RadialBaseKernel (biojava-legacy 1.9.5 API)

java.lang.Object
- org.biojava.stats.svm.NestedKernel
- - org.biojava.stats.svm.RadialBaseKernel

All Implemented Interfaces:

Serializable, SVMKernel
```
public class RadialBaseKernel
extends NestedKernel
```
This kernel computes the radial base kernel that corresponds to a gausian distribution.
The formula for this is exp( -||a - b|| / (2* width ^ 2)). The term a-b can be represented in an arbitrary feature space by using a nested kernel k, and becomes k(a, a) + k(b, b) - 2 * k(a, b).
As k(x, x) is required repeatedly, I suggest using a DiagonalCachingKernel as the immediately nested kernel function.

Author:

Matthew Pocock

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor Description

RadialBaseKernel()

RadialBaseKernel(SVMKernel nested, double width)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`double`	`evaluate(Object a, Object b)`	Return the dot product of two vectors in an arbitrary feature space.
`double`	`getWidth()`
`void`	`setWidth(double width)`
`String`	`toString()`

Methods inherited from class org.biojava.stats.svm.NestedKernel
getNestedKernel, setNestedKernel

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

RadialBaseKernel
```
public RadialBaseKernel()
```

RadialBaseKernel

public RadialBaseKernel(SVMKernel nested,
                        double width)

Method Detail
- evaluate
```
public double evaluate(Object a,
                       Object b)
```
  Description copied from interface: SVMKernel
  
  Return the dot product of two vectors in an arbitrary feature space. In this implementation, the `vectors' can actually be arbitrary objects.
- getWidth
```
public double getWidth()
```
- setWidth
```
public void setWidth(double width)
```
- toString
```
public String toString()
```
  Overrides:
  
  toString in class Object