it.uniroma2.sag.kelp.kernel

Class DirectKernel<T extends Representation>

java.lang.Object

it.uniroma2.sag.kelp.kernel.Kernel

it.uniroma2.sag.kelp.kernel.DirectKernel<T>

Direct Known Subclasses:

LinearKernel, PartialTreeKernel, SequenceKernel, ShortestPathKernel, SmoothedPartialTreeKernel, SubSetTreeKernel, SubTreeKernel

public abstract class DirectKernel<T extends Representation>
extends Kernel

It is a kernel that operates exploiting directly on a specific representation.

Author:

Simone Filice

Field Summary

Fields

Modifier and Type	Field and Description
protected String	representation

Constructor Summary

Constructors

Constructor and Description
DirectKernel()
DirectKernel(String representationIdentifier) Initializes a kernel operating directly on a specific representation identified by representationIdentifier

Method Summary

Modifier and Type	Method and Description
String	getRepresentation()
protected float	kernelComputation(Example exA, Example exB) Returns the kernel similarity between the given examples.
abstract float	kernelComputation(T repA, T repB) Computes the kernel similarity between two specific representations
void	setRepresentation(String representation)

Methods inherited from class it.uniroma2.sag.kelp.kernel.Kernel

disableCache, getKernelCache, getKernelComputations, getNumberOfHits, getNumberOfMisses, getSquaredNormCache, innerProduct, load, reset, save, setKernelCache, setSquaredNormCache, squaredNorm, squaredNormOfTheDifference

Methods inherited from class java.lang.Object

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

Field Detail

representation

protected String representation

Constructor Detail

DirectKernel

public DirectKernel(String representationIdentifier)

Initializes a kernel operating directly on a specific representation identified by representationIdentifier

Parameters:

representationIdentifier - the identifier of the representation to be directly exploited

DirectKernel

public DirectKernel()

Method Detail

getRepresentation

public String getRepresentation()

Returns:

the representation

setRepresentation

public void setRepresentation(String representation)

Parameters:

representation - the representation to set

kernelComputation

protected float kernelComputation(Example exA,
                                  Example exB)

Description copied from class: Kernel

Returns the kernel similarity between the given examples. This corresponds to the inner product in the implicit Reproducing Kernel Hilbert Space (RKHS)

Specified by:

kernelComputation in class Kernel

Parameters:

exA - the first example

exB - the second example

Returns:

the kernel operation between exA and exB

kernelComputation

public abstract float kernelComputation(T repA,
                                        T repB)

Computes the kernel similarity between two specific representations

Parameters:

repA - the first representation in the kernel similarity

repB - the second representation in the kernel similarity

Returns:

the kernel similarity