org.apache.mahout.math.hadoop.similarity.vector
Class DistributedUncenteredZeroAssumingCosineVectorSimilarity

java.lang.Object
  extended by org.apache.mahout.math.hadoop.similarity.vector.AbstractDistributedVectorSimilarity
      extended by org.apache.mahout.math.hadoop.similarity.vector.DistributedUncenteredZeroAssumingCosineVectorSimilarity
All Implemented Interfaces:
DistributedVectorSimilarity

public class DistributedUncenteredZeroAssumingCosineVectorSimilarity
extends AbstractDistributedVectorSimilarity

distributed implementation of the cosine similarity of two vectors


Constructor Summary
DistributedUncenteredZeroAssumingCosineVectorSimilarity()
           
 
Method Summary
protected  double doComputeResult(int rowA, int rowB, java.lang.Iterable<Cooccurrence> cooccurrences, double weightOfVectorA, double weightOfVectorB, int numberOfColumns)
          do the actual similarity computation
 double weight(Vector v)
          vectors have no weight (NaN) by default, subclasses may override this
 
Methods inherited from class org.apache.mahout.math.hadoop.similarity.vector.AbstractDistributedVectorSimilarity
countElements, countElements, similarity
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

DistributedUncenteredZeroAssumingCosineVectorSimilarity

public DistributedUncenteredZeroAssumingCosineVectorSimilarity()
Method Detail

doComputeResult

protected double doComputeResult(int rowA,
                                 int rowB,
                                 java.lang.Iterable<Cooccurrence> cooccurrences,
                                 double weightOfVectorA,
                                 double weightOfVectorB,
                                 int numberOfColumns)
Description copied from class: AbstractDistributedVectorSimilarity
do the actual similarity computation

Specified by:
doComputeResult in class AbstractDistributedVectorSimilarity
See Also:
DistributedVectorSimilarity.similarity(int, int, Iterable, double, double, int)

weight

public double weight(Vector v)
Description copied from class: AbstractDistributedVectorSimilarity
vectors have no weight (NaN) by default, subclasses may override this

Specified by:
weight in interface DistributedVectorSimilarity
Overrides:
weight in class AbstractDistributedVectorSimilarity


Copyright © 2008-2010 The Apache Software Foundation. All Rights Reserved.