Package org.biojava.stats.svm
Class NormalizingKernel
java.lang.Object
org.biojava.stats.svm.NestedKernel
org.biojava.stats.svm.NormalizingKernel
- All Implemented Interfaces:
Serializable
,SVMKernel
Performs a normalization on the results of a nested kernel.
This is equivalent to making the locations in feature space of the nested
kernel unit vectors lying on a unit sphere. The dot product in feature space
then becomes just cos theta
rather than
||a|| * ||b|| * cos theta
as both lengths are 1. The length of
a in the feature space of kernel k is sqrt( k(a, a) )
, so that
the normalizing kernel ends up calculating
k(a, b) / sqrt( k(a, a) * k(b, b) )
.
As the values of k(x, x) are required repeatedly, it may be worth making the nested kernel a DiagonalCachingKernel.
- Author:
- Thomas Down, Matthew Pocock
- See Also:
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Constructor Summary
Constructors -
Method Summary
Methods inherited from class org.biojava.stats.svm.NestedKernel
getNestedKernel, setNestedKernel
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Constructor Details
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NormalizingKernel
public NormalizingKernel() -
NormalizingKernel
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Method Details