CODEWITHSUNDEEP
nlpstanford-nlpphraseparse-tree
user1986167
user1986167

Reputation: 31

How to get phrase tags in Stanford CoreNLP?

If I want to get phrase tags corresponding each word, how to I get this?

For example :

In this sentence,

My dog also likes eating sausage.

I can get a parse tree in Stanford NLP such as

(ROOT (S (NP (PRP$ My) (NN dog)) (ADVP (RB also)) (VP (VBZ likes) (NP (JJ eating) (NN sausage))) (. .)))

In the above situtation, I want to get phrase tags corresponding each word like

(My - NP), (dog - NP), (also - ADVP), (likes - VP), ...

Is there any method for this simple extraction for phrase tags?

Please help me.

Upvotes: 3

Views: 3972

Answers (2)

berty
berty

Reputation: 21

I'm basically continuing the original question. Using Stanza, I would like to obtain a phrase tag per word in a text.

nlp = stanza.Pipeline(lang='en', processors='tokenize,pos,constituency')
doc = nlp('My dog also likes eating sausage.')
tree = doc.sentences[0].constituency

The parse tree obtained is:

(ROOT (S (NP (PRP$ My) (NN dog)) (ADVP (RB also)) (VP (VBZ likes) (S (VP (VBG eating) (NP (NN sausage))))) (. .)))

but would like phrase tags (exactly as in the original question):

(My - NP), (dog - NP), (also - ADVP), (likes - VP), ...

Has this been solved? Thanks!

Upvotes: 1

hunterhector
hunterhector

Reputation: 61

//I guess this is how you get your parse tree.
Tree tree = sentAnno.get(TreeAnnotation.class);

//The children of a Tree annotation is an array of trees.
Tree[] children = parent.children() 

//Check the label of any sub tree to see whether it is what you want (a phrase)
for (Tree child: children){
   if (child.value().equals("NP")){// set your rule of defining Phrase here
          List<Tree> leaves = child.getLeaves(); //leaves correspond to the tokens
          for (Tree leaf : leaves){ 
            List<Word> words = leaf.yieldWords();
            for (Word word: words)
                System.out.print(String.format("(%s - NP),",word.word()));
          }
   }
}

The code is not fully tested but I think it roughly do what you need. And what's more is I didn't write anything about recursively visit the subtrees but I believe you should be able to do that.

Upvotes: 2

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