edu.illinois.cs.cogcomp.edison.features.factory

Class DependencyPath

java.lang.Object

edu.illinois.cs.cogcomp.edison.features.factory.DependencyPath

All Implemented Interfaces:

FeatureExtractor

public class DependencyPath
extends Object
implements FeatureExtractor

Given two tokens, this feature extractor extracts the following features:

• The path (without tokens) in the dependency tree from the first token of the first constituent to the first token of the second one.
• The path, where tokens are represented by their POS tag
• The length of the path

The dependency tree is read from the view name specified in the constructor. If possible, use the static objects for the Easy-first dependency tree (which uses ViewNames.DEPENDENCY) or the Stanford dependency tree (which uses ViewNames.DEPENDENCY_STANFORD)

Important note: To be able to specify the two constituents as input, the feature extractor assumes the following convention: The constituent that is specified as a parameter to the getFeatures function has an incoming relation from the first constituent. Furthermore, this incoming relation should be the only such relation.

This convention does not limit the expressivity in any way because the two constituents could be created on the spot before calling the feature extractor.

Author:

Vivek Srikumar

Field Summary

Fields

Modifier and Type	Field and Description
static DependencyPath	EASY_FIRST
static DependencyPath	STANFORD

Constructor Summary

Constructors

Constructor and Description
DependencyPath(String dependencyViewName)

Method Summary

Modifier and Type	Method and Description
Set<Feature>	getFeatures(Constituent c)
String	getName()

Methods inherited from class java.lang.Object

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

Field Detail

EASY_FIRST

public static DependencyPath EASY_FIRST

STANFORD

public static DependencyPath STANFORD

Constructor Detail

DependencyPath

public DependencyPath(String dependencyViewName)

Method Detail

getFeatures

public Set<Feature> getFeatures(Constituent c)
                         throws EdisonException

Specified by:

getFeatures in interface FeatureExtractor

Throws:

EdisonException

getName

public String getName()

Specified by:

getName in interface FeatureExtractor