com.rapidminer.operator.performance
Class MinMaxCriterion

java.lang.Object
  com.rapidminer.operator.AbstractIOObject
      com.rapidminer.operator.ResultObjectAdapter
          com.rapidminer.tools.math.Averagable
              com.rapidminer.operator.performance.PerformanceCriterion
                  com.rapidminer.operator.performance.MeasuredPerformance
                      com.rapidminer.operator.performance.MinMaxCriterion

All Implemented Interfaces:

IOObject, ResultObject, Saveable, Readable, Reportable, LoggingHandler, java.io.Serializable, java.lang.Cloneable, java.lang.Comparable<PerformanceCriterion>

public class MinMaxCriterion
extends MeasuredPerformance

This criterion should be used as wrapper around other performance criteria (see MinMaxWrapper). Instead of averages this criterion builds the minimum of the fitness of the criteria which should be averaged. Maximizing the minimum instead of the average could lead to a more robust behaviour and generalization capacity. Furthermore, this criterion can be build arbitrarily weighted linear combinations of both the minimum and the normal average.

Author:

Ingo Mierswa

See Also:

Serialized Form

Constructor Summary

MinMaxCriterion()
Necessary for newInstance() during loading.

MinMaxCriterion(MeasuredPerformance delegate, double weight)

MinMaxCriterion(MinMaxCriterion mmc)

Method Summary

void	buildSingleAverage(Averagable avg) This method should build the average of this and another averagable of the same type.
void	countExample(Example example) Counts a single example by invoking the delegates method.
java.lang.String	getDescription() Returns a description of the performance criterion.
double	getExampleCount() Returns the number of data points which was used to determine the criterion value.
double	getFitness() Returns the fitness depending on the value.
double	getMikroAverage() Returns the (current) value of the averagable (the average itself).
double	getMikroVariance() Returns the variance of the averagable.
java.lang.String	getName() Returns the name of this averagable.

Methods inherited from class com.rapidminer.operator.performance.MeasuredPerformance

startCounting, startCounting

Methods inherited from class com.rapidminer.operator.performance.PerformanceCriterion

compareTo, getMaxFitness

Methods inherited from class com.rapidminer.tools.math.Averagable

buildAverage, clone, cloneAveragable, formatPercent, getAverage, getAverageCount, getExtension, getFileDescription, getMakroAverage, getMakroStandardDeviation, getMakroVariance, getMikroStandardDeviation, getStandardDeviation, getVariance, getVisualizationComponent, setAverageCount, toString

Methods inherited from class com.rapidminer.operator.ResultObjectAdapter

addAction, getActions, getResultIcon, isSavable, log, logError, logNote, logWarning, save, toHTML, toResultString

Methods inherited from class com.rapidminer.operator.AbstractIOObject

copy, getLog, getSource, initWriting, read, setLoggingHandler, setSource, write

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.rapidminer.operator.IOObject

copy, getLog, getSource, setLoggingHandler, setSource, write

Constructor Detail

MinMaxCriterion

public MinMaxCriterion()

Necessary for newInstance() during loading.

MinMaxCriterion

public MinMaxCriterion(MeasuredPerformance delegate,
                       double weight)

MinMaxCriterion

public MinMaxCriterion(MinMaxCriterion mmc)

Method Detail

getExampleCount

public double getExampleCount()

Description copied from class: PerformanceCriterion

Returns the number of data points which was used to determine the criterion value. If the criterion does not use example weights (or no weight was given) then the returned value will be an integer. Otherwise, the returned value is the sum of all example weights.

Specified by:

getExampleCount in class PerformanceCriterion

countExample

public void countExample(Example example)

Counts a single example by invoking the delegates method.

Specified by:

countExample in class MeasuredPerformance

getDescription

public java.lang.String getDescription()

Returns a description of the performance criterion.

Specified by:

getDescription in class PerformanceCriterion

getName

public java.lang.String getName()

Description copied from class: Averagable

Returns the name of this averagable. The returned string should only contain lowercase letters and underscore (RapidMiner parameter format) since the names will be automatically used for GUI purposes.

Specified by:

getName in interface ResultObject

Specified by:

getName in class Averagable

getMikroAverage

public double getMikroAverage()

Description copied from class: Averagable

Returns the (current) value of the averagable (the average itself). If the method Averagable.buildSingleAverage(Averagable) was used, this method must return the micro average from both (or more) criteria. This is usually achieved by correctly implementing Averagable.buildSingleAverage(Averagable).

Specified by:

getMikroAverage in class Averagable

getFitness

public double getFitness()

Description copied from class: PerformanceCriterion

Returns the fitness depending on the value. The fitness values will be used for all optimization purposes (feature space transformations, parameter optimizations...) and must always be maximized. Hence, if your criterion is better the smaller the value is you should return something like (-1 * value) or (1 / value).

Subclasses should use Averagable.getAverage() instead of Averagable.getMikroAverage() in this method since usually the makro average (if available) should be optmized instead of the mikro average. The mikro average should only be used in the (rare) cases where no makro average is available but this is automatically done returned by Averagable.getAverage() in these cases.

Specified by:

getFitness in class PerformanceCriterion

getMikroVariance

public double getMikroVariance()

Description copied from class: Averagable

Returns the variance of the averagable. The returned value must not be negative. If the averagable does not define a variance this method should return Double.NaN.

Specified by:

getMikroVariance in class Averagable

buildSingleAverage

public void buildSingleAverage(Averagable avg)

Description copied from class: Averagable

This method should build the average of this and another averagable of the same type. The next invocation of Averagable.getMikroAverage() should return the average of this and the given averagable. Hence, this method is used to build the actual micro average value of two criteria. Please refer to SimpleCriterion for a simple implementation example.

Specified by:

buildSingleAverage in class Averagable