opennlp.tools.util.featuregen.PreviousTwoMapFeatureGenerator Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. 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.util.featuregen;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* This {@link FeatureGeneratorAdapter} generates features indicating the outcome associated with two previously occuring words.
*/
public class PreviousTwoMapFeatureGenerator implements AdaptiveFeatureGenerator {
private Map previousMap = new HashMap();
/**
* Generates previous decision features for the token based on contents of the previous map.
*/
public void createFeatures(List features, String[] tokens, int index, String[] preds) {
if (index > 0) {
features.add("ppd=" + previousMap.get(tokens[index]) + "," + previousMap.get(tokens[index - 1]));
}
}
public void updateAdaptiveData(String[] tokens, String[] outcomes) {
for (int i = 0; i < tokens.length; i++) {
previousMap.put(tokens[i], outcomes[i]);
}
}
/**
* Clears the previous map.
*/
public void clearAdaptiveData() {
previousMap.clear();
}
}