Package weka.classifiers.functions.supportVector

Class RBFKernel

java.lang.Object
weka.classifiers.functions.supportVector.Kernel
weka.classifiers.functions.supportVector.CachedKernel
weka.classifiers.functions.supportVector.RBFKernel
All Implemented Interfaces:
Serializable, CapabilitiesHandler, OptionHandler, RevisionHandler
Direct Known Subclasses:
MIRBFKernel
public class RBFKernel extends CachedKernel
The RBF kernel. K(x, y) = e^-(gamma * <x-y, x-y>^2)

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)
 -G <num>
  The Gamma parameter.
  (default: 0.01)
Version:
$Revision: 5518 $
Author:
Eibe Frank (eibe@cs.waikato.ac.nz), Shane Legg (shane@intelligenesis.net) (sparse vector code), Stuart Inglis (stuart@reeltwo.com) (sparse vector code), J. Lindgren (jtlindgr{at}cs.helsinki.fi) (RBF kernel)
See Also:

  • Constructor Details

    • RBFKernel

      public RBFKernel()
      default constructor - does nothing.

    • RBFKernel

      public RBFKernel(Instances data, int cacheSize, double gamma) throws Exception
      Constructor. Initializes m_kernelPrecalc[].
      Parameters:
      data - the data to use
      cacheSize - the size of the cache
      gamma - the bandwidth
      Throws:
      Exception - if something goes wrong

  • Method Details

    • globalInfo

      public String globalInfo()
      Returns a string describing the kernel
      Specified by:
      globalInfo in class Kernel
      Returns:
      a description suitable for displaying in the explorer/experimenter gui

    • listOptions

      public Enumeration listOptions()
      Returns an enumeration describing the available options.
      Specified by:
      listOptions in interface OptionHandler
      Overrides:
      listOptions in class CachedKernel
      Returns:
      an enumeration of all the available options.

    • setOptions

      public void setOptions(String[] options) throws Exception
      Parses a given list of options.

      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)
       -G <num>
  The Gamma parameter.
  (default: 0.01)
      Specified by:
      setOptions in interface OptionHandler
      Overrides:
      setOptions in class CachedKernel
      Parameters:
      options - the list of options as an array of strings
      Throws:
      Exception - if an option is not supported

    • getOptions

      public String[] getOptions()
      Gets the current settings of the Kernel.
      Specified by:
      getOptions in interface OptionHandler
      Overrides:
      getOptions in class CachedKernel
      Returns:
      an array of strings suitable for passing to setOptions

    • setGamma

      public void setGamma(double value)
      Sets the gamma value.
      Parameters:
      value - the gamma value

    • getGamma

      public double getGamma()
      Gets the gamma value.
      Returns:
      the gamma value

    • gammaTipText

      public String gammaTipText()
      Returns the tip text for this property
      Returns:
      tip text for this property suitable for displaying in the explorer/experimenter gui

    • getCapabilities

      public Capabilities getCapabilities()
      Returns the Capabilities of this kernel.
      Specified by:
      getCapabilities in interface CapabilitiesHandler
      Overrides:
      getCapabilities in class Kernel
      Returns:
      the capabilities of this object
      See Also:

    • buildKernel

      public void buildKernel(Instances data) throws Exception
      builds the kernel with the given data. Initializes the kernel cache. The actual size of the cache in bytes is (64 * cacheSize).
      Overrides:
      buildKernel in class CachedKernel
      Parameters:
      data - the data to base the kernel on
      Throws:
      Exception - if something goes wrong

    • toString

      public String toString()
      returns a string representation for the Kernel
      Overrides:
      toString in class Object
      Returns:
      a string representaiton of the kernel

    • getRevision

      public String getRevision()
      Returns the revision string.
      Specified by:
      getRevision in interface RevisionHandler
      Overrides:
      getRevision in class Kernel
      Returns:
      the revision