it.uniroma2.sag.kelp.kernel.examplepair

Class PreferenceKernel

java.lang.Object

it.uniroma2.sag.kelp.kernel.Kernel

it.uniroma2.sag.kelp.kernel.KernelComposition

it.uniroma2.sag.kelp.kernel.examplepair.PreferenceKernel

public class PreferenceKernel
extends KernelComposition

It is a kernel operating of ExamplePairs applying the following formula:
\(K( < x_1, x_2 >, < y_1,y_2 > ) = K(x_1, y_1) + K(x_2, y_2) - K(x_1, y_2) - K(x_2, y_1)\)
where K is another kernel the preference kernel relies on.
The preference kernel was firstly introduced in: [Shen and Joshi, 2003] L. Shen and A. K. Joshi. An SVM based voting algorithm with application to parse reranking. In Proc. of CoNLL. 2003.

Author:

Simone Filice

Field Summary

Fields inherited from class it.uniroma2.sag.kelp.kernel.KernelComposition

baseKernel

Constructor Summary

Constructors

Constructor and Description
PreferenceKernel()
PreferenceKernel(Kernel baseKernel)

Method Summary

Methods

Modifier and Type	Method and Description
protected float	kernelComputation(Example exA, Example exB) Returns the kernel similarity between the given examples.

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

getBaseKernel, setBaseKernel

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

disableCache, getKernelComputations, getNumberOfHits, getNumberOfMisses, innerProduct, reset, setKernelCache, setNormCache, squaredNorm, squaredNormOfTheDifference

Methods inherited from class java.lang.Object

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

Constructor Detail

PreferenceKernel

public PreferenceKernel(Kernel baseKernel)

PreferenceKernel

public PreferenceKernel()

Method Detail

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