Package weka.classifiers.functions.supportVector

Class RBFKernel

  • All Implemented Interfaces:
    java.io.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:
    Serialized Form

    • Constructor Detail

      • RBFKernel

        public RBFKernel()
        default constructor - does nothing.

      • RBFKernel

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

    • Method Detail

      • globalInfo

        public java.lang.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 java.util.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​(java.lang.String[] options)
                throws java.lang.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:
        java.lang.Exception - if an option is not supported

      • getOptions

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

      • buildKernel

        public void buildKernel​(Instances data)
                 throws java.lang.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:
        java.lang.Exception - if something goes wrong

      • toString

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