edu.ucla.sspace.wordsi

Class PreComputedContextExtractor

java.lang.Object

edu.ucla.sspace.wordsi.PreComputedContextExtractor

All Implemented Interfaces:

ContextExtractor

public class PreComputedContextExtractor
extends Object
implements ContextExtractor

A ContextExtractor that assumes that the corpus has already been pre-processed and each document is a single line with the following format:

header score,feature(|score, feature)*

where header is some id that identifies the word being represented by this context, score is a double, and feature is some string. With this style of corpus, PreComputedContextExtractor will obtain a dimension for each feature and transform the line into a SparseDoubleVector, passing it to Wordsi for futher processing.

Author:

Keith Stevens

Constructor Summary

Constructors

Constructor and Description
PreComputedContextExtractor() Constructs a new PreComputedContextExtractor using a StringBasisMapping.
PreComputedContextExtractor(BasisMapping<String,String> basis) Constructs a new PreComputedContextExtractor using the given BasisMapping.

Method Summary

Methods

Modifier and Type	Method and Description
int	getVectorLength() Returns the maximum number of dimensions used to represent any given context.
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 java.lang.Object

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

Constructor Detail

PreComputedContextExtractor

public PreComputedContextExtractor()

Constructs a new PreComputedContextExtractor using a StringBasisMapping.

PreComputedContextExtractor

public PreComputedContextExtractor(BasisMapping<String,String> basis)

Constructs a new PreComputedContextExtractor using the given BasisMapping.

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

getVectorLength

public int getVectorLength()

Returns the maximum number of dimensions used to represent any given context.

Specified by:

getVectorLength in interface ContextExtractor