smile.math.kernel

Class ProductKernel<T>

java.lang.Object

smile.math.kernel.ProductKernel<T>

All Implemented Interfaces:

java.io.Serializable, java.util.function.ToDoubleBiFunction<T,T>, MercerKernel<T>

public class ProductKernel<T>
extends java.lang.Object
implements MercerKernel<T>

The product kernel takes two kernels and combines them via k1(x, y) * k2(x, y).

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ProductKernel(MercerKernel<T> k1, MercerKernel<T> k2) Constructor.

Method Summary

Modifier and Type	Method and Description
double[]	hi() Returns the upper bound of hyperparameters.
double[]	hyperparameters() Returns the hyperparameters for tuning.
double	k(T x, T y) Kernel function.
double[]	kg(T x, T y) Computes the kernel and its gradient over hyperparameters.
double[]	lo() Returns the lower bound of hyperparameters.
MercerKernel<T>	of(double[] params) Returns the same kind kernel with the new hyperparameters.

Methods inherited from class java.lang.Object

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

Methods inherited from interface smile.math.kernel.MercerKernel

apply, applyAsDouble, K, K, KG

Constructor Detail

ProductKernel

public ProductKernel(MercerKernel<T> k1,
                     MercerKernel<T> k2)

Constructor.

Parameters:

k1 - the kernel to combine.

k2 - the kernel to combine.

Method Detail

k

public double k(T x,
                T y)

Description copied from interface: MercerKernel

Kernel function.

Specified by:

k in interface MercerKernel<T>

kg

public double[] kg(T x,
                   T y)

Description copied from interface: MercerKernel

Computes the kernel and its gradient over hyperparameters.

Specified by:

kg in interface MercerKernel<T>

of

public MercerKernel<T> of(double[] params)

Description copied from interface: MercerKernel

Returns the same kind kernel with the new hyperparameters.

Specified by:

of in interface MercerKernel<T>

hyperparameters

public double[] hyperparameters()

Description copied from interface: MercerKernel

Returns the hyperparameters for tuning.

Specified by:

hyperparameters in interface MercerKernel<T>

lo

public double[] lo()

Description copied from interface: MercerKernel

Returns the lower bound of hyperparameters.

Specified by:

lo in interface MercerKernel<T>

hi

public double[] hi()

Description copied from interface: MercerKernel

Returns the upper bound of hyperparameters.

Specified by:

hi in interface MercerKernel<T>