How to print the parse tree of Stanford JavaNLP

问题

I am trying to get all the noun phrases using the edu.stanford.nlp.* package. I got all the subtrees of label value "NP", but I am not able to get the normal original String format (not Penn Tree format).

E.g. for the subtree.toString() gives (NP (ND all)(NSS times))) but I want the string "all times". Can anyone please help me. Thanks in advance.

回答1:

I believe what you want is something like:

final StringBuilder sb = new StringBuilder();

for ( final Tree t : tree.getLeaves() ) {
     sb.append(t.toString()).append(" ");
}

While I'm not 100% sure, I seem to recall this being the solution used for some software I worked on a few years back.

回答2:

This can be accomplished using the yield() method for the subtree, instead of creating a separate StringBuilder objext.

if (subtree.label().value().equals("NP")) {
    out.println(subtree);       //print subtree
    out.println(Sentence.listToString(subtree.yield()));    //print phrase  
    break;
}

来源：https://stackoverflow.com/questions/11148890/how-to-print-the-parse-tree-of-stanford-javanlp