Question

我是自然语言处理（NLP）的新手，我想做词性标注（POS），然后在文本中找到特定的结构。我可以使用Stanford-NLP管理POS标记，但我不知道如何提取这个结构：

NN/NNS + IN + DT + NN/NNS/NNP/NNPS

public static void main(String args[]) throws Exception{
    //input File
    String contentFilePath = "";
    //outputFile
    String triplesFilePath = contentFilePath.substring(0, contentFilePath.length()-4)+"_postagg.txt";

    //document to POS tagging
    String content = getFileContent(contentFilePath);

    Properties props = new Properties();

    props.setProperty("annotators","tokenize, ssplit, pos");
    StanfordCoreNLP pipeline = new StanfordCoreNLP(props);
    // Annotate the document.
    Annotation doc = new Annotation(content);
    pipeline.annotate(doc);


    // Annotate the document.
    List<CoreMap> sentences = doc.get(CoreAnnotations.SentencesAnnotation.class);
    for (CoreMap sentence : sentences) {
        for (CoreLabel token: sentence.get(CoreAnnotations.TokensAnnotation.class)) {
            String word = token.get(CoreAnnotations.TextAnnotation.class);
            // this is the POS tag of the token
            String pos = token.get(CoreAnnotations.PartOfSpeechAnnotation.class);
            System.out.println(word + "/" + pos);
        } }}}

Answer 1

您可以简单地迭代您的句子并检查POS标签。如果它们符合您的要求，您可以提取此结构。代码可能如下所示：

for (CoreMap sentence : doc.get(CoreAnnotations.SentencesAnnotation.class)) { 
    List<CoreLabel> tokens = sentence.get(TokensAnnotation.class);
    for(int i = 0; i < tokens.size() - 3; i++) {
        String pos = tokens.get(i).get(PartOfSpeechAnnotation.class);
        if(pos.equals("NN") || pos.equals("NNS")) {
            pos = tokens.get(i + 1).getString(PartOfSpeechAnnotation.class);
            if(pos.equals("IN")) {
                pos = tokens.get(i + 2).getString(PartOfSpeechAnnotation.class);
                if(pos.equals("DT")) {
                    pos = tokens.get(i + 3).getString(PartOfSpeechAnnotation.class);
                    if(pos.contains("NN")) {
                        //We have a match starting at index i and ending at index i + 3
                        String word1 = tokens.get(i).getString(TextAnnotation.class);
                        String word2 = tokens.get(i + 1).getString(TextAnnotation.class);
                        String word3 = tokens.get(i + 2).getString(TextAnnotation.class);
                        String word4 = tokens.get(i + 3).getString(TextAnnotation.class);
                        System.out.println(word1 + " " + word2 + " " + word3 + " " + word4);
                    }
                }
            }
        }
    }   
}

在JAVA中使用Stanford nlp提取基于POS标记句子的语言结构

1 个答案: