es.upm.etsisi.cf4j.recommender.knn.itemSimilarityMetric

Class AdjustedCosine

java.lang.Object

es.upm.etsisi.cf4j.recommender.knn.itemSimilarityMetric.ItemSimilarityMetric

es.upm.etsisi.cf4j.recommender.knn.itemSimilarityMetric.AdjustedCosine

All Implemented Interfaces:

Partible<Item>

public class AdjustedCosine
extends ItemSimilarityMetric

Implements traditional Adjusted Cosine as CF similarity metric for the items.

Field Summary

Fields inherited from class es.upm.etsisi.cf4j.recommender.knn.itemSimilarityMetric.ItemSimilarityMetric

datamodel, similarities

Constructor Summary

Constructors

Constructor and Description
AdjustedCosine()

Method Summary

Modifier and Type	Method and Description
double	similarity(Item item, Item otherItem) This method must returns the similarity between two items.

Methods inherited from class es.upm.etsisi.cf4j.recommender.knn.itemSimilarityMetric.ItemSimilarityMetric

afterRun, beforeRun, getSimilarities, run, setDatamodel, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

AdjustedCosine

public AdjustedCosine()

Method Detail

similarity

public double similarity(Item item,
                         Item otherItem)

Description copied from class: ItemSimilarityMetric

This method must returns the similarity between two items.

If two items do not have a similarity value, the method must return Double.NEGATIVE_INFINITY.

The value returned by this method should be higher the greater the similarity between items.

Specified by:

similarity in class ItemSimilarityMetric

Parameters:

item - An item

otherItem - Other item

Returns:

Similarity between item and otherItem