edu.stanford.nlp.trees
Class ChelbaHeadFinder

java.lang.Object
  |
  +--edu.stanford.nlp.trees.ChelbaHeadFinder

All Implemented Interfaces:

HeadFinder

public class ChelbaHeadFinder

extends Object

implements HeadFinder

Implements the HeadFinder found in Ciprian Chelba's 2000 thesis. These rules are suitable for the Penn Treebank. This code assumes that tree category labels are interned and does comparisons with equality (==). It won't work if the category labels are not interned. In particular, this also means that functional tags should have been stripped.

Constructor Summary

ChelbaHeadFinder()

Method Summary

Tree	determineHead(Tree t) Determine which daughter of the current parse tree is the head.
static void	main(String[] args) Go through trees and determine their heads and print them.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ChelbaHeadFinder

public ChelbaHeadFinder()

Method Detail

determineHead

public Tree determineHead(Tree t)

Determine which daughter of the current parse tree is the head. It assumes that the daughters alread have had their heads determined. It assumes that category Strings were interned. It assumes that labels are a CategoryWordTag

Specified by:

determineHead in interface HeadFinder

Parameters:

t - The parse tree to examine the daughters of

Returns:

The parse tree that is the head

main

public static void main(String[] args)

Go through trees and determine their heads and print them. Just for debuggin' Use: java ChelbaHeadFinder /wsj/07