edu.ucla.sspace.wordsi.psd

Class PseudoWordDependencyContextExtractor

java.lang.Object

edu.ucla.sspace.wordsi.DependencyContextExtractor

edu.ucla.sspace.wordsi.psd.PseudoWordDependencyContextExtractor

All Implemented Interfaces:

ContextExtractor

public class PseudoWordDependencyContextExtractor
extends DependencyContextExtractor

A pseudo word based DependencyContextExtractor. Given a mapping from raw tokens to pseudo words, this extractor will automatically change the text for any dependency node that has a valid pseudo word mapping. The pseudo word will serve as the primary key for assignments and the original token will serve as the secondary key.

Author:

Keith Stevens

Field Summary

Fields inherited from class edu.ucla.sspace.wordsi.DependencyContextExtractor

extractor, generator, readHeader

Constructor Summary

Constructors

Constructor and Description
PseudoWordDependencyContextExtractor(DependencyExtractor extractor, DependencyContextGenerator generator, Map<String,String> pseudoWordMap) Creates a new PseudoWordDependencyContextExtractor.

Method Summary

Methods

Modifier and Type	Method and Description
protected boolean	acceptWord(DependencyTreeNode focusNode, String contextHeader, Wordsi wordsi) Returns true if focusWord is a known pseudo word.
void	processDocument(BufferedReader document, Wordsi wordsi) Processes the content of document and calls Wordsi.handleContextVector(java.lang.String, java.lang.String, edu.ucla.sspace.vector.SparseDoubleVector) for each context vector that can be extracted from document.

Methods inherited from class edu.ucla.sspace.wordsi.DependencyContextExtractor

getPrimaryKey, getSecondaryKey, getVectorLength, handleContextHeader

Methods inherited from class java.lang.Object

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

Constructor Detail

PseudoWordDependencyContextExtractor

public PseudoWordDependencyContextExtractor(DependencyExtractor extractor,
                                    DependencyContextGenerator generator,
                                    Map<String,String> pseudoWordMap)

Creates a new PseudoWordDependencyContextExtractor.

Parameters:

extractor - The DependencyExtractor that parses the document and returns a valid dependency tree

basisMapping - A mapping from dependency paths to feature indices

weighter - A weighting function for dependency paths

acceptor - An accepting function that validates dependency paths which may serve as features

pseudoWordMap - A mapping from raw tokens to pseudo words

Method Detail

processDocument

public void processDocument(BufferedReader document,
                   Wordsi wordsi)

Processes the content of document and calls Wordsi.handleContextVector(java.lang.String, java.lang.String, edu.ucla.sspace.vector.SparseDoubleVector) for each context vector that can be extracted from document.

Specified by:

processDocument in interface ContextExtractor

Overrides:

processDocument in class DependencyContextExtractor

acceptWord

protected boolean acceptWord(DependencyTreeNode focusNode,
                 String contextHeader,
                 Wordsi wordsi)

Returns true if focusWord is a known pseudo word.

Overrides:

acceptWord in class DependencyContextExtractor