org.apache.mahout.cf.taste.example.grouplens

Class GroupLensRecommender

java.lang.Object

org.apache.mahout.cf.taste.example.grouplens.GroupLensRecommender

All Implemented Interfaces:

Refreshable, Recommender

public final class GroupLensRecommender
extends Object
implements Recommender

A simple Recommender implemented for the GroupLens demo.

Constructor Summary

Constructors

Constructor and Description
GroupLensRecommender()
GroupLensRecommender(DataModel dataModel) Alternate constructor that takes a DataModel argument, which allows this Recommender to be used with the RecommenderEvaluator framework.

Method Summary

Methods

Modifier and Type	Method and Description
float	estimatePreference(long userID, long itemID)
DataModel	getDataModel()
List<RecommendedItem>	recommend(long userID, int howMany)
List<RecommendedItem>	recommend(long userID, int howMany, IDRescorer rescorer)
void	refresh(Collection<Refreshable> alreadyRefreshed)
void	removePreference(long userID, long itemID)
void	setPreference(long userID, long itemID, float value)
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

GroupLensRecommender

public GroupLensRecommender()
                     throws IOException,
                            TasteException

Throws:

IOException

TasteException

GroupLensRecommender

public GroupLensRecommender(DataModel dataModel)
                     throws TasteException

Alternate constructor that takes a DataModel argument, which allows this Recommender to be used with the RecommenderEvaluator framework.

Parameters:

dataModel - data model

Throws:

TasteException - if an error occurs while initializing this

Method Detail

recommend

public List<RecommendedItem> recommend(long userID,
                              int howMany)
                                throws TasteException

Specified by:

recommend in interface Recommender

Throws:

TasteException

recommend

public List<RecommendedItem> recommend(long userID,
                              int howMany,
                              IDRescorer rescorer)
                                throws TasteException

Specified by:

recommend in interface Recommender

Throws:

TasteException

estimatePreference

public float estimatePreference(long userID,
                       long itemID)
                         throws TasteException

Specified by:

estimatePreference in interface Recommender

Throws:

TasteException

setPreference

public void setPreference(long userID,
                 long itemID,
                 float value)
                   throws TasteException

Specified by:

setPreference in interface Recommender

Throws:

TasteException

removePreference

public void removePreference(long userID,
                    long itemID)
                      throws TasteException

Specified by:

removePreference in interface Recommender

Throws:

TasteException

getDataModel

public DataModel getDataModel()

Specified by:

getDataModel in interface Recommender

refresh

public void refresh(Collection<Refreshable> alreadyRefreshed)

Specified by:

refresh in interface Refreshable

toString

public String toString()

Overrides:

toString in class Object