Class CofiCostFunction

Default Collaborative Filtering cost function.

Inheritance
System.Object
CostFunction
CofiCostFunction
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
Namespace:numl.Math.Functions.Cost
Assembly:numl.dll
Syntax
public class CofiCostFunction : CostFunction, ICostFunction

Properties

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CollaborativeFeatures

Gets or sets the number of Collaborative Features.

Declaration
public int CollaborativeFeatures { get; set; }
Property Value
Type Description
System.Int32
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R

Gets or Sets the R matrix where each cell indicates if a reference / rating exists (e.g. 1 or 0).

Declaration
public Matrix R { get; set; }
Property Value
Type Description
Matrix

Methods

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ComputeCost(Vector)

Compute the error cost of the given Theta parameter for the training and label sets

Declaration
public override double ComputeCost(Vector theta)
Parameters
Type Name Description
Vector theta

Learning Theta parameters
Returns
Type Description
System.Double
Overrides
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ComputeGradient(Vector)

Compute the error cost of the given Theta parameter for the training and label sets

Declaration
public override Vector ComputeGradient(Vector theta)
Parameters
Type Name Description
Vector theta

Learning Theta parameters
Returns
Type Description
Vector
Overrides
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Initialize()

Initialization method for performing custom actions prior to being optimized.

Declaration
public override void Initialize()
Overrides