modelApplier.apply(container);

		// Obtain the example set from the io container. It contains only a single example with our text in it.
		ExampleSet eset = container.get(ExampleSet.class);
		Example e = eset.iterator().next();

		// Compare the predicted label with the positive label
		return eset.getAttributes().getPredictedLabel().getMapping().mapIndex((int) e.getPredictedLabel());

	}

	public static void main(String args[]) throws Exception {
		System.setProperty("rapidminer.home", "C:/Program Files/Rapid-I/RapidMiner-4.2");

		// Create a text classifier  
		RapidMinerTextClassifier tr = new RapidMinerTextClassifier(
				new File(
						"C:/Documents and Settings/user/My Documents/rm_workspace/sample/data/training_model.mod"),
				new File(
						"C:/Documents and Settings/user/My Documents/rm_workspace/sample/data/training_words.list"));

		// Call the classifier with texts
		System.out.println("Test1:" + tr.apply("povrai xflick resolution gif"));
		System.out.println("Test2:" + tr.apply("workstation intel switch"));

	}

}

But it return an error like that

Exception in thread "main" java.lang.NoSuchMethodError: edu.udo.cs.wvtool.main.WVTool.createVector(Ledu/udo/cs/wvtool/main/WVTTokenSequence;Ledu/udo/cs/wvtool/generic/vectorcreation/WVTVectorCreator;Ledu/udo/cs/wvtool/wordlist/WVTWordList;)Ledu/udo/cs/wvtool/main/WVTWordVector; at com.rapidminer.operator.TextInput.apply(Unknown Source) at com.rapidminer.operator.Operator.apply(Operator.java:664) at com.RapidMiner.demo.RapidMinerTextClassifier.apply(RapidMinerTextClassifier.java:64) at com.RapidMiner.demo.RapidMinerTextClassifier.main(RapidMinerTextClassifier.java:89)

Anyone idea to solve this problem ? Thank you very much

IngoRM

Hi,

are you sure you used the same version of RapidMiner / the Text plugin for model creation and model application?

Cheers,
Ingo

cnj125

mierswa wrote:
Hi, are you sure you used the same version of RapidMiner / the Text plugin for model creation and model application? Cheers, Ingo

Hi,

I have found out the reason. I have included the wvtool jar file in my problem, and the version may be not correct.
I can run it after removing it in my classpath. Thank you very much.

Regards,
Ben