es.upm.etsisi.cf4j.recommender.knn.userSimilarityMetric

Class Cosine

java.lang.Object

es.upm.etsisi.cf4j.recommender.knn.userSimilarityMetric.UserSimilarityMetric

es.upm.etsisi.cf4j.recommender.knn.userSimilarityMetric.Cosine

All Implemented Interfaces:

Partible<User>

public class Cosine
extends UserSimilarityMetric

Implements traditional Cosine as CF similarity metric.

Field Summary

Fields inherited from class es.upm.etsisi.cf4j.recommender.knn.userSimilarityMetric.UserSimilarityMetric

datamodel, similarities

Constructor Summary

Constructors

Constructor and Description
Cosine()

Method Summary

Modifier and Type	Method and Description
double	similarity(User user, User otherUser) This method must returns the similarity between two users.

Methods inherited from class es.upm.etsisi.cf4j.recommender.knn.userSimilarityMetric.UserSimilarityMetric

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

Cosine

public Cosine()

Method Detail

similarity

public double similarity(User user,
                         User otherUser)

Description copied from class: UserSimilarityMetric

This method must returns the similarity between two users.

If two users 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 users.

Specified by:

similarity in class UserSimilarityMetric

Parameters:

user - A user

otherUser - Other user

Returns:

Similarity between user and otherUser