StanfordNLP：无法用 7-class-ner 识别日期

Question

我正在使用 stanfordNLP 从文本中获取日期实体。这是我尝试过的代码：-

import java.io.IOException;
import java.util.List;
import edu.stanford.nlp.ie.AbstractSequenceClassifier;
import edu.stanford.nlp.ie.crf.CRFClassifier;
import edu.stanford.nlp.ling.CoreAnnotations;
import edu.stanford.nlp.ling.CoreLabel;

public class StanfordNLP_POC
{

    public static void main(String[] args) throws IOException
    {
        // TODO Auto-generated method stub
        String classifierPath = "src//main//resources//classifiers//english.muc.7class.distsim.crf.ser.gz";

        String inputString = "Appointment Facility: ABC Medicine Clinic 05/07/2020 Progress Notes: Niel Armstrong, DO Current Medications Reason for Appointment";

        AbstractSequenceClassifier classifier = CRFClassifier.getClassifierNoExceptions(classifierPath);

        List<List<CoreLabel>> out = classifier.classify(inputString);

        System.out.println(out.toString());

        for (List<CoreLabel> sentence : out)
        {
            for (CoreLabel word : sentence)
            {

                if (word.getString(CoreAnnotations.AnswerAnnotation.class).equals("O"))
                    continue;
                System.out.println(word.word() + " = " + word.get(CoreAnnotations.AnswerAnnotation.class));
            }
        }

    }

}

我不明白为什么它没有提取日期，即使它在文本中非常清晰可识别。

Answer 1

您应该使用完整的管道。这是一个查找日期的示例。

package edu.stanford.nlp.examples;

import edu.stanford.nlp.pipeline.*;

import java.util.*;
import java.util.stream.*;

public class DateExtractionExample {

  public static void main(String[] args) {
    String text = "Appointment Facility: ABC Medicine Clinic 05/07/2020 Progress Notes: Niel Arrmstrong, DO Current " +
        "Medications Reason For Appointment";
    Properties props = new Properties();
    props.setProperty("annotators", "tokenize,ssplit,pos,lemma,ner");
    StanfordCoreNLP pipeline = new StanfordCoreNLP(props);
    CoreDocument doc = pipeline.processToCoreDocument(text);
    List<CoreEntityMention> dates = doc.entityMentions().stream().filter(em -> em.entityType().equals("DATE")).collect(
        Collectors.toList());
    System.err.println(dates);
  }

}