Levenberg |
Levenberg-Marquardt minimizer that does not allocate memory during iterations and uses wrapped parameters
for handling bounds.
Inheritance HierarchySystemObject
Altaxo.Calc.OptimizationNonlinearMinimizerBaseNonAllocating
Altaxo.Calc.OptimizationLevenbergMarquardtMinimizerNonAllocatingWrappedParameters
Altaxo.Calc.OptimizationNonlinearMinimizerBaseNonAllocating
Altaxo.Calc.OptimizationLevenbergMarquardtMinimizerNonAllocatingWrappedParameters
Namespace: Altaxo.Calc.Optimization
Assembly: AltaxoCore (in AltaxoCore.dll) Version: 4.8.3448.0 (4.8.3448.0)
SyntaxC#
public class LevenbergMarquardtMinimizerNonAllocatingWrappedParameters : NonlinearMinimizerBaseNonAllocating
The LevenbergMarquardtMinimizerNonAllocatingWrappedParameters type exposes the following members.
Constructors| Name | Description | |
|---|---|---|
 | LevenbergMarquardtMinimizerNonAllocatingWrappedParameters | Initializes a new instance of the LevenbergMarquardtMinimizerNonAllocatingWrappedParameters class |
Properties| Name | Description | |
|---|---|---|
 | FunctionTolerance |
Gets or sets the stopping threshold for the function value or L2 norm of the residuals.
(Inherited from NonlinearMinimizerBaseNonAllocating) |
| GradientTolerance |
Gets or sets the stopping threshold for the infinity norm of the gradient.
(Inherited from NonlinearMinimizerBaseNonAllocating) |
| InitialMu | Gets or sets the scale factor for the initial mu. |
 | IsBounded |
Gets a value indicating whether bounded optimization is active (bounds and/or scales are configured).
(Inherited from NonlinearMinimizerBaseNonAllocating) |
| LowerBound |
Gets the lower bound of the parameters.
(Inherited from NonlinearMinimizerBaseNonAllocating) |
| MaximumIterations |
Gets or sets the maximum number of iterations. If , the maximum number of iterations is determined automatically.
(Inherited from NonlinearMinimizerBaseNonAllocating) |
| MinimalRSSImprovement |
Gets or sets the minimal RSS improvement.
(Inherited from NonlinearMinimizerBaseNonAllocating) |
| ParameterScaleUpdatePeriod | Gets or sets the number of iterations after which the parameter scale is updated (if no user-provided scale was set). The default value is 1, which means the parameter scale is updated in each iteration. Set the value to MaxValue if no scale update is necessary. |
| Scales |
Gets the scale factors for the parameters.
(Inherited from NonlinearMinimizerBaseNonAllocating) |
| StepTolerance |
Gets or sets the stopping threshold for the L2 norm of the change of the parameters.
(Inherited from NonlinearMinimizerBaseNonAllocating) |
| UpperBound |
Gets the upper bound of the parameters.
(Inherited from NonlinearMinimizerBaseNonAllocating) |
Methods| Name | Description | |
|---|---|---|
| Equals | Determines whether the specified object is equal to the current object. (Inherited from Object) |
 | EvaluateFunction |
Evaluates the objective function at the provided internal parameter values.
(Inherited from NonlinearMinimizerBaseNonAllocating) |
| EvaluateJacobian |
Evaluates the Jacobian-derived gradient and the Hessian of the objective function.
(Inherited from NonlinearMinimizerBaseNonAllocating) |
| Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object) |
| FindMinimum(IObjectiveModelNonAllocating, IReadOnlyListDouble, CancellationToken, ActionInt32, Double, IReadOnlyListDouble) | Non-linear least squares fitting by the Levenberg-Marquardt algorithm. |
| FindMinimum(IObjectiveModelNonAllocating, IReadOnlyListDouble, IReadOnlyListNullableDouble, IReadOnlyListNullableDouble, IReadOnlyListDouble, IReadOnlyListBoolean, CancellationToken, ActionInt32, Double, IReadOnlyListDouble) | Non-linear least squares fitting by the Levenberg-Marquardt algorithm. |
| FindMinimum(IObjectiveModelNonAllocating, Double, NullableDouble, NullableDouble, Double, Boolean, CancellationToken, ActionInt32, Double, IReadOnlyListDouble) | Non-linear least squares fitting by the Levenberg-Marquardt algorithm. |
| GetHashCode | Serves as the default hash function. (Inherited from Object) |
| GetType | Gets the Type of the current instance. (Inherited from Object) |
| MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object) |
| Minimum | Non-linear least squares fitting by the Levenberg-Marquardt algorithm. |
| ProjectToExternalParameters |
Projects internal to external parameters.
(Inherited from NonlinearMinimizerBaseNonAllocating) |
| ProjectToInternalParameters |
Projects external to internal parameters.
(Inherited from NonlinearMinimizerBaseNonAllocating) |
| ScaleFactorsOfJacobian |
Calculates the scale factor of the Jacobian, taking into account the parameter transformations and the parameter scales.
(Inherited from NonlinearMinimizerBaseNonAllocating) |
| ToString | Returns a string that represents the current object. (Inherited from Object) |
| ValidateBounds |
Validates and stores parameter bounds and scale factors.
(Inherited from NonlinearMinimizerBaseNonAllocating) |
Fields| Name | Description | |
|---|---|---|
  | DefaultInitialMu | The default scale factor for the initial mu. |
RemarksReferences:
[1]. Madsen, K., H. B. Nielsen, and O. Tingleff, "Methods for Non-Linear Least Squares Problems. Technical University of Denmark, 2004. Lecture notes." (2004), Available online from: http://orbit.dtu.dk/files/2721358/imm3215.pdf
[2]. Gavin, Henri, "The Levenberg-Marquardt method for nonlinear least squares curve-fitting problems." Department of Civil and Environmental Engineering, Duke University (2017): 1-19, Available online from: http://people.duke.edu/~hpgavin/ce281/lm.pdf
See Also