[ITK] [ITK-dev] Regression from change with WindowConvergenceMonitoringFunction?

[Nicholas Tustison]

Oh, sorry about this Brad.   I’m currently on my way out and am still at 
MICCAI but I will look at this tomorrow and see what I can figure out.
Thanks for finding this.

Nick




> On Oct 7, 2015, at 5:39 PM, Bradley Lowekamp <blowekamp at mail.nih.gov> wrote:
> 
> Hello,
> 
> I am upgrading SimpleITK's superbuild to the latest ITK. I have encountered an odd regression..
> 
> Here is the failing test output [1] and here is the source [2], where the check at line 679 fails, because the optimization didn't move.
> 
> What is very odd is that after running a git bisect I found that this patch [3] was the root of the change in behavior:
> 
> commit 51c2ff58e04a25166b6aafc7d7590c2ae74f2ec6
> Author: Nick Tustison <ntustison at gmail.com <mailto:ntustison at gmail.com>>
> Date:   Tue Jun 30 21:29:07 2015 -0700
> 
>     BUG:  Set a default b-spline epsilon.
>     
>     The B-spline domain is defined on the closed-half interval
>     [a,b) which presents difficulty when we define the image
>     domain to be co-extensive with the B-spline domain.  Earlier
>     attempts at calculating the B-spline domain didn't work as
>     this error kept popping up.  Therefore we're defining a
>     default B-spline epsilon which the user can change depending
>     on usage.
>     
>     Change-Id: I64605557fc7131e148c725e0d1cce2e5aa84f31f
> 
> After grepping around I found that the BSplineScatteredDataPointSetToImageFilter is used by the WindowConvergenceMonitoringFunction. Which could cause this early convergence I was seeing.
> 
> Perhaps this changed epsilon default value does not not make sense for the ConvergenceMonitoringFunctions?
> 
> Thanks for the additional eyes and opinions on this!
> 
> Brad
> 
> [1] https://open.cdash.org/testDetails.php?test=380566217&build=4051508 <https://open.cdash.org/testDetails.php?test=380566217&build=4051508>
> [2] https://github.com/SimpleITK/SimpleITK/blob/master/Testing/Unit/sitkImageRegistrationMethodTests.cxx#L627-L683 <https://github.com/SimpleITK/SimpleITK/blob/master/Testing/Unit/sitkImageRegistrationMethodTests.cxx#L627-L683>
> [3] https://github.com/InsightSoftwareConsortium/ITK/commit/51c2ff58e04a25166b6aafc7d7590c2ae74f2ec6 <https://github.com/InsightSoftwareConsortium/ITK/commit/51c2ff58e04a25166b6aafc7d7590c2ae74f2ec6>
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