edu.udo.cs.yale.generator
Class NormalizationGenerator

java.lang.Object
  edu.udo.cs.yale.generator.FeatureGenerator
      edu.udo.cs.yale.generator.SingularNumericalGenerator
          edu.udo.cs.yale.generator.NormalizationGenerator

public class NormalizationGenerator
extends SingularNumericalGenerator

Creates the normalized value of all input attributes, i.e. calculates
(value - min) / (max - min) for normalization between 0 and 1 and (value - min) / (max - min) * (MAX - MIN) + MIN for normalization between MIN and MAX.

Version:

$Id: NormalizationGenerator.java,v 2.13 2006/03/21 15:35:40 ingomierswa Exp $

Author:

Simon Fischer, Ingo Mierswa

Field Summary

static java.lang.String	FUNCTION_NAME
private double	max
private double	min

Fields inherited from class edu.udo.cs.yale.generator.FeatureGenerator

resultAttributes, SELECTION_MODE_ALL, SELECTION_MODE_RESTRICTIVE

Constructor Summary

NormalizationGenerator()
Creates a new normalization generator.

NormalizationGenerator(double min, double max)
Creates a new normalization operator which normalizes the values between min and max.

Method Summary

double	calculateValue(double value) Subclasses have to implement this method to calculate the function result.
void	generate(DataRow data) Generates the new attribute values for the example e and returns the new attribute values as doubles.
java.lang.String	getFunction() Sets the function name.
FeatureGenerator	newInstance() Subclasses must implement this method so that a new instance of this generator class is returned.
void	setFunction(java.lang.String name) Sets the function name.

Methods inherited from class edu.udo.cs.yale.generator.SingularNumericalGenerator

getInputAttributes, getInputCandidates, getOutputAttributes, toString

Methods inherited from class edu.udo.cs.yale.generator.FeatureGenerator

argumentsSet, checkCompatibility, createGeneratorForFunction, equals, generateAll, getArgument, getExampleTable, getSelectionMode, selectGenerator, setArguments, setExampleTable, setSelectionMode

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

FUNCTION_NAME

public static final java.lang.String FUNCTION_NAME

See Also:

Constant Field Values

min

private double min

max

private double max

Constructor Detail

NormalizationGenerator

public NormalizationGenerator()

Creates a new normalization generator. This generator normalizes the values between 0 and 1.

NormalizationGenerator

public NormalizationGenerator(double min,
                              double max)

Creates a new normalization operator which normalizes the values between min and max.

Method Detail

newInstance

public FeatureGenerator newInstance()

Description copied from class: FeatureGenerator

Subclasses must implement this method so that a new instance of this generator class is returned. The arguments and the example table will not be cloned and thus be null. This kind of clone is needed as generating algorithms must be able to clone generators form their pool without changing the arguments already set for the others.

Specified by:

newInstance in class FeatureGenerator

calculateValue

public double calculateValue(double value)

Description copied from class: SingularNumericalGenerator

Subclasses have to implement this method to calculate the function result.

Specified by:

calculateValue in class SingularNumericalGenerator

generate

public void generate(DataRow data)
              throws GenerationException

Description copied from class: FeatureGenerator

Generates the new attribute values for the example e and returns the new attribute values as doubles. e.getAttribute(getArgument(i)) is the correct way to access argument i. If the according attribute's type is VALUE_SERIES, the end index can be determined by i_end = getExampleTable().getBlockEndIndex(getArgument(i)). Thus all values of the series can be accessed using indices i through i_end.

Overrides:

generate in class SingularNumericalGenerator

Throws:

GenerationException

setFunction

public void setFunction(java.lang.String name)

Description copied from class: FeatureGenerator

Sets the function name. This method is only useful if subclasses can generate more than one function. (like the BasicArithmeticOperationGenerator).

Specified by:

setFunction in class FeatureGenerator

getFunction

public java.lang.String getFunction()

Description copied from class: FeatureGenerator

Sets the function name. This method is only useful if subclasses can generate more than one function. (like the BasicArithmeticOperationGenerator).

Specified by:

getFunction in class FeatureGenerator