java - 如何从文本中获取NN和NNS？

我想从下面的脚本中给出的示例文本中获取NN或NNS。为此，当我使用下面的代码时，输​​出为：

types
synchronization
phase
synchronization
-RSB-
synchronization
-LSB-
-RSB-
projection
synchronization

为什么我会得到[-RSB-]或[-LSB-]？我是否应该使用其他模式同时获取NN或NNS？

                atic = "So far, many different types of synchronization have been investigated, such as complete synchronization [8], generalized synchronization [9], phase synchronization [10], lag synchronization [11], projection synchronization [12, 13], and so forth.";

Reader reader = new StringReader(atic);
DocumentPreprocessor dp = new DocumentPreprocessor(reader);
docs_terms_unq.put(rs.getString("u"), new ArrayList<String>());
docs_terms.put(rs.getString("u"), new ArrayList<String>());

for (List<HasWord> sentence : dp) {

List<TaggedWord> tagged = tagger.tagSentence(sentence);
GrammaticalStructure gs = parser.predict(tagged);


Tree x = parserr.parse(sentence);
System.out.println(x);
TregexPattern NPpattern = TregexPattern.compile("@NN|NNS");
TregexMatcher matcher = NPpattern.matcher(x);


while (matcher.findNextMatchingNode()) {

Tree match = matcher.getMatch();
ArrayList hh = match.yield();
Boolean b = false;

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

最佳答案

我不知道为什么会这样。但是，如果您使用语音标记器，您将获得更准确的POS标记。我建议直接看一下注解。这是一些示例代码。

import edu.stanford.nlp.ling.CoreAnnotations;
import edu.stanford.nlp.ling.CoreLabel;
import edu.stanford.nlp.pipeline.Annotation;
import edu.stanford.nlp.pipeline.StanfordCoreNLP;
import edu.stanford.nlp.util.CoreMap;

import java.util.Properties;

public class NNExample {

    public static void main(String[] args) {
        Properties props = new Properties();
        props.setProperty("annotators", "tokenize,ssplit,pos");
        StanfordCoreNLP pipeline = new StanfordCoreNLP(props);
        String text = "So far, many different types of synchronization have been investigated, such as complete " +
                "synchronization [8], generalized synchronization [9], phase synchronization [10], " +
                "lag synchronization [11], projection synchronization [12, 13], and so forth.";
        Annotation annotation = new Annotation(text);
        pipeline.annotate(annotation);
        for (CoreMap sentence : annotation.get(CoreAnnotations.SentencesAnnotation.class)) {
            for (CoreLabel token : sentence.get(CoreAnnotations.TokensAnnotation.class)) {
                String partOfSpeechTag = token.get(CoreAnnotations.PartOfSpeechAnnotation.class);
                if (partOfSpeechTag.equals("NN") || partOfSpeechTag.equals("NNS")) {
                    System.out.println(token.word());
                }
            }
        }
    }
}

和我得到的输出。

types
synchronization
synchronization
synchronization
phase
synchronization
lag
synchronization
projection
synchronization