edu.udo.cs.yale.operator.features.construction
Class FeatureGenerationOperator

java.lang.Object
  extended by edu.udo.cs.yale.operator.Operator
      extended by edu.udo.cs.yale.operator.features.construction.FeatureGenerationOperator
All Implemented Interfaces:
ConfigurationListener

public class FeatureGenerationOperator
extends Operator

This operator generates new user specified features. The new features are specified by their function names (prefix notation) and their arguments using the names of existing features.
Legal function names include +, -, *, /, norm, sin, cos, tan, atan, exp, log, min, max, floor, ceil, round, sqrt, abs, and pow. Constant values can be defined by "const[value]()" where value is the desired value. Do not forget the empty round brackets. Example: +(a1, *(a2, a3)) will calculate the sum of the attribute a1 and the product of the attributes a2 and a3.
Features are generated in the following order

  1. Features specified by the file referenced by the parameter "filename" are generated
  2. Features specified by the parameter list "functions" are generated
  3. If "keep_all" is false, all of the old attributes are removed now

Version:
$Id: FeatureGenerationOperator.java,v 1.12 2006/04/05 08:57:27 ingomierswa Exp $
Author:
Simon Fischer, Ingo Mierswa
See Also:
FeatureGenerator

Field Summary
private static java.lang.Class[] INPUT_CLASSES
           
private static java.lang.Class[] OUTPUT_CLASSES
           
 
Constructor Summary
FeatureGenerationOperator(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
 

Field Detail

INPUT_CLASSES

private static final java.lang.Class[] INPUT_CLASSES

OUTPUT_CLASSES

private static final java.lang.Class[] OUTPUT_CLASSES
Constructor Detail

FeatureGenerationOperator

public FeatureGenerationOperator(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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