weka.filters.unsupervised.attribute

Class Normalize

java.lang.Object

weka.filters.Filter

weka.filters.unsupervised.attribute.PotentialClassIgnorer

weka.filters.unsupervised.attribute.Normalize

All Implemented Interfaces:

Serializable, CapabilitiesHandler, OptionHandler, RevisionHandler, Sourcable, UnsupervisedFilter

public class Normalize
extends PotentialClassIgnorer
implements UnsupervisedFilter, Sourcable, OptionHandler

Normalizes all numeric values in the given dataset (apart from the class attribute, if set). The resulting values are by default in [0,1] for the data used to compute the normalization intervals. But with the scale and translation parameters one can change that, e.g., with scale = 2.0 and translation = -1.0 you get values in the range [-1,+1].

Valid options are:

 -unset-class-temporarily
  Unsets the class index temporarily before the filter is
  applied to the data.
  (default: no)
 

 -S <num>
  The scaling factor for the output range.
  (default: 1.0)
 

 -T <num>
  The translation of the output range.
  (default: 0.0)
 

Version:

$Revision: 10215 $

Author:

Eibe Frank (eibe@cs.waikato.ac.nz), FracPete (fracpete at waikato dot ac dot nz)

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
Normalize()

Method Summary

Methods

Modifier and Type	Method and Description
boolean	batchFinished() Signify that this batch of input to the filter is finished.
Capabilities	getCapabilities() Returns the Capabilities of this filter.
double[]	getMaxArray() Returns the calculated maximum values for the attributes in the data.
double[]	getMinArray() Returns the calculated minimum values for the attributes in the data.
String[]	getOptions() Gets the current settings of the filter.
String	getRevision() Returns the revision string.
double	getScale() Get the scaling factor.
double	getTranslation() Get the translation.
String	globalInfo() Returns a string describing this filter.
boolean	input(Instance instance) Input an instance for filtering.
Enumeration<Option>	listOptions() Returns an enumeration describing the available options.
static void	main(String[] args) Main method for running this filter.
String	scaleTipText() Returns the tip text for this property.
boolean	setInputFormat(Instances instanceInfo) Sets the format of the input instances.
void	setOptions(String[] options) Parses a given list of options.
void	setScale(double value) Sets the scaling factor.
void	setTranslation(double value) Sets the translation.
String	toSource(String className, Instances data) Returns a string that describes the filter as source.
String	translationTipText() Returns the tip text for this property.

Methods inherited from class weka.filters.unsupervised.attribute.PotentialClassIgnorer

getIgnoreClass, getOutputFormat, ignoreClassTipText, setIgnoreClass

Methods inherited from class weka.filters.Filter

batchFilterFile, filterFile, getCapabilities, isFirstBatchDone, isNewBatch, isOutputFormatDefined, makeCopies, makeCopy, mayRemoveInstanceAfterFirstBatchDone, numPendingOutput, output, outputPeek, runFilter, toString, useFilter, wekaStaticWrapper

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Normalize

public Normalize()

Method Detail

globalInfo

public String globalInfo()

Returns a string describing this filter.

Returns:

a description of the filter suitable for displaying in the explorer/experimenter gui

listOptions

public Enumeration<Option> listOptions()

Returns an enumeration describing the available options.

Specified by:

listOptions in interface OptionHandler

Overrides:

listOptions in class PotentialClassIgnorer

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:

 -unset-class-temporarily
  Unsets the class index temporarily before the filter is
  applied to the data.
  (default: no)
 

 -S <num>
  The scaling factor for the output range.
  (default: 1.0)
 

 -T <num>
  The translation of the output range.
  (default: 0.0)
 

Specified by:

setOptions in interface OptionHandler

Overrides:

setOptions in class PotentialClassIgnorer

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 filter.

Specified by:

getOptions in interface OptionHandler

Overrides:

getOptions in class PotentialClassIgnorer

Returns:

an array of strings suitable for passing to setOptions

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 Exception

Sets the format of the input instances.

Overrides:

setInputFormat in class PotentialClassIgnorer

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:

Exception - if the input format can't be set successfully

input

public boolean input(Instance instance)
              throws Exception

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:

Exception - if an error occurs

IllegalStateException - if no input format has been set.

batchFinished

public boolean batchFinished()
                      throws Exception

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.

Overrides:

batchFinished in class Filter

Returns:

true if there are instances pending output

Throws:

Exception - if an error occurs

IllegalStateException - if no input structure has been defined

toSource

public String toSource(String className,
              Instances data)
                throws Exception

Returns a string that describes the filter as source. The filter will be contained in a class with the given name (there may be auxiliary classes), and will contain two methods with these signatures:

 
 // converts one row
 public static Object[] filter(Object[] i);
 // converts a full dataset (first dimension is row index)
 public static Object[][] filter(Object[][] i);
 
 

where the array i contains elements that are either Double, String, with missing values represented as null. The generated code is public domain and comes with no warranty.

Specified by:

toSource in interface Sourcable

Parameters:

className - the name that should be given to the source class.

data - the dataset used for initializing the filter

Returns:

the object source described by a string

Throws:

Exception - if the source can't be computed

getMinArray

public double[] getMinArray()

Returns the calculated minimum values for the attributes in the data.

Returns:

the array with the minimum values

getMaxArray

public double[] getMaxArray()

Returns the calculated maximum values for the attributes in the data.

Returns:

the array with the maximum values

scaleTipText

public String scaleTipText()

Returns the tip text for this property.

Returns:

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

getScale

public double getScale()

Get the scaling factor.

Returns:

the factor

setScale

public void setScale(double value)

Sets the scaling factor.

Parameters:

value - the scaling factor

translationTipText

public String translationTipText()

Returns the tip text for this property.

Returns:

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

getTranslation

public double getTranslation()

Get the translation.

Returns:

the translation

setTranslation

public void setTranslation(double value)

Sets the translation.

Parameters:

value - the translation

getRevision

public String getRevision()

Returns the revision string.

Specified by:

getRevision in interface RevisionHandler

Overrides:

getRevision in class Filter

Returns:

the revision

main

public static void main(String[] args)

Main method for running this filter.

Parameters:

args - should contain arguments to the filter, use -h for help