org.apache.mahout.cf.taste.impl.recommender
Class NearestNeighborClusterSimilarity

java.lang.Object
  org.apache.mahout.cf.taste.impl.recommender.NearestNeighborClusterSimilarity

All Implemented Interfaces:

Refreshable, ClusterSimilarity

Deprecated.

@Deprecated
public final class NearestNeighborClusterSimilarity
extends Object
implements ClusterSimilarity

Defines cluster similarity as the largest similarity between any two users in the clusters -- that is, it says that clusters are close when some pair of their members has high similarity.

Constructor Summary

NearestNeighborClusterSimilarity(UserSimilarity similarity)
Deprecated. Constructs a based on the given UserSimilarity.

NearestNeighborClusterSimilarity(UserSimilarity similarity, double samplingRate)
Deprecated. Constructs a based on the given UserSimilarity.

Method Summary

double	getSimilarity(FastIDSet cluster1, FastIDSet cluster2) Deprecated.
void	refresh(Collection<Refreshable> alreadyRefreshed) Deprecated. Triggers "refresh" -- whatever that means -- of the implementation.
String	toString() Deprecated.

Methods inherited from class java.lang.Object

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

Constructor Detail

NearestNeighborClusterSimilarity

public NearestNeighborClusterSimilarity(UserSimilarity similarity)

Deprecated.

Constructs a based on the given UserSimilarity. All user-user similarities are examined.

NearestNeighborClusterSimilarity

public NearestNeighborClusterSimilarity(UserSimilarity similarity,
                                        double samplingRate)

Deprecated.

Constructs a based on the given UserSimilarity. By setting samplingRate to a value less than 1.0, this implementation will only examine that fraction of all user-user similarities between two clusters, increasing performance at the expense of accuracy.

Method Detail

getSimilarity

public double getSimilarity(FastIDSet cluster1,
                            FastIDSet cluster2)
                     throws TasteException

Deprecated.

Specified by:

getSimilarity in interface ClusterSimilarity

Parameters:

cluster1 - first cluster of user IDs

cluster2 - second cluster of user IDs

Returns:

"distance" between clusters; a bigger value means less similarity

Throws:

TasteException - if an error occurs while computing similarity, such as errors accessing an underlying DataModel

refresh

public void refresh(Collection<Refreshable> alreadyRefreshed)

Deprecated.

Description copied from interface: Refreshable

Triggers "refresh" -- whatever that means -- of the implementation. The general contract is that any should always leave itself in a consistent, operational state, and that the refresh atomically updates internal state from old to new.

Specified by:

refresh in interface Refreshable

Parameters:

alreadyRefreshed - s that are known to have already been refreshed as a result of an initial call to a method on some object. This ensure that objects in a refresh dependency graph aren't refreshed twice needlessly.

toString

public String toString()

Deprecated.

Overrides:

toString in class Object