Class NormalizedPolyKernel
- java.lang.Object
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- weka.classifiers.functions.supportVector.Kernel
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- weka.classifiers.functions.supportVector.CachedKernel
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- weka.classifiers.functions.supportVector.PolyKernel
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- weka.classifiers.functions.supportVector.NormalizedPolyKernel
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- All Implemented Interfaces:
java.io.Serializable
,CapabilitiesHandler
,OptionHandler
,RevisionHandler
public class NormalizedPolyKernel extends PolyKernel
The normalized polynomial kernel.
K(x,y) = <x,y>/sqrt(<x,x><y,y>) where <x,y> = PolyKernel(x,y) Valid options are:-D Enables debugging output (if available) to be printed. (default: off)
-no-checks Turns off all checks - use with caution! (default: checks on)
-C <num> The size of the cache (a prime number), 0 for full cache and -1 to turn it off. (default: 250007)
-E <num> The Exponent to use. (default: 1.0)
-L Use lower-order terms. (default: no)
- Version:
- $Revision: 1.8 $
- Author:
- Eibe Frank (eibe@cs.waikato.ac.nz)
- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor Description NormalizedPolyKernel()
default constructor - does nothingNormalizedPolyKernel(Instances dataset, int cacheSize, double exponent, boolean lowerOrder)
Creates a newNormalizedPolyKernel
instance.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description double
eval(int id1, int id2, Instance inst1)
Computes the result of the kernel function for two instances.java.lang.String
getRevision()
Returns the revision string.java.lang.String
globalInfo()
Returns a string describing the kernelvoid
setExponent(double value)
Sets the exponent value (must be different from 1.0).java.lang.String
toString()
returns a string representation for the Kernel-
Methods inherited from class weka.classifiers.functions.supportVector.PolyKernel
clean, exponentTipText, getCapabilities, getExponent, getOptions, getUseLowerOrder, listOptions, setOptions, setUseLowerOrder, useLowerOrderTipText
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Methods inherited from class weka.classifiers.functions.supportVector.CachedKernel
buildKernel, cacheSizeTipText, getCacheSize, numCacheHits, numEvals, setCacheSize
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Methods inherited from class weka.classifiers.functions.supportVector.Kernel
checksTurnedOffTipText, debugTipText, forName, getChecksTurnedOff, getDebug, makeCopies, makeCopy, setChecksTurnedOff, setDebug
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Constructor Detail
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NormalizedPolyKernel
public NormalizedPolyKernel()
default constructor - does nothing
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NormalizedPolyKernel
public NormalizedPolyKernel(Instances dataset, int cacheSize, double exponent, boolean lowerOrder) throws java.lang.Exception
Creates a newNormalizedPolyKernel
instance.- Parameters:
dataset
- the training dataset used.cacheSize
- the size of the cache (a prime number)exponent
- the exponent to uselowerOrder
- whether to use lower-order terms- Throws:
java.lang.Exception
- if something goes wrong
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Method Detail
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globalInfo
public java.lang.String globalInfo()
Returns a string describing the kernel- Overrides:
globalInfo
in classPolyKernel
- Returns:
- a description suitable for displaying in the explorer/experimenter gui
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eval
public double eval(int id1, int id2, Instance inst1) throws java.lang.Exception
Computes the result of the kernel function for two instances. If id1 == -1, eval use inst1 instead of an instance in the dataset. Redefines the eval function of PolyKernel.- Overrides:
eval
in classCachedKernel
- Parameters:
id1
- the index of the first instance in the datasetid2
- the index of the second instance in the datasetinst1
- the instance corresponding to id1 (used if id1 == -1)- Returns:
- the result of the kernel function
- Throws:
java.lang.Exception
- if something goes wrong
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setExponent
public void setExponent(double value)
Sets the exponent value (must be different from 1.0).- Overrides:
setExponent
in classPolyKernel
- Parameters:
value
- the exponent value
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toString
public java.lang.String toString()
returns a string representation for the Kernel- Overrides:
toString
in classPolyKernel
- Returns:
- a string representaiton of the kernel
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getRevision
public java.lang.String getRevision()
Returns the revision string.- Specified by:
getRevision
in interfaceRevisionHandler
- Overrides:
getRevision
in classPolyKernel
- Returns:
- the revision
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