weka.filters.unsupervised.instance
Class Randomize

java.lang.Object
  extended by weka.filters.Filter
      extended by weka.filters.unsupervised.instance.Randomize
All Implemented Interfaces:
java.io.Serializable, CapabilitiesHandler, OptionHandler, UnsupervisedFilter

public class Randomize
extends Filter
implements UnsupervisedFilter, OptionHandler

Randomly shuffles the order of instances passed through it. The random number generator is reset with the seed value whenever a new set of instances is passed in.

Valid options are:

 -S <num>
  Specify the random number seed (default 42)

Version:
$Revision: 1.6 $
Author:
Len Trigg (trigg@cs.waikato.ac.nz)
See Also:
Serialized Form

Constructor Summary
Randomize()
           
 
Method Summary
 boolean batchFinished()
          Signify that this batch of input to the filter is finished.
 Capabilities getCapabilities()
          Returns the Capabilities of this filter.
 java.lang.String[] getOptions()
          Gets the current settings of the filter.
 int getRandomSeed()
          Get the random number generator seed value.
 java.lang.String globalInfo()
          Returns a string describing this classifier
 boolean input(Instance instance)
          Input an instance for filtering.
 java.util.Enumeration listOptions()
          Returns an enumeration describing the available options.
static void main(java.lang.String[] argv)
          Main method for testing this class.
 java.lang.String randomSeedTipText()
          Returns the tip text for this property
 boolean setInputFormat(Instances instanceInfo)
          Sets the format of the input instances.
 void setOptions(java.lang.String[] options)
          Parses a given list of options.
 void setRandomSeed(int newRandomSeed)
          Set the random number generator seed value.
 
Methods inherited from class weka.filters.Filter
batchFilterFile, filterFile, getCapabilities, getOutputFormat, isFirstBatchDone, isNewBatch, isOutputFormatDefined, makeCopies, makeCopy, numPendingOutput, output, outputPeek, toString, useFilter, wekaStaticWrapper
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

Randomize

public Randomize()
Method Detail

globalInfo

public java.lang.String globalInfo()
Returns a string describing this classifier

Returns:
a description of the classifier 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
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:

 -S <num>
  Specify the random number seed (default 42)

Specified by:
setOptions in interface OptionHandler
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 filter.

Specified by:
getOptions in interface OptionHandler
Returns:
an array of strings suitable for passing to setOptions

randomSeedTipText

public java.lang.String randomSeedTipText()
Returns the tip text for this property

Returns:
tip text for this property suitable for displaying in the explorer/experimenter gui

getRandomSeed

public int getRandomSeed()
Get the random number generator seed value.

Returns:
random number generator seed value.

setRandomSeed

public void setRandomSeed(int newRandomSeed)
Set the random number generator seed value.

Parameters:
newRandomSeed - value to use as the random number generator seed.

getCapabilities

public Capabilities getCapabilities()
Returns the Capabilities of this filter.

Specified by:
getCapabilities in interface CapabilitiesHandler
Overrides:
getCapabilities in class Filter
Returns:
the capabilities of this object
See Also:
Capabilities

setInputFormat

public boolean setInputFormat(Instances instanceInfo)
                       throws java.lang.Exception
Sets the format of the input instances.

Overrides:
setInputFormat in class Filter
Parameters:
instanceInfo - an Instances object containing the input instance structure (any instances contained in the object are ignored - only the structure is required).
Returns:
true if the outputFormat may be collected immediately
Throws:
java.lang.Exception - if format cannot be processed

input

public boolean input(Instance instance)
Input an instance for filtering. Filter requires all training instances be read before producing output.

Overrides:
input in class Filter
Parameters:
instance - the input instance
Returns:
true if the filtered instance may now be collected with output().
Throws:
java.lang.IllegalStateException - if no input structure has been defined

batchFinished

public boolean batchFinished()
Signify that this batch of input to the filter is finished. If the filter requires all instances prior to filtering, output() may now be called to retrieve the filtered instances. Any subsequent instances filtered should be filtered based on setting obtained from the first batch (unless the setInputFormat has been re-assigned or new options have been set). This implementation randomizes all the instances received in the batch.

Overrides:
batchFinished in class Filter
Returns:
true if there are instances pending output
Throws:
java.lang.IllegalStateException - if no input format has been set.

main

public static void main(java.lang.String[] argv)
Main method for testing this class.

Parameters:
argv - should contain arguments to the filter: use -h for help