org.knime.base.node.mine.svm.kernel
Class PolynomialKernel

java.lang.Object
  org.knime.base.node.mine.svm.kernel.PolynomialKernel

All Implemented Interfaces:

Kernel

public class PolynomialKernel
extends Object
implements Kernel

Polynomial kernel of the form: (x * y + bias) ^ power.

Author:

Stefan Ciobaca, University of Konstanz, Nicolas Cebron, University of Konstanz

Constructor Summary

PolynomialKernel()

Method Summary

boolean	areValid(double[] params) test if the given combination of parameters is valid for this kernel.
double	evaluate(double[] a, double[] b) returns the value of the kernel given vectors a and b.
double	evaluate(DoubleVector a, DoubleVector b) evaluate the kernel.
double	getDefaultParameter(int index) return the default parameter at the given index.
int	getNumberParameters() 2 parameters (bias and power).
double	getParameter(int index) return the given parameter.
String	getParameterName(int index) get the names of the 2 parameters.
KernelFactory.KernelType	getType()
void	setParameter(int index, double value) sets the given parameter.

Methods inherited from class java.lang.Object

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

Constructor Detail

PolynomialKernel

public PolynomialKernel()

Method Detail

evaluate

public double evaluate(DoubleVector a,
                       DoubleVector b)

evaluate the kernel.

Specified by:

evaluate in interface Kernel

Parameters:

a - first vector

b - second vector

Returns:

the result

See Also:

DoubleVector

evaluate

public double evaluate(double[] a,
                       double[] b)

returns the value of the kernel given vectors a and b.

Specified by:

evaluate in interface Kernel

Parameters:

a - the first vector

b - the second vector

Returns:

the result of the kernel in a and b

getNumberParameters

public int getNumberParameters()

2 parameters (bias and power).

Specified by:

getNumberParameters in interface Kernel

Returns:

2

See Also:

Kernel.getNumberParameters()

getParameterName

public String getParameterName(int index)

get the names of the 2 parameters.

Specified by:

getParameterName in interface Kernel

Parameters:

index - first or second parameter?

Returns:

the name of the parameter

See Also:

Kernel.getParameterName(int)

areValid

public boolean areValid(double[] params)

Description copied from interface: Kernel

test if the given combination of parameters is valid for this kernel.

Specified by:

areValid in interface Kernel

Parameters:

params - the bias and power

Returns:

validity

See Also:

Kernel.areValid(double[])

setParameter

public void setParameter(int index,
                         double value)

Description copied from interface: Kernel

sets the given parameter.

Specified by:

setParameter in interface Kernel

Parameters:

index - first or second

value - which value

See Also:

Kernel.setParameter(int, double)

getDefaultParameter

public double getDefaultParameter(int index)

return the default parameter at the given index. index must be between 0 and getNumberParameters() - 1.

Specified by:

getDefaultParameter in interface Kernel

Parameters:

index - the parameter index.

Returns:

the parameter's default value

getParameter

public double getParameter(int index)

return the given parameter.

Specified by:

getParameter in interface Kernel

Parameters:

index - first or second?

Returns:

value of kernel parameter

See Also:

Kernel.getParameter(int)

getType

public KernelFactory.KernelType getType()

Specified by:

getType in interface Kernel

Returns:

the KernelFactory.KernelType of the Kernel