[Insight-users] LevenbergMarquardt Optimizer

[Miller, James V (Research)]

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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