Jaccard (CF4J 2.3.0 API Documentation)

java.lang.Object
- es.upm.etsisi.cf4j.recommender.knn.userSimilarityMetric.UserSimilarityMetric
- - es.upm.etsisi.cf4j.recommender.knn.userSimilarityMetric.Jaccard

All Implemented Interfaces:

Partible<User>
```
public class Jaccard
extends UserSimilarityMetric
```
Implements traditional Jaccard Index as CF similarity metric.

Field Summary
- Fields inherited from class es.upm.etsisi.cf4j.recommender.knn.userSimilarityMetric.UserSimilarityMetric
  datamodel, similarities

Constructor Summary

Constructors
Constructor Description

Jaccard()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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
  - Jaccard
```
public Jaccard()
```
- 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