org.apache.mahout.cf.taste.impl.eval

Class AverageAbsoluteDifferenceRecommenderEvaluator

java.lang.Object

org.apache.mahout.cf.taste.impl.eval.AbstractDifferenceRecommenderEvaluator

org.apache.mahout.cf.taste.impl.eval.AverageAbsoluteDifferenceRecommenderEvaluator

All Implemented Interfaces:

RecommenderEvaluator

public final class AverageAbsoluteDifferenceRecommenderEvaluator
extends AbstractDifferenceRecommenderEvaluator

A RecommenderEvaluator which computes the average absolute difference between predicted and actual ratings for users.

This algorithm is also called "mean average error".

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.mahout.cf.taste.impl.eval.AbstractDifferenceRecommenderEvaluator

AbstractDifferenceRecommenderEvaluator.PreferenceEstimateCallable

Constructor Summary

Constructors

Constructor and Description
AverageAbsoluteDifferenceRecommenderEvaluator()

Method Summary

Modifier and Type	Method and Description
protected double	computeFinalEvaluation()
protected void	processOneEstimate(float estimatedPreference, Preference realPref)
protected void	reset()
String	toString()

Methods inherited from class org.apache.mahout.cf.taste.impl.eval.AbstractDifferenceRecommenderEvaluator

evaluate, execute, getMaxPreference, getMinPreference, setMaxPreference, setMinPreference

Methods inherited from class java.lang.Object

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

Constructor Detail

AverageAbsoluteDifferenceRecommenderEvaluator

public AverageAbsoluteDifferenceRecommenderEvaluator()

Method Detail

reset

protected void reset()

Specified by:

reset in class AbstractDifferenceRecommenderEvaluator

processOneEstimate

protected void processOneEstimate(float estimatedPreference,
                                  Preference realPref)

Specified by:

processOneEstimate in class AbstractDifferenceRecommenderEvaluator

computeFinalEvaluation

protected double computeFinalEvaluation()

Specified by:

computeFinalEvaluation in class AbstractDifferenceRecommenderEvaluator

toString

public String toString()

Overrides:

toString in class Object