斯坦福解析器的非法参数异常

Question

我尝试使用斯坦福解析器解析一个句子，但出现异常。下面指定了输入文件、代码和异常。

我认为问题是因为输入文件中的 Penn 树不处理标点符号。如何生成也能处理标点符号的潘恩树？

输入文件

(ROOT
  (S
    (NP (DT A) (NN doctor) (NN investigation) (NN system) (NN (DIS)))
    (VP (VBZ is)
      (NP
        (NP (DT a) (NN part))
        (PP (IN of)
          (NP (DT a) (NN hospital) (NN information) (NN system) (NN (HIS).)))))))

代码

            String str="-collapsed -treeFile temp.txt";
            String ar[]=str.split(" ");
            edu.stanford.nlp.trees.EnglishGrammaticalStructure.main(ar);

             try {
                FileOutputStream fw = new FileOutputStream("k.txt");
                PrintStream out = new PrintStream(fw);
                System.setOut(out);



            } catch (Exception e) {
                System.out.print(e);
            }

引发异常：

Head is null: NN-37
Exception in thread "main" java.lang.IllegalArgumentException: governor or dependent cannot be null
        at edu.stanford.nlp.trees.UnnamedDependency.<init>(UnnamedDependency.java:105)
        at edu.stanford.nlp.trees.TreeGraphNode.dependencies(TreeGraphNode.java:519)
        at edu.stanford.nlp.trees.Tree.dependencies(Tree.java:1090)
        at edu.stanford.nlp.trees.GrammaticalStructure.<init>(GrammaticalStructure.java:71)
        at edu.stanford.nlp.trees.EnglishGrammaticalStructure.<init>(EnglishGrammaticalStructure.java:115)
        at edu.stanford.nlp.trees.EnglishGrammaticalStructure.<init>(EnglishGrammaticalStructure.java:89)
        at edu.stanford.nlp.trees.EnglishGrammaticalStructure.<init>(EnglishGrammaticalStructure.java:61)
        at edu.stanford.nlp.trees.EnglishGrammaticalStructure.<init>(EnglishGrammaticalStructure.java:53)

Answer 1

无用的错误消息，但这是因为输入树的格式不正确：最后有一个杂散期。该树应该是格式良好的 s 表达式。