it.uniroma2.sag.kelp.data.examplegenerator

Class SequenceExampleGeneratorKernel

java.lang.Object

it.uniroma2.sag.kelp.data.examplegenerator.SequenceExampleGeneratorKernel

All Implemented Interfaces:

SequenceExampleGenerator

public class SequenceExampleGeneratorKernel
extends Object
implements SequenceExampleGenerator

A SequenceExampleGeneratorKernelBasedAlg allows to implicitly enrich a targeted Example (reflecting an item in a SequenceExample) with information derived from the s assigned to the previous n examples.
Given a representation used to represent an example, this SequenceExampleGenerator generates a new example containing only feature reflecting the classes assigned to the previous examples in the sequence.
This class should be used when the kernel based learning algorithm is used. While a kernel function operates on the original representation, an additional kernel function should operate on the additional representation generated by this example generator.

Author:

Danilo Croce

Constructor Summary

Constructors

Constructor and Description
SequenceExampleGeneratorKernel()
SequenceExampleGeneratorKernel(int transitionsOrder, String transitionRepresentationName)

Method Summary

Methods

Modifier and Type	Method and Description
Example	generateExampleWithHistory(SequenceExample sequenceExample, SequencePath p, int elementId) At labeling time, this method allows to enrich a specific Example with the labels assigned by the classifier to the previous Examples
SequenceExample	generateSequenceExampleEnrichedWithHistory(SequenceExample sequenceExample) This method allows to enrich each Example from an input SequenceExample with the labels assigned by the classifier to the previous Examples
String	getTransitionRepresentationName()
int	getTransitionsOrder()
void	setTransitionRepresentationName(String transitionRepresentationName)
void	setTransitionsOrder(int transitionsOrder)

Methods inherited from class java.lang.Object

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

Constructor Detail

SequenceExampleGeneratorKernel

public SequenceExampleGeneratorKernel()

SequenceExampleGeneratorKernel

public SequenceExampleGeneratorKernel(int transitionsOrder,
                              String transitionRepresentationName)

Method Detail

generateExampleWithHistory

public Example generateExampleWithHistory(SequenceExample sequenceExample,
                                 SequencePath p,
                                 int elementId)

Description copied from interface: SequenceExampleGenerator

At labeling time, this method allows to enrich a specific Example with the labels assigned by the classifier to the previous Examples

Specified by:

generateExampleWithHistory in interface SequenceExampleGenerator

Parameters:

sequenceExample - The targeted sequence

p - the sequence of Label assigned from a classifier to the SequenceExamlpe

elementId - the offset of the targeted word in the sequence

Returns:

generateSequenceExampleEnrichedWithHistory

public SequenceExample generateSequenceExampleEnrichedWithHistory(SequenceExample sequenceExample)

Description copied from interface: SequenceExampleGenerator

This method allows to enrich each Example from an input SequenceExample with the labels assigned by the classifier to the previous Examples

Specified by:

generateSequenceExampleEnrichedWithHistory in interface SequenceExampleGenerator

Parameters:

sequenceExample - The input sequence

Returns:

getTransitionRepresentationName

public String getTransitionRepresentationName()

getTransitionsOrder

public int getTransitionsOrder()

Specified by:

getTransitionsOrder in interface SequenceExampleGenerator

Returns:

the number n of elements (in the sequence) whose labels are to be considered to enrich a targeted element

setTransitionRepresentationName

public void setTransitionRepresentationName(String transitionRepresentationName)

setTransitionsOrder

public void setTransitionsOrder(int transitionsOrder)