edu.udo.cs.yale.operator.preprocessing.discretization
Class FrequencyDiscretizer

java.lang.Object
  extended by edu.udo.cs.yale.operator.Operator
      extended by edu.udo.cs.yale.operator.preprocessing.discretization.FrequencyDiscretizer
All Implemented Interfaces:
ConfigurationListener

public class FrequencyDiscretizer
extends Operator

An example filter that discretizes all numeric attributes in the dataset into nominal attributes. This discretization is performed by equal frequency binning. The number of bins is determined by a parameter, or, chooseable via another parameter, by the square root of the number of examples with non-missing values (calculated for every single attribute). Skips all special attributes including the label.

Version:
$Id: FrequencyDiscretizer.java,v 1.12 2006/04/14 11:42:27 ingomierswa Exp $
Author:
Sebastian Land

Constructor Summary
FrequencyDiscretizer(OperatorDescription description)
           
 
Method Summary
 IOObject[] apply()
          Implement this method in subclasses.
 java.lang.Class[] getInputClasses()
          Returns the classes that are needed as input.
 java.lang.Class[] getOutputClasses()
          Returns the classes that are guaranteed to be returned by apply() as additional output.
 java.util.List<ParameterType> getParameterTypes()
          Returns a list of ParameterTypes describing the parameters of this operator.
 
Methods inherited from class edu.udo.cs.yale.operator.Operator
addError, addValue, addWarning, apply, checkDeprecations, checkIO, checkProperties, clearErrorList, cloneOperator, createExperimentTree, createExperimentTree, createFromXML, createMarkedExperimentTree, delete, experimentFinished, experimentStarts, getAddOnlyAdditionalOutput, getApplyCount, getDeliveredOutputClasses, getDeprecationInfo, getDesiredInputClasses, getErrorList, getExperiment, getInnerOperatorsXML, getInput, getInput, getInput, getInputDescription, getIOContainerForInApplyLoopBreakpoint, getName, getNumberOfSteps, getOperatorClassName, getOperatorDescription, getParameter, getParameterAsBoolean, getParameterAsColor, getParameterAsDouble, getParameterAsFile, getParameterAsInt, getParameterAsString, getParameterList, getParameters, getParameterType, getParent, getStartTime, getStatus, getUserDescription, getValue, getValues, getXML, hasBreakpoint, hasBreakpoint, hasInput, inApplyLoop, isEnabled, isParameterSet, logMessage, performAdditionalChecks, register, remove, rename, resume, setBreakpoint, setEnabled, setExperiment, setInput, setListParameter, setOperatorParameters, setParameter, setParameters, setParent, setUserDescription, toString, writeXML
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

FrequencyDiscretizer

public FrequencyDiscretizer(OperatorDescription description)
Method Detail

getInputClasses

public java.lang.Class[] getInputClasses()
Description copied from class: Operator
Returns the classes that are needed as input. May be null or an empty (no desired input). As default, all delivered input objects are consumed and must be also delivered as output in both Operator.getOutputClasses() and Operator.apply() if this is necessary. This default behavior can be changed by overriding Operator.getInputDescription(Class). Subclasses which implement this method should not make use of parameters since this method is invoked by getParameterTypes(). Therefore, parameters are not fully available at this point of time and this might lead to exceptions. Please use InputDescriptions instead.

Specified by:
getInputClasses in class Operator


getOutputClasses

public java.lang.Class[] getOutputClasses()
Description copied from class: Operator
Returns the classes that are guaranteed to be returned by apply() as additional output. Please note that input object which should not be consumed must also be defined by this method (e.g. for preprocessing operators). The default behavior for input consumation is defined by Operator.getInputDescription(Class) and can be changed by overwriting this method. Objects which are not consumed must not be defined as additional output in this method. May be null or an empy array (no additional output is produced).

Specified by:
getOutputClasses in class Operator


apply

public IOObject[] apply()
                 throws OperatorException
Description copied from class: Operator
Implement this method in subclasses.

Specified by:
apply in class Operator
Throws:
OperatorException


getParameterTypes

public java.util.List<ParameterType> getParameterTypes()
Description copied from class: Operator
Returns a list of ParameterTypes describing the parameters of this operator. The default implementation returns an empty list if no input objects can be retained and special parameters for those input objects which can be prevented from being consumed.

Overrides:
getParameterTypes in class Operator



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