[Insight-users] Re: LevenbergMarquardt Optimizer & Derivatives

[Mark Hastenteufel]

Mark Hastenteufel schrieb:

Hi Luis

I've found the modifications. I'm sorry about that,

 Mark



Mark Hastenteufel schrieb:
> >
> > Hi Luis,
> >
> > thanks for your quick modifications. Did you checked in the new Code?
> > I've just checked out the toolkit but the I could not found your
> > modifications.
> >
> > Mark
> >
> > Luis Ibanez schrieb:
> > >
> > > Hi Mark,
> > >
> > > The modifications to the LevenbergMarquardt
> > > optimizer that you suggested have been made.
> > >
> > > Here is a summary of the changes:
> > >
> > > 1) In  itkMultipleValuedVnlCostFunctionAdaptor
> > >
> > >    the following methods were added:
> > >
> > >    void SetUseGradient(bool);
> > >    void UseGradientOn();
> > >    void UseGradientOff();
> > >    bool GetUseGradient();
> > >
> > >    They map to the use_gradient member variable
> > >    of the vnl_least_squares_function class
> > >
> > > 2) In the itkLevenbergMarquardtOptimizer
> > >
> > >     the following methods were added:
> > >
> > >    void SetUseCostFunctionGradient(bool);
> > >    void UseCostFunctionGradientOn();
> > >    void UseCostFunctionGradientOff();
> > >    bool GetUseCostFunctionGradient();
> > >
> > >   These methods provide access to the methods
> > >   listed in (1) on the VnlAdaptor.
> > >
> > > The usage is illustrated in the file:
> > >
> > > Insight/Testing/Code/Numerics/itkLevenbergMarquardOptimizerTest.cxx
> > >
> > > basically:
> > >
> > >    Optimizer->SetCostFunction( costFunction.GetPointer() );
> > >
> > >    and the use of the gradient can be enabled by any of
> > >    the following calls:
> > >
> > >    costFunction->SetUseGradient( true );
> > >
> > >    Optimizer->SetUseCostFunctionGradient( useGradient );
> > >
> > > The last one requires the CostFuction to be already
> > > plugged into the optimizer.
> > >
> > > Please let us know if you find any problem
> > > with the current implementation.
> > >
> > >    Thanks
> > >
> > >     Luis
> >
> > --
> > 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
> 
> --
> 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

-- 
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