netflix.algorithms.modelbased.itembased.method
Class PearsonSimilarityMethod

java.lang.Object
  netflix.algorithms.modelbased.itembased.method.PearsonSimilarityMethod

All Implemented Interfaces:

SimilarityMethod

public class PearsonSimilarityMethod
extends java.lang.Object
implements SimilarityMethod

Constructor Summary

PearsonSimilarityMethod()

Method Summary

double	findSimilarity(DataReader dataReader, int mid1, int mid2) Finds the similarity between two movies.
double	findUserSimilarity(DataReader dataReader, int uid1, int uid2)
void	setNumMinMovies(int numMinMovies)
void	setNumMinUsers(int numMinUsers) Sets the least number of users needed to call two items similar

Methods inherited from class java.lang.Object

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

Constructor Detail

PearsonSimilarityMethod

public PearsonSimilarityMethod()

Method Detail

findSimilarity

public double findSimilarity(DataReader dataReader,
                             int mid1,
                             int mid2)

Description copied from interface: SimilarityMethod

Finds the similarity between two movies.

Specified by:

findSimilarity in interface SimilarityMethod

Parameters:

dataReader - DataReader object to use to read the data

mid1 - first movie Id

mid2 - second movie Id

Returns:

a double similarity value

setNumMinUsers

public void setNumMinUsers(int numMinUsers)

Description copied from interface: SimilarityMethod

Sets the least number of users needed to call two items similar

Specified by:

setNumMinUsers in interface SimilarityMethod

setNumMinMovies

public void setNumMinMovies(int numMinMovies)

Specified by:

setNumMinMovies in interface SimilarityMethod

Parameters:

numMinMovies -

findUserSimilarity

public double findUserSimilarity(DataReader dataReader,
                                 int uid1,
                                 int uid2)

Specified by:

findUserSimilarity in interface SimilarityMethod

Parameters:

dataReader - - reads from the data on this dataset

uid1 - - one of the users to compare

uid2 - - the other user to compare

Returns:

- the similarity between user 1 and user 2