[Insight-users] LevenbergMarquardt Optimizer

[Luis Ibanez]

Mark, Jim,


Yes, this request was made some time ago and
was floating on the TODO list...


I'm right now adding the access following in
part Mark's suggestion:


1) The following methods have been added to

    Insight/Code/Numerics/itkMultipleValuedVnlCostFunctionAdaptor


   void UseGradient(bool);
   void UseGradientOn()  { this->UseGradient( true  ); };
   void UseGradientOff() { this->UseGradient( false ); };


2) And access to the functionality is granted from


   Insight/Code/Numerics/itkMultipleValuedNonLinearVnlOptimizer

by the methods:

    void UseCostFunctionGradient(bool);
    void UseCostFunctionGradientOn()  {
              this->UseCostFunctionGradient( true  ); };
    void UseCostFunctionGradientOff() {
              this->UseCostFunctionGradient( false ); };



I'm running a couple of tests before checking this in.


   Luis



=================================================================

Miller, James V (Research) wrote:

> I believe this has been discussed and I thought that some was going
> to allow access to the LevenbergMarquardt routine without having a
> gradient function. 
> 
> Luis, Do you remember who was going to added this capability?
> 
> 
>>-----Original Message-----
>>From: Mark Hastenteufel [mailto:M.Hastenteufel@dkfz-heidelberg.de]
>>Sent: Friday, September 20, 2002 9:50 AM
>>To: ITK Users
>>Subject: [Insight-users] LevenbergMarquardt Optimizer
>>
>>
>>Hello!
>>
>>I'm wondering about the usage of the LevenbergMarquardt algorithm for
>>optimization of multiple valued costfunctions. One have to implement a
>>gradient function, even though it is possible from vnl library to use
>>LevenebergMarquardt without implementing the gradient function.
>>Therefore one have to set
>>vnl_least_squares_function::UseGradient=no_gradient. But one have no
>>access to vnl_least_squares_function and
>>itkMultipleValuedVnlCostFunctionAdaptor, respectivly. The appropriate
>>method GetCostFunctionAdaptor (void) in
>>itkMultipleValuedNonLinearVnlOptimizer is declared protected. I think
>>this should be a public method or there should be a method like
>>itkMultipleValuedNonLinearVnlOptimizer->UseGradient() and
>>itkMultipleValuedNonLinearVnlOptimizer->UseNoGradient().
>>
>>Any comments about that? Thanks in advance,
>>
>>
>>Mark
>>
>> 
>>-- 
>>Mark Hastenteufel
>>Deutsches Krebsforschungszentrum         (German Cancer 
>>Research Center)
>>Div. Medical and Biological Informatics H0100    Tel: (+49) 
>>6221-42 2353
>>Im Neuenheimer Feld 280                          Fax: (+49) 
>>6221-42 2345
>>D-69120 Heidelberg              e-mail            
>>M.Hastenteufel@DKFZ.de
>>Germany                         
>>
> http://www.dkfz.de/mbi/people/markh.html
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