weka.classifiers.mi.supportVector

Class MIRBFKernel

java.lang.Object

weka.classifiers.functions.supportVector.Kernel

weka.classifiers.functions.supportVector.CachedKernel

weka.classifiers.functions.supportVector.RBFKernel

weka.classifiers.mi.supportVector.MIRBFKernel

All Implemented Interfaces:

Serializable, CapabilitiesHandler, MultiInstanceCapabilitiesHandler, OptionHandler, RevisionHandler

public class MIRBFKernel
extends RBFKernel
implements MultiInstanceCapabilitiesHandler

The RBF kernel. K(x, y) = e^-(gamma * <x-y, x-y>^2)

Valid options are:

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

 -no-checks
  Turns off all checks - use with caution!
  (default: checks on)

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

 -G <num>
  The Gamma parameter.
  (default: 0.01)

Version:

$Revision: 1.4 $

Author:

Eibe Frank (eibe@cs.waikato.ac.nz), Shane Legg (shane@intelligenesis.net) (sparse vector code), Stuart Inglis (stuart@reeltwo.com) (sparse vector code), J. Lindgren (jtlindgr{at}cs.helsinki.fi) (RBF kernel), Lin Dong (ld21@cs.waikato.ac.nz) (MIkernel)

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected double[][]	m_kernelPrecalc The precalculated dotproducts of <inst_i,inst_i>

Fields inherited from class weka.classifiers.functions.supportVector.RBFKernel

m_gamma

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

m_cacheHits, m_cacheSize, m_cacheSlots, m_kernelEvals, m_kernelMatrix, m_keys, m_numInsts, m_storage

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

m_ChecksTurnedOff, m_data, m_Debug

Constructor Summary

Constructors

Constructor and Description
MIRBFKernel() default constructor - does nothing.
MIRBFKernel(Instances data, int cacheSize, double gamma) Constructor.

Method Summary

Modifier and Type	Method and Description
void	buildKernel(Instances data) builds the kernel with the given data.
protected double	evaluate(int id1, int id2, Instance inst1) This method is overridden in subclasses to implement specific kernels.
Capabilities	getCapabilities() Returns the Capabilities of this kernel.
Capabilities	getMultiInstanceCapabilities() Returns the capabilities of this multi-instance kernel for the relational data.
String	getRevision() Returns the revision string.
protected void	initVars(Instances data) initializes variables etc.

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

gammaTipText, getGamma, getOptions, globalInfo, listOptions, setGamma, setOptions, toString

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

cacheSizeTipText, clean, dotProd, eval, getCacheSize, numCacheHits, numEvals, setCacheSize

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

checksTurnedOffTipText, debugTipText, forName, getChecksTurnedOff, getDebug, makeCopies, makeCopy, setChecksTurnedOff, setDebug

Methods inherited from class java.lang.Object

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

Field Detail

m_kernelPrecalc

protected double[][] m_kernelPrecalc

The precalculated dotproducts of <inst_i,inst_i>

Constructor Detail

MIRBFKernel

public MIRBFKernel()

default constructor - does nothing.

MIRBFKernel

public MIRBFKernel(Instances data,
                   int cacheSize,
                   double gamma)
            throws Exception

Constructor.

Parameters:

data - the data to use

cacheSize - the size of the cache

gamma - the bandwidth

Throws:

Exception - if something goes wrong

Method Detail

evaluate

protected double evaluate(int id1,
                          int id2,
                          Instance inst1)
                   throws Exception

Description copied from class: CachedKernel

This method is overridden in subclasses to implement specific kernels.

Overrides:

evaluate in class RBFKernel

Parameters:

id1 - the index of instance 1

id2 - the index of instance 2

inst1 - the instance 1 object

Returns:

the dot product

Throws:

Exception - if something goes wrong

initVars

protected void initVars(Instances data)

initializes variables etc.

Overrides:

initVars in class RBFKernel

Parameters:

data - the data to use

getCapabilities

public Capabilities getCapabilities()

Returns the Capabilities of this kernel.

Specified by:

getCapabilities in interface CapabilitiesHandler

Overrides:

getCapabilities in class RBFKernel

Returns:

the capabilities of this object

See Also:

Capabilities

getMultiInstanceCapabilities

public Capabilities getMultiInstanceCapabilities()

Returns the capabilities of this multi-instance kernel for the relational data.

Specified by:

getMultiInstanceCapabilities in interface MultiInstanceCapabilitiesHandler

Returns:

the capabilities of this object

See Also:

Capabilities

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 RBFKernel

Parameters:

data - the data to base the kernel on

Throws:

Exception - if something goes wrong

getRevision

public String getRevision()

Returns the revision string.

Specified by:

getRevision in interface RevisionHandler

Overrides:

getRevision in class RBFKernel

Returns:

the revision