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NMFAlsUpdate Class

Class NMFAlsUpdate encapsulates the Alternating Least Squares (ALS) update algorithm.
Inheritance Hierarchy

Namespace: CenterSpace.NMath.Core
Assembly: NMath (in NMath.dll) Version: 7.4
public class NMFAlsUpdate : INMFUpdateAlgorithm, 

The NMFAlsUpdate type exposes the following members.

Public methodNMFAlsUpdate Constructs an NMFAlsUpdate instance.
Public methodClone Creates a deep copy of this NMFAlsUpdate.
Public methodCost Returns the value of the cost function for the non-negative factorization of V = WH. The cost function is minimized by the factorization.
Public methodInitialFactors Provides the initial factors for the iteration process that computes W and H in the non-negative matrix factorization V = WH.
Public methodIterationStep Updates the factors W and H in the non-negative matrix factorization V = WH.
The Alternating Least Squares (ALS) update algorithm takes advantage of the fact that while the optimization problem is not simultaneously convex in W and H, it is convex in either W or H. Thus, given one matrix, the other can be found with a simple least squares computation.
See Also