Warning with LBFGSB: does not support scaling

Beginner Questions
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1

Here is a very simple example of an image registration:

import SimpleITK as sitk

x = sitk.Image(50, 50, sitk.sitkFloat32)
x[10:40,10:40] = 1
y = sitk.Image(50, 50, sitk.sitkFloat32)
y[15:45,15:45] = 1

sitk.ProcessObject.SetGlobalWarningDisplay(True)

R = sitk.ImageRegistrationMethod()
R.SetInitialTransform(sitk.TranslationTransform(2))
R.SetMetricAsMeanSquares()
R.SetOptimizerAsLBFGSB()

print(R.Execute(x,y))

Unfortunately, it prints all the time this warning:

WARNING: In /tmp/SimpleITK-build/ITK/Modules/Numerics/Optimizersv4/src/itkLBFGSBOptimizerv4.cxx, line 99
LBFGSBOptimizerv4 (0x557d34e68130): LBFGSB optimizer does not support scaling. All scales are set to one.

I wondered why I get this, because I never set any scales myself.
I think I followed the code correctly and this is where the SetScales member is called: SimpleITK/sitkImageRegistrationMethod.cxx at cd7cd20bb1f5ed846ec5d4686a1e1997822521e2 · SimpleITK/SimpleITK · GitHub

However, it should not even be called because when I run R.GetOptimizerScales() it returns () and I can not see how it is set otherwise.
Thus, I wonder why I see this warning? Is there anything I can do to get rid of it?
Of course, I can turn off warnings, but that would also mean I might miss other warnings…

2

Could you please create a issue about this warning on SimpleITK’s Github Issue tracker?

You can write a custom logger to filter warnings. Here is an example of adopting an ITK logger to be used with the Python logging module which should give some idea on how warnings could be filtered.

Adding missing example link: Logging — SimpleITK 2.0rc2 documentation

3

I created an issue!

You mean this example code here: SimpleITK: Logging/Logging.py ?
That looks good, I’ll look into that, thanks!

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