[Insight-developers] single valued cost function

[Luis Ibanez]

Also,
be afraid of any code published in ACM Journals.

We are still trying to get rid of some code that
made it in years ago....


    Luis


------------------------------------------------------------
On Thu, Jul 15, 2010 at 5:45 PM, Daniel Blezek <Blezek.Daniel at mayo.edu>wrote:

> Shame that OPT++ is LGPL, would be a nice addition to ITK...
>
>
> On 7/15/10 2:51 PM, "Ziv Yaniv" <zivy at isis.imac.georgetown.edu> wrote:
>
> > Karthik,
> >
> > You are obviously correct. Either the optimizer hierarchy should reflect
> > this, or the type of the cost function passed to optimizers that require
> > derivatives should be changed to the proposed
> > SingleValuedCostFunctionWithDerivative.
> >
> > I believe the only itk optimizer that doesn't require a derivative is
> > the Amoeba optimizer?
> >
> > In any case, a nice design of an optimization hierarchy is described in:
> >
> > J. C. Meza, R. A. Oliva, P. D. Hough, and P. J. Williams, "OPT++: An
> > Object Oriented Toolkit for Nonlinear Optimization",  ACM Transactions
> > on Mathematical Software, Volume 33, Number 2, June 2007.
> >
> > The toolkit's site is https://software.sandia.gov/opt++/index.html
> >
> >                         Ziv
> >
> >
> > On 7/15/2010 2:52 PM, Karthik Krishnan wrote:
> >> On Fri, Jul 16, 2010 at 12:02 AM, Ziv Yaniv
> >> <zivy at isis.imac.georgetown.edu <mailto:zivy at isis.imac.georgetown.edu>>
> >> wrote:
> >>
> >>     What was the reasoning behind having the GetValueAndDerivative and
> >>     the pure virtual GetDerivative method in the
> >>     SingleValuedCostFunction class? This does not accommodate non
> >>     differentiable functions in a natural way.
> >>
> >>     I see two options:
> >>
> >>     Slight modification of the current cost function hierarchy,
> >>     1. Remove both methods from the SingleValuedCostFunction class.
> >>     2. Add a class SingleValuedCostFunctionWithDerivative adding the two
> >>     methods and inheriting from SingleValuedCostFunction
> >>     3. Modify the inheritance of the direct subclasses (7 according to
> >>     doxygen) from the old class to the new one.
> >>
> >>
> >> Don't you also need to to include a similar additional hierarchy in the
> >> optimizers, since the hierarchy of cost functions should be matched by
> >> the space of optimizers.
> >>
> >> There are only two kinds of cost functions : (a) single valued
> >> multivariate (b) Multivalued multivariate cost functions. Likewise there
> >> are two kinds of optimizers as well.
> >>
> >> thx
> >> --
> >> karthik
> >>
> >>
> >>     No change to code base,
> >>     1. Implementation of GetDerivative in a subclass that cannot compute
> >>     one just throws an excpetion. Ugly but guaranteed to get the
> >>     developers attention.
> >>
> >>     Am I missing something? If not, I would be happy if itk-v4 adopts
> >>     the first option.
> >>
> >>                        Ziv
> >>
> >>
> >>     --
> >>     Ziv Yaniv, PhD., Research Assistant Professor
> >>     Imaging Science and Information Systems (ISIS) Center
> >>     Department of Radiology
> >>     Georgetown University Medical Center
> >>     2115 Wisconsin Avenue, Suite 603
> >>     Washington, DC, 20007,
> >>
> >>     Phone: +1-202-687-7286
> >>     Fax: +1-202-784-3479
> >>     email: zivy at isis.georgetown.edu <mailto:zivy at isis.georgetown.edu>
> >>     web: http://isiswiki.georgetown.edu/zivy/
> >>     _______________________________________________
> >>     Powered by www.kitware.com <http://www.kitware.com>
> >>
> >>     Visit other Kitware open-source projects at
> >>     http://www.kitware.com/opensource/opensource.html
> >>
> >>     Kitware offers ITK Training Courses, for more information visit:
> >>     http://kitware.com/products/protraining.html
> >>
> >>     Please keep messages on-topic and check the ITK FAQ at:
> >>     http://www.itk.org/Wiki/ITK_FAQ
> >>
> >>     Follow this link to subscribe/unsubscribe:
> >>     http://www.itk.org/mailman/listinfo/insight-developers
> >>
> >>
> >
>
> --
> Daniel Blezek, PhD
> Medical Imaging Informatics Innovation Center
>
> P 127 or (77) 8 8886
> T 507 538 8886
> E blezek.daniel at mayo.edu
>
> Mayo Clinic
> 200 First St. S.W.
> Harwick SL-44
> Rochester, MN 55905
> mayoclinic.org
> ³It is more complicated than you think.² -- RCF 1925
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Kitware offers ITK Training Courses, for more information visit:
> http://kitware.com/products/protraining.html
>
> Please keep messages on-topic and check the ITK FAQ at:
> http://www.itk.org/Wiki/ITK_FAQ
>
> Follow this link to subscribe/unsubscribe:
> http://www.itk.org/mailman/listinfo/insight-developers
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.itk.org/mailman/private/insight-developers/attachments/20100719/ec42fa09/attachment.htm>