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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreemnets. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package opennlp.tools.doccat;
import java.io.IOException;
import java.io.ObjectStreamException;
import java.util.HashMap;
import java.util.Map;
import opennlp.maxent.GIS;
import opennlp.model.AbstractModel;
import opennlp.model.MaxentModel;
import opennlp.model.TwoPassDataIndexer;
import opennlp.tools.tokenize.SimpleTokenizer;
import opennlp.tools.tokenize.Tokenizer;
import opennlp.tools.util.ObjectStream;
import opennlp.tools.util.model.ModelUtil;
/**
* Maxent implementation of {@link DocumentCategorizer}.
*/
public class DocumentCategorizerME implements DocumentCategorizer {
/**
* Shared default thread safe feature generator.
*/
private static FeatureGenerator defaultFeatureGenerator = new BagOfWordsFeatureGenerator();
private MaxentModel model;
private DocumentCategorizerContextGenerator mContextGenerator;
/**
* Initializes a the current instance with a doccat model and custom feature generation.
* The feature generation must be identical to the configuration at training time.
*
* @param model
* @param featureGenerators
*/
public DocumentCategorizerME(DoccatModel model, FeatureGenerator... featureGenerators) {
this.model = model.getChunkerModel();
this.mContextGenerator = new DocumentCategorizerContextGenerator(featureGenerators);
}
/**
* Initializes the current instance with a doccat model. Default feature generation is used.
*
* @param model
*/
public DocumentCategorizerME(DoccatModel model) {
this(model, defaultFeatureGenerator);
}
/**
* Initializes the current instance with the given {@link MaxentModel}.
*
* @param model
*
* @deprecated Use {@link DocumentCategorizerME#DocumentCategorizerME(DoccatModel)} instead.
*/
@Deprecated
public DocumentCategorizerME(MaxentModel model) {
this(model, new FeatureGenerator[]{new BagOfWordsFeatureGenerator()});
}
/**
* Initializes the current instance with a the given {@link MaxentModel}
* and {@link FeatureGenerator}s.
*
* @param model
* @param featureGenerators
*
* @deprecated Use {@link DocumentCategorizerME#DocumentCategorizerME(DoccatModel, FeatureGenerator...)} instead.
*/
@Deprecated
public DocumentCategorizerME(MaxentModel model,
FeatureGenerator... featureGenerators) {
this.model = model;
mContextGenerator =
new DocumentCategorizerContextGenerator(featureGenerators);
}
/**
* Categorizes the given text.
*
* @param text
*/
public double[] categorize(String text[]) {
return model.eval(mContextGenerator.getContext(text));
}
public double[] categorize(String documentText) {
Tokenizer tokenizer = SimpleTokenizer.INSTANCE;
return categorize(tokenizer.tokenize(documentText));
}
public String getBestCategory(double[] outcome) {
return model.getBestOutcome(outcome);
}
public int getIndex(String category) {
return model.getIndex(category);
}
public String getCategory(int index) {
return model.getOutcome(index);
}
public int getNumberOfCategories() {
return model.getNumOutcomes();
}
public String getAllResults(double results[]) {
return model.getAllOutcomes(results);
}
/**
* Trains a new model for the {@link DocumentCategorizerME}.
*
* @param eventStream
*
* @return the new model
*/
@Deprecated
public static AbstractModel train(DocumentCategorizerEventStream eventStream) throws IOException {
return GIS.trainModel(100, new TwoPassDataIndexer(eventStream, 5));
}
/**
* Trains a document categorizer model with custom feature generation.
*
* @param languageCode
* @param samples
* @param cutoff
* @param iterations
* @param featureGenerators
* @return
* @throws IOException
*/
public static DoccatModel train(String languageCode, ObjectStream samples, int cutoff, int iterations, FeatureGenerator... featureGenerators)
throws IOException {
Map manifestInfoEntries = new HashMap();
ModelUtil.addCutoffAndIterations(manifestInfoEntries, cutoff, iterations);
AbstractModel model = GIS.trainModel(iterations, new TwoPassDataIndexer(
new DocumentCategorizerEventStream(samples, featureGenerators), cutoff));
return new DoccatModel(languageCode, model, manifestInfoEntries);
}
/**
* Trains a doccat model with default feature generation.
*
* @param languageCode
* @param samples
* @return
* @throws IOException
* @throws ObjectStreamException
*/
public static DoccatModel train(String languageCode, ObjectStream samples, int cutoff, int iterations) throws IOException {
return train(languageCode, samples, cutoff, iterations, defaultFeatureGenerator);
}
/**
* Trains a doccat model with default feature generation.
*
* @param languageCode
* @param samples
* @return
* @throws IOException
* @throws ObjectStreamException
*/
public static DoccatModel train(String languageCode, ObjectStream samples) throws IOException {
return train(languageCode, samples, 5, 100, defaultFeatureGenerator);
}
}
