weka.filters.unsupervised.attribute
Class Normalize

java.lang.Object
  extended by weka.filters.Filter
      extended by weka.filters.unsupervised.attribute.PotentialClassIgnorer
          extended by weka.filters.unsupervised.attribute.Normalize
All Implemented Interfaces:
java.io.Serializable, CapabilitiesHandler, OptionHandler, 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: 1.12 $
Author:
Eibe Frank (eibe@cs.waikato.ac.nz), FracPete (fracpete at waikato dot ac dot nz)
See Also:
Serialized Form

Constructor Summary
Normalize()
           
 
Method Summary
 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.
 java.lang.String[] getOptions()
          Gets the current settings of the filter.
 double getScale()
          Get the scaling factor.
 double getTranslation()
          Get the translation.
 java.lang.String globalInfo()
          Returns a string describing this filter.
 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[] args)
          Main method for running this filter.
 java.lang.String scaleTipText()
          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 setScale(double value)
          Sets the scaling factor.
 void setTranslation(double value)
          Sets the translation.
 java.lang.String toSource(java.lang.String className, Instances data)
          Returns a string that describes the filter as source.
 java.lang.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, numPendingOutput, output, outputPeek, 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 java.lang.String globalInfo()
Returns a string describing this filter.

Returns:
a description of the filter 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 PotentialClassIgnorer
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:

 -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:
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
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 java.lang.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:
java.lang.Exception - if the input format can't be set successfully

input

public boolean input(Instance instance)
              throws java.lang.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:
java.lang.Exception - if an error occurs
java.lang.IllegalStateException - if no input format has been set.

batchFinished

public boolean batchFinished()
                      throws java.lang.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:
java.lang.Exception - if an error occurs
java.lang.IllegalStateException - if no input structure has been defined

toSource

public java.lang.String toSource(java.lang.String className,
                                 Instances data)
                          throws java.lang.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:
java.lang.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 java.lang.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 java.lang.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

main

public static void main(java.lang.String[] args)
Main method for running this filter.

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