opennlp.tools.sentdetect.SentenceDetectorEvaluator 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.sentdetect;
import opennlp.tools.util.Span;
import opennlp.tools.util.eval.Evaluator;
import opennlp.tools.util.eval.FMeasure;
/**
* The {@link SentenceDetectorEvaluator} measures the performance of
* the given {@link SentenceDetector} with the provided reference
* {@link SentenceSample}s.
*
* @see Evaluator
* @see SentenceDetector
* @see SentenceSample
*/
public class SentenceDetectorEvaluator extends Evaluator {
private FMeasure fmeasure = new FMeasure();
/**
* The {@link SentenceDetector} used to predict sentences.
*/
private SentenceDetector sentenceDetector;
/**
* Initializes the current instance.
*
* @param sentenceDetector
* @param listeners evaluation sample listeners
*/
public SentenceDetectorEvaluator(SentenceDetector sentenceDetector,
SentenceDetectorEvaluationMonitor... listeners) {
super(listeners);
this.sentenceDetector = sentenceDetector;
}
private Span[] trimSpans(String document, Span spans[]) {
Span trimedSpans[] = new Span[spans.length];
for (int i = 0; i < spans.length; i++) {
trimedSpans[i] = spans[i].trim(document);
}
return trimedSpans;
}
@Override
protected SentenceSample processSample(SentenceSample sample) {
Span predictions[] =
trimSpans(sample.getDocument(), sentenceDetector.sentPosDetect(sample.getDocument()));
Span[] references = trimSpans(sample.getDocument(), sample.getSentences());
fmeasure.updateScores(references, predictions);
return new SentenceSample(sample.getDocument(), predictions);
}
public FMeasure getFMeasure() {
return fmeasure;
}
}