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## weka.classifiers.functions.supportVector
Class CachedKernel

    java.lang.Object
      weka.classifiers.functions.supportVector.Kernel
          weka.classifiers.functions.supportVector.CachedKernel

All Implemented Interfaces:
  java.io.Serializable, CapabilitiesHandler, OptionHandler, RevisionHandler

Direct Known Subclasses:
  PolyKernel, Puk, RBFKernel

    public abstract class CachedKernel

extends Kernel

Base class for RBFKernel and PolyKernel that implements a simple LRU. (least-recently-used) cache if the cache size is set to a value > 0. Otherwise it uses a full cache.

Version:
  $Revision: 4549 $
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), Steven Hugg (hugg@fasterlight.com) (refactored, LRU cache), Bernhard Pfahringer (bernhard@cs.waikato.ac.nz) (full cache)
See Also:
  Serialized Form

Constructor Summary
`CachedKernel()` default constructor - does nothing.

Method Summary
`void` | `buildKernel(Instances data)` builds the kernel with the given data.
`java.lang.String` | `cacheSizeTipText()` Returns the tip text for this property
`void` | `clean()` Frees the cache used by the kernel.
`double` | `eval(int id1, int id2, Instance inst1)` Implements the abstract function of Kernel using the cache.
`int` | `getCacheSize()` Gets the size of the cache
`java.lang.String[]` | `getOptions()` Gets the current settings of the Kernel.
`java.util.Enumeration` | `listOptions()` Returns an enumeration describing the available options.
`int` | `numCacheHits()` Returns the number of cache hits on dot products.
`int` | `numEvals()` Returns the number of time Eval has been called.
`void` | `setCacheSize(int value)` Sets the size of the cache to use (a prime number)
`void` | `setOptions(java.lang.String[] options)` Parses a given list of options.

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

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

Constructor Detail

### CachedKernel

    public CachedKernel()

  default constructor - does nothing.

Method Detail

### listOptions

    public java.util.Enumeration listOptions()

  Returns an enumeration describing the available options.

  Specified by:
    `listOptions` in interface `OptionHandler`
  Overrides:
    `listOptions` in class `Kernel`
  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.

  Specified by:
    `setOptions` in interface `OptionHandler`
  Overrides:
    `setOptions` in class `Kernel`
  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 `Kernel`
  Returns:
    an array of strings suitable for passing to setOptions

### eval

    public double eval(int id1,
                       int id2,
                       Instance inst1)
                throws java.lang.Exception

  Implements the abstract function of Kernel using the cache. This method uses the evaluate() method to do the actual dot product.

  Specified by:
    `eval` in class `Kernel`
  Parameters:
    `id1` - the index of the first instance in the dataset
    `id2` - the index of the second instance in the dataset
    `inst1` - the instance corresponding to id1 (used if id1 == -1)
  Returns:
    the result of the kernel function
  Throws:
    `java.lang.Exception` - if something goes wrong

### numEvals

    public int numEvals()

  Returns the number of time Eval has been called.

  Specified by:
    `numEvals` in class `Kernel`
  Returns:
    the number of kernel evaluation.

### numCacheHits

    public int numCacheHits()

  Returns the number of cache hits on dot products.

  Specified by:
    `numCacheHits` in class `Kernel`
  Returns:
    the number of cache hits.

### clean

    public void clean()

  Frees the cache used by the kernel.

  Specified by:
    `clean` in class `Kernel`

### setCacheSize

    public void setCacheSize(int value)

  Sets the size of the cache to use (a prime number)

  Parameters:
    `value` - the size of the cache

### getCacheSize

    public int getCacheSize()

  Gets the size of the cache

  Returns:
    the cache size

### cacheSizeTipText

    public java.lang.String cacheSizeTipText()

  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 `Kernel`
  Parameters:
    `data` - the data to base the kernel on
  Throws:
    `java.lang.Exception` - if something goes wrong

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