org.apache.mahout.cf.taste.impl.similarity
Class AbstractItemSimilarity
java.lang.Object
org.apache.mahout.cf.taste.impl.similarity.AbstractItemSimilarity
- All Implemented Interfaces:
- Refreshable, ItemSimilarity
- Direct Known Subclasses:
- CityBlockSimilarity, EuclideanDistanceSimilarity, LogLikelihoodSimilarity, PearsonCorrelationSimilarity, TanimotoCoefficientSimilarity, UncenteredCosineSimilarity
public abstract class AbstractItemSimilarity
- extends Object
- implements ItemSimilarity
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
AbstractItemSimilarity
protected AbstractItemSimilarity(DataModel dataModel)
getDataModel
protected DataModel getDataModel()
allSimilarItemIDs
public long[] allSimilarItemIDs(long itemID)
throws TasteException
- Specified by:
allSimilarItemIDs
in interface ItemSimilarity
- Returns:
- all IDs of similar items, in no particular order
- Throws:
TasteException
refresh
public void refresh(Collection<Refreshable> alreadyRefreshed)
- Description copied from interface:
Refreshable
Triggers "refresh" -- whatever that means -- of the implementation. The general contract is that any
Refreshable
should always leave itself in a consistent, operational state, and that the refresh
atomically updates internal state from old to new.
- Specified by:
refresh
in interface Refreshable
- Parameters:
alreadyRefreshed
- Refreshable
s that are known to have already been
refreshed as a result of an initial call to a Refreshable.refresh(Collection)
method on some
object. This ensure that objects in a refresh dependency graph aren't refreshed twice
needlessly.
Copyright © 2008–2014 The Apache Software Foundation. All rights reserved.