java - 斯坦福自然语言处理 : incompatible types: Object cannot be converted to CoreMap

Question

我正在尝试使用StanfordNLP使用this tutorial进行命名实体识别。我收到错误

不兼容的类型:对象无法转换为 CoreMap
我尝试将其类型转换为 Object 但无法使其正常工作。

部分代码抛出错误

  // these are all the sentences in this document
  // a CoreMap is essentially a Map that uses class objects as keys and has values with
  // custom types
  List sentences = document.get(SentencesAnnotation.class);
  StringBuilder sb = new StringBuilder();
for (CoreMap sentence : sentences) {
    // traversing the words in the current sentence, "O" is a sensible default to initialise
    // tokens to since we're not interested in unclassified / unknown things..
    String prevNeToken = "O";
    String currNeToken = "O";
    boolean newToken = true;
    for (CoreLabel token : sentence.get(TokensAnnotation.class)) {
      currNeToken = token.get(NamedEntityTagAnnotation.class);
      String word = token.get(TextAnnotation.class);
      // Strip out "O"s completely, makes code below easier to understand
      if (currNeToken.equals("O")) {
        // LOG.debug("Skipping '{}' classified as {}", word, currNeToken);
        if (!prevNeToken.equals("O") && (sb.length() > 0)) {
          handleEntity(prevNeToken, sb, tokens);
          newToken = true;
        }
        continue;
      }

      if (newToken) {
        prevNeToken = currNeToken;
        newToken = false;
        sb.append(word);
        continue;
      }

      if (currNeToken.equals(prevNeToken)) {
        sb.append(" " + word);
      } else {
        // We're done with the current entity - print it out and reset
        // TODO save this token into an appropriate ADT to return for useful processing..
        handleEntity(prevNeToken, sb, tokens);
        newToken = true;
      }
      prevNeToken = currNeToken;
    }
  }

我是 NLP 菜鸟。提前致谢。

Answer 1

我成功解决了这个问题。将第三行更改为此

List<CoreMap> sentences = document.get(SentencesAnnotation.class);