[ITK] [ITK-users] CommandIterationUpdate optimizer position reporting

[Dženan Zukić]

Hi Andrew,

different optimizers have different behavior (e.g. small steps vs big
steps), but even the programming interface is not uniform. Some functions
are called differently e.g. maximumSteps vs iterationCount etc. You should
look at the respective examples for each optimizer which you plan to use to
see how iteration tracking is set up.

Regards,
Dženan Zukić, PhD, Senior R&D Engineer, Kitware (Carrboro, N.C.)

On Fri, Apr 28, 2017 at 4:10 PM, Andrew Harris <aharr8 at uwo.ca> wrote:

> Hello,
> I'm attempting to track the movement of images under registration using
> various optimizers.  I have a CommandIterationUpdate observer set up to
> write the optimizer positions to file, and when I use a Gradient Descent or
> Powell optimizer I get a vector for the translation applied using
> optimizer->GetCurrentPosition(), however if I use the LBFGSB optimizer I
> get zero vectors all the way down (it returns the correct result though).
> Is the functionality of GetCurrentPosition() different in the LBFGSB
> optimizer than the others?
>
> --
>
> AH
>
>
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