org.biojava.stats.svm
Class RadialBaseKernel
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
RadialBaseKernel
public RadialBaseKernel()
RadialBaseKernel
public RadialBaseKernel(SVMKernel nested,
double width)
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