| /* |
| * 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.lang.jpn; |
| |
| import java.util.List; |
| |
| import opennlp.tools.util.featuregen.AdaptiveFeatureGenerator; |
| |
| /** |
| * Adds trigram features based on tokens and token classes. |
| * |
| */ |
| public class TrigramNameFeatureGenerator implements AdaptiveFeatureGenerator { |
| |
| public void createFeatures(List<String> features, String[] tokens, int index, |
| String[] previousOutcomes) { |
| String wc = FeatureGeneratorUtil.tokenFeature(tokens[index]); |
| // trigram features |
| if (index > 1) { |
| features.add("ppw,pw,w=" + tokens[index - 2] + "," + tokens[index - 1] + "," + tokens[index]); |
| String pwc = FeatureGeneratorUtil.tokenFeature(tokens[index - 1]); |
| String ppwc = FeatureGeneratorUtil.tokenFeature(tokens[index - 2]); |
| features.add("ppwc,pwc,wc=" + ppwc + "," + pwc + "," + wc); |
| } |
| if (index + 2 < tokens.length) { |
| features.add("w,nw,nnw=" + tokens[index] + "," + tokens[index + 1] + "," + tokens[index + 2]); |
| String nwc = FeatureGeneratorUtil.tokenFeature(tokens[index + 1]); |
| String nnwc = FeatureGeneratorUtil.tokenFeature(tokens[index + 2]); |
| features.add("wc,nwc,nnwc=" + wc + "," + nwc + "," + nnwc); |
| } |
| } |
| } |