[Insight-users] Why itk::LBFGSBOptimizer and itk::LBFGSOptimizer are classed as single-variant o

[Ali -]

Brad,

Thanks, this is useful as a future reference.


> Ali - wrote:
> > Thanks for pointing out where the 'implementation problem :)' is
> > located. I'll try to extend the optimiser for a multi0variant version.
> > 
> > Since both ITK and VNL implementation are only wrappers, it should be
> > starightforward to implement this. However, since the access to lbfgs is
> > through VNL, it makes sense to implement both wrappers. The complexity
> > starts where we need to extend some part of VNL: assume at some point
> > VNL developers provide a featue like this, in this case (1) our
> > implementation in VNL is redundant, and (2) the ITK wrapper should point
> > to the official implementation. I am not sure what would be the best
> > policy to choose.
> 
> It looks from the rest of this thread that you may not be doing any
> implementation, but if you do, here is the situation with VNL v. ITK.
> 
> The vnl inside ITK is just a snapshot of upstream vnl with the library
> names changed to have an itk prefix.  Every year or two we update to the
> latest vnl from upstream vxl.  We have close ties to the vxl developers,
> and I have write access to vxl's CVS repository.  I have a CVS watch on
> ITK's vxl directory so that whenever a fix is committed I am notified
> and can port it over to vxl upstream.  Within a few weeks we will
> probably be updating ITK's vnl again.  Now there is a vnl_lbfgsb which
> can be used to remove the lbfgsb.c currently found in ITK and wrapped up
> with LBFGSBOptimizer.
> 
> If you are going to add any features please go get an upstream vxl
> checkout and add it directly to vnl.  You can post a patch to their
> mailing list, or send it to me.  Their project page is
> 
> http://vxl.sourceforge.net/
> 
> After any feature is added to vnl in vxl upstream I can port it over to
> ITK's vnl.
> 
> Thanks,
> -Brad

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