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## 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:
  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: 5450 $
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 Summary
`RBFKernel()` default constructor - does nothing.
`RBFKernel(Instances data, int cacheSize, double gamma)` Constructor.

Method Summary
`void` | `buildKernel(Instances data)` builds the kernel with the given data.
`java.lang.String` | `gammaTipText()` Returns the tip text for this property
`Capabilities` | `getCapabilities()` Returns the Capabilities of this kernel.
`double` | `getGamma()` Gets the gamma value.
`java.lang.String[]` | `getOptions()` Gets the current settings of the Kernel.
`java.lang.String` | `getRevision()` Returns the revision string.
`java.lang.String` | `globalInfo()` Returns a string describing the kernel
`java.util.Enumeration` | `listOptions()` Returns an enumeration describing the available options.
`void` | `setGamma(double value)` Sets the gamma value.
`void` | `setOptions(java.lang.String[] options)` Parses a given list of options.
`java.lang.String` | `toString()` returns a string representation for the Kernel

Methods inherited from class weka.classifiers.functions.supportVector.CachedKernel
`cacheSizeTipText, clean, eval, getCacheSize, numCacheHits, numEvals, setCacheSize`

Methods inherited from class weka.classifiers.functions.supportVector.Kernel
`checksTurnedOffTipText, debugTipText, forName, getChecksTurnedOff, getDebug, makeCopies, makeCopy, setChecksTurnedOff, setDebug`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

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

### 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:
    `Capabilities`

### 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

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

  Specified by:
    `getRevision` in interface `RevisionHandler`
  Overrides:
    `getRevision` in class `Kernel`
  Returns:
    the revision

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