UncenteredCosineSimilarity Class

NReco.Recommender Class Library

An implementation of the cosine similarity. The result is the cosine of the angle formed between the two preference vectors.

Inheritance Hierarchy

System Object
  NReco.CF.Taste.Impl.Similarity AbstractItemSimilarity
    NReco.CF.Taste.Impl.Similarity AbstractSimilarity
      NReco.CF.Taste.Impl.Similarity UncenteredCosineSimilarity

Namespace: NReco.CF.Taste.Impl.Similarity
Assembly: NReco.Recommender (in NReco.Recommender.dll) Version: 1.0.0.0 (1.0.0.0)

Syntax

C++

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public sealed class UncenteredCosineSimilarity : AbstractSimilarity

public sealed class UncenteredCosineSimilarity : AbstractSimilarity

Public NotInheritable Class UncenteredCosineSimilarity 
	Inherits AbstractSimilarity

Public NotInheritable Class UncenteredCosineSimilarity 
	Inherits AbstractSimilarity

public ref class UncenteredCosineSimilarity sealed : public AbstractSimilarity

public ref class UncenteredCosineSimilarity sealed : public AbstractSimilarity

[<SealedAttribute>]
type UncenteredCosineSimilarity =  
    class 
        inherit AbstractSimilarity 
    end

[<SealedAttribute>]
type UncenteredCosineSimilarity =  
    class 
        inherit AbstractSimilarity 
    end

The UncenteredCosineSimilarity type exposes the following members.

Constructors

	Name	Description
	UncenteredCosineSimilarity(IDataModel)	Initializes a new instance of the UncenteredCosineSimilarity class
	UncenteredCosineSimilarity(IDataModel, Weighting)	Initializes a new instance of the UncenteredCosineSimilarity class

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Methods

	Name	Description
	AllSimilarItemIDs	(Inherited from AbstractItemSimilarity.)
	Equals	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	ItemSimilarities	(Inherited from AbstractSimilarity.)
	ItemSimilarity	(Inherited from AbstractSimilarity.)
	Refresh	(Inherited from AbstractSimilarity.)
	SetPreferenceInferrer	(Inherited from AbstractSimilarity.)
	ToString	(Inherited from AbstractSimilarity.)
	UserSimilarity	(Inherited from AbstractSimilarity.)

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Remarks

Note that this similarity does not "center" its data, shifts the user's preference values so that each of their means is 0. For this behavior, use {@link PearsonCorrelationSimilarity}, which actually is mathematically equivalent for centered data.