org.grouplens.lenskit.knn.item

Class WeightedAverageNeighborhoodScorer

java.lang.Object

org.grouplens.lenskit.knn.item.WeightedAverageNeighborhoodScorer

All Implemented Interfaces:

Serializable, NeighborhoodScorer

@Shareable
public class WeightedAverageNeighborhoodScorer
extends Object
implements NeighborhoodScorer, Serializable

Neighborhood scorer that computes the weighted average of neighbor scores.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static Symbol	NEIGHBORHOOD_WEIGHT_SYMBOL

Constructor Summary

Constructors

Constructor and Description
WeightedAverageNeighborhoodScorer()

Method Summary

Modifier and Type	Method and Description
ScoredId	score(long item, SparseVector neighbors, SparseVector scores) Compute a score based on similar neighbors and their corresponding scores.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

NEIGHBORHOOD_WEIGHT_SYMBOL

public static final Symbol NEIGHBORHOOD_WEIGHT_SYMBOL

Constructor Detail

WeightedAverageNeighborhoodScorer

public WeightedAverageNeighborhoodScorer()

Method Detail

score

public ScoredId score(long item,
                      SparseVector neighbors,
                      SparseVector scores)

Description copied from interface: NeighborhoodScorer

Compute a score based on similar neighbors and their corresponding scores.

Specified by:

score in interface NeighborhoodScorer

neighbors - A vector of neighbors with similarity measures.

scores - A vector of item scores. It should contain a score for every item in neighbors.

Returns:

An accumulated score from the neighbors, or null if no score could be computed.

toString

public String toString()

Overrides:

toString in class Object