org.lenskit.knn.item

Class ItemItemScoreAccumulator

java.lang.Object

org.lenskit.knn.item.ItemItemScoreAccumulator

public abstract class ItemItemScoreAccumulator
extends java.lang.Object

Score accumulator for item-item recommendation. It is used to record the results of the item-item CF scoring of one or more items.

Accumulating results here allows us to avoid memory allocations when detailed results are not required.

Method Summary

Modifier and Type	Method and Description
abstract void	add(long item, double score, int nnbrs, double weight) Add a score to the accumulator.
abstract void	applyReversedTransform(InvertibleFunction<Long2DoubleMap,Long2DoubleMap> transform) Apply the reverse of a transform to the results.

Methods inherited from class java.lang.Object

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

Method Detail

add

public abstract void add(long item,
                         double score,
                         int nnbrs,
                         double weight)

Add a score to the accumulator.

Parameters:

item - The item to score.

score - The score.

nnbrs - The number of neighbors used.

weight - The total neighbor weight.

applyReversedTransform

public abstract void applyReversedTransform(InvertibleFunction<Long2DoubleMap,Long2DoubleMap> transform)

Apply the reverse of a transform to the results.

Parameters:

transform - The transform to apply.