StanfordNLP: Unable to identify Date with 7-class-ner

[tarunshah]

I'm using stanfordNLP to get date entities from text. Here's the code that i tried:-

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));
            }
        }

    }

}

I didn't get why it's not extracting Date even though it's very clearly identifiable in the text.

Also when trying with pipeline it extracts date but takes a bit longer to do so.

[AngledLuffa]

The statistical model doesn't have any experience recognizing that particular date format.

If you run CoreNLP with only the models you can see that it doesn't recognize it there, either:

java edu.stanford.nlp.pipeline.StanfordCoreNLP -ner.statisticalOnly

CoreNLP uses some hard coded expressions which recognize dates in that format.