org.lenskit.slopeone

Class SlopeOneModelDataAccumulator

java.lang.Object

org.lenskit.slopeone.SlopeOneModelDataAccumulator

public class SlopeOneModelDataAccumulator
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
SlopeOneModelDataAccumulator(double damping, LongSet items) Creates an accumulator to process rating data and generate the necessary data for a SlopeOneItemScorer.

Method Summary

Modifier and Type	Method and Description
KeyedObjectMap<org.lenskit.slopeone.SlopeOneModel.ModelRow>	buildMatrix()
void	putItemPair(long id1, Long2DoubleSortedMap itemVec1, long id2, Long2DoubleSortedMap itemVec2) Puts the item pair into the accumulator.

Methods inherited from class java.lang.Object

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

Constructor Detail

SlopeOneModelDataAccumulator

public SlopeOneModelDataAccumulator(double damping,
                                    LongSet items)

Creates an accumulator to process rating data and generate the necessary data for a SlopeOneItemScorer.

Parameters:

damping - A damping term for deviation calculations.

items - The set of known item IDs.

Method Detail

putItemPair

public void putItemPair(long id1,
                        Long2DoubleSortedMap itemVec1,
                        long id2,
                        Long2DoubleSortedMap itemVec2)

Puts the item pair into the accumulator.

Parameters:

id1 - The id of the first item.

itemVec1 - The rating vector of the first item.

id2 - The id of the second item.

itemVec2 - The rating vector of the second item.

buildMatrix

public KeyedObjectMap<org.lenskit.slopeone.SlopeOneModel.ModelRow> buildMatrix()

Returns:

A matrix of item deviation and corating values to be used by a SlopeOneItemScorer.