Package weka.classifiers.functions.supportVector

Class NormalizedPolyKernel

java.lang.Object

weka.classifiers.functions.supportVector.Kernel

weka.classifiers.functions.supportVector.CachedKernel

weka.classifiers.functions.supportVector.PolyKernel

weka.classifiers.functions.supportVector.NormalizedPolyKernel

All Implemented Interfaces:

Serializable, CapabilitiesHandler, OptionHandler, RevisionHandler

public class NormalizedPolyKernel
extends PolyKernel

The normalized polynomial kernel.
K(x,y) = <x,y>/sqrt(<x,x><y,y>) where <x,y> = PolyKernel(x,y)

Valid options are:

 -D
  Enables debugging output (if available) to be printed.
  (default: off)

 -C <num>
  The size of the cache (a prime number), 0 for full cache and 
  -1 to turn it off.
  (default: 250007)

 -E <num>
  The Exponent to use.
  (default: 1.0)

 -L
  Use lower-order terms.
  (default: no)

Version:

$Revision: 15561 $

Author:

Eibe Frank (eibe@cs.waikato.ac.nz)

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
NormalizedPolyKernel()	default constructor - does nothing
NormalizedPolyKernel(Instances dataset, int cacheSize, double exponent, boolean lowerOrder)	Creates a new NormalizedPolyKernel instance.

Method Summary

Modifier and Type	Method	Description
void	buildKernel(Instances data)	builds the kernel with the given data.
void	clean()	Frees the cache used by the kernel.
String	getRevision()	Returns the revision string.
String	globalInfo()	Returns a string describing the kernel
String	toString()	returns a string representation for the Kernel

Methods inherited from class weka.classifiers.functions.supportVector.PolyKernel

exponentTipText, getCapabilities, getExponent, getOptions, getUseLowerOrder, listOptions, setExponent, setOptions, setUseLowerOrder, useLowerOrderTipText

Methods inherited from class weka.classifiers.functions.supportVector.CachedKernel

cacheSizeTipText, eval, getCacheSize, numCacheHits, numEvals, setCacheSize

Methods inherited from class weka.classifiers.functions.supportVector.Kernel

debugTipText, forName, getChecksTurnedOff, getDebug, getDoNotCheckCapabilities, makeCopies, makeCopy, setChecksTurnedOff, setDebug, setDoNotCheckCapabilities

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

NormalizedPolyKernel

public NormalizedPolyKernel()

default constructor - does nothing

NormalizedPolyKernel

public NormalizedPolyKernel(Instances dataset,
 int cacheSize,
 double exponent,
 boolean lowerOrder)
                     throws Exception

Creates a new NormalizedPolyKernel instance.

Parameters:

dataset - the training dataset used.

cacheSize - the size of the cache (a prime number)

exponent - the exponent to use

lowerOrder - whether to use lower-order terms

Throws:

Exception - if something goes wrong

Method Details

buildKernel

public void buildKernel(Instances data)
                 throws Exception

builds the kernel with the given data. Initializes the kernel cache. The actual size of the cache in bytes is (64 * cacheSize).

Overrides:

buildKernel in class CachedKernel

Parameters:

data - the data to base the kernel on

Throws:

Exception - if something goes wrong

clean

public void clean()

Frees the cache used by the kernel.

Overrides:

clean in class CachedKernel

globalInfo

public String globalInfo()

Returns a string describing the kernel

Overrides:

globalInfo in class PolyKernel

Returns:

a description suitable for displaying in the explorer/experimenter gui

toString

public String toString()

returns a string representation for the Kernel

Overrides:

toString in class PolyKernel

Returns:

a string representaiton of the kernel

getRevision

public String getRevision()

Returns the revision string.

Specified by:

getRevision in interface RevisionHandler

Overrides:

getRevision in class PolyKernel

Returns:

the revision