es.uam.eps.ir.ranksys.nn.item.sim

Class VectorCosineItemSimilarity<I>

java.lang.Object

es.uam.eps.ir.ranksys.nn.item.sim.ItemSimilarity<I>

es.uam.eps.ir.ranksys.nn.item.sim.VectorCosineItemSimilarity<I>

Type Parameters:

I - type of the items

All Implemented Interfaces:

ItemIndex<I>, FastItemIndex<I>, Similarity

public class VectorCosineItemSimilarity<I>
extends ItemSimilarity<I>

Vector cosine item similarity. See VectorCosineSimilarity.

Author:

Saúl Vargas (saul.vargas@uam.es)

Field Summary

Fields inherited from class es.uam.eps.ir.ranksys.nn.item.sim.ItemSimilarity

iIndex, sim

Constructor Summary

Constructors

Constructor and Description
VectorCosineItemSimilarity(FastPreferenceData<?,I> data, double alpha, boolean dense) Constructor.

Method Summary

Methods inherited from class es.uam.eps.ir.ranksys.nn.item.sim.ItemSimilarity

iidx2item, item2iidx, numItems, similarElems, similarItems, similarItems, similarity, similarity, similarity, similarity

Methods inherited from class java.lang.Object

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

Methods inherited from interface es.uam.eps.ir.ranksys.fast.index.FastItemIndex

containsItem, getAllIidx, getAllItems, iidx2item, iidx2item, item2iidx, item2iidx

Constructor Detail

VectorCosineItemSimilarity

public VectorCosineItemSimilarity(FastPreferenceData<?,I> data,
                                  double alpha,
                                  boolean dense)

Constructor.

Parameters:

data - preference

alpha - asymmetry of the similarity, set to 0.5 to standard cosine.

dense - true for array-based calculations, false to map-based