Package org.apache.commons.text.similarity

Class CosineSimilarity

java.lang.Object

org.apache.commons.text.similarity.CosineSimilarity

public class CosineSimilarity
extends Object

Measures the Cosine similarity of two vectors of an inner product space and compares the angle between them.

For further explanation about the Cosine Similarity, refer to http://en.wikipedia.org/wiki/Cosine_similarity.

Since:

1.0

Constructor Summary

Constructors

Constructor	Description
CosineSimilarity()

Method Summary

Modifier and Type	Method	Description
Double	cosineSimilarity(Map<CharSequence,Integer> leftVector, Map<CharSequence,Integer> rightVector)	Calculates the cosine similarity for two given vectors.

Methods inherited from class java.lang.Object

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

Constructor Detail

CosineSimilarity

public CosineSimilarity()

Method Detail

cosineSimilarity

public Double cosineSimilarity(Map<CharSequence,Integer> leftVector,
                               Map<CharSequence,Integer> rightVector)

Calculates the cosine similarity for two given vectors.

Parameters:

leftVector - left vector

rightVector - right vector

Returns:

cosine similarity between the two vectors