es.uam.eps.ir.ranksys.fast.feature

Interface FastFeatureData<I,F,V>

Type Parameters:

I - type of the items

F - type of the features

V - type of the information about item-feature pairs

All Superinterfaces:

FastFeatureIndex<F>, FastItemIndex<I>, FeatureData<I,F,V>, FeatureIndex<F>, ItemIndex<I>

All Known Implementing Classes:

AbstractFastFeatureData, SimpleFastFeatureData

public interface FastFeatureData<I,F,V>
extends FeatureData<I,F,V>, FastItemIndex<I>, FastFeatureIndex<F>

Fast version of FeatureData, where item-feature relationships are stored internally by the indexes provided by FastItemIndex and FastFeatureIndex.

Author:

Saúl Vargas (saul.vargas@uam.es)

Method Summary

Modifier and Type	Method and Description
Stream<Tuple2io<V>>	getFidxItems(int fidx) Returns the items having a feature.
IntStream	getFidxWithItems() Returns the features that are associated with items.
Stream<Tuple2io<V>>	getIidxFeatures(int iidx) Returns the features associated with an item.
IntStream	getIidxWithFeatures() Returns the indexes of the items with features.
int	numFeatures(int iidx) Returns the number of features associated with an item.
int	numItems(int fidx) Returns the number of items having a feature.

Methods inherited from interface es.uam.eps.ir.ranksys.core.feature.FeatureData

getFeatureItems, getFeaturesWithItems, getItemFeatures, getItemsWithFeatures, numFeatures, numFeaturesWithItems, numItems, numItemsWithFeatures

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

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

Methods inherited from interface es.uam.eps.ir.ranksys.core.index.ItemIndex

numItems

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

containsFeature, feature2fidx, feature2fidx, feature2fidx, fidx2feature, fidx2feature, fidx2feature, getAllFeatures, getAllFidx

Methods inherited from interface es.uam.eps.ir.ranksys.core.index.FeatureIndex

numFeatures

Method Detail

getIidxFeatures

Stream<Tuple2io<V>> getIidxFeatures(int iidx)

Returns the features associated with an item.

Parameters:

iidx - item index

Returns:

features associated with the item

getFidxItems

Stream<Tuple2io<V>> getFidxItems(int fidx)

Returns the items having a feature.

Parameters:

fidx - feature index

Returns:

items having the feature

numItems

int numItems(int fidx)

Returns the number of items having a feature.

Parameters:

fidx - feature index

Returns:

number of items having the feature

numFeatures

int numFeatures(int iidx)

Returns the number of features associated with an item.

Parameters:

iidx - item index

Returns:

number of features associated with the item

getIidxWithFeatures

IntStream getIidxWithFeatures()

Returns the indexes of the items with features.

Returns:

a stream of indexes of items with features

getFidxWithItems

IntStream getFidxWithItems()

Returns the features that are associated with items.

Returns:

a stream of indexes of features with items