[Insight-users] LBFGSB optimizer number of iterations printout error

[Emma Saunders]

Hi all,

Im printing out values of metric following Bspline registrations, using an
observer connected to the optimizer.

However when  using  boptimizer->SetMaximumNumberOfIterations( 2 );

I actually get 8 values printed out: see below.  The command iteration
update code is also attched.  At first I thought it was because I use
multiple observers during each multiresolution step but also
removeallobservers() between each multi layer step.  Any suggestions
appreciated?


Starting Registration with Medium resolution transform
1.07399e+06
bspline
1.06241e+06
bspline
1.01962e+06
bspline
1.01962e+06
bspline
895448
bspline
895448
bspline
878673
bspline
878673
bspline



//This is for B spline

  class BCommandIterationUpdate : public itk::Command
{
public:
  typedef  BCommandIterationUpdate   Selfb;
  typedef  itk::Command            Superclassb;
  typedef itk::SmartPointer<Selfb>   Pointerb;
  itkNewMacro( Selfb );
protected:
  BCommandIterationUpdate() {};
public:
   typedef itk::LBFGSBOptimizer       bOptimizerType;
  typedef   const bOptimizerType *                  bOptimizerPointer;

  void Execute(itk::Object *caller, const itk::EventObject & event)
    {
    Execute( (const itk::Object *)caller, event);
    }

  void Execute(const itk::Object * object, const itk::EventObject & event)
    {
    bOptimizerPointer boptimizer =
                      dynamic_cast< bOptimizerPointer >( object );
    if( ! itk::IterationEvent().CheckEvent( &event ) )
      {
      return;
      }
     //std::cout << optimizer->GetCurrentIteration() << "   ";
     std::cout << boptimizer->GetValue() << "   " <<std::endl;
     std::cout << "bspline" <<std::endl;
     //std::cout << optimizer->GetCurrentPosition() << std::endl;
    }
};
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