ENH: added NumberOfIterations component setting and shortened some tests

by using 1 iteration (instead of default 100)

Modules/Components/itkImageRegistrationMethodv4/include/selxItkGradientDescentOptimizerv4.hxx

@@ -61,6 +61,28 @@ ItkGradientDescentOptimizerv4Component< InternalComputationValueType>
       }
     }
   }
+  else if (criterion.first == "NumberOfIterations") //Supports this?
+  {
+    if (criterion.second.size() != 1)
+    {
+      meetsCriteria = false;
+      //itkExceptionMacro("The criterion Sigma may have only 1 value");
+    }
+    else
+    {
+      auto const & criterionValue = *criterion.second.begin();
+      try
+      {
+        this->m_Optimizer->SetNumberOfIterations(std::stoi(criterionValue));
+        meetsCriteria = true;
+      }
+      catch (itk::ExceptionObject & err)
+      {
+        //TODO log the error message?
+        meetsCriteria = false;
+      }
+    }
+  }
   return meetsCriteria;
 }
 

Modules/Components/itkImageRegistrationMethodv4/test/selxRegistrationItkv4Test.cxx

@@ -220,6 +220,7 @@ TEST_F(RegistrationItkv4Test, WithANTSCCMetric)
 
   ParameterMapType component5Parameters;
   component5Parameters["NameOfClass"] = { "ItkGradientDescentOptimizerv4Component" };
+  component5Parameters["NumberOfIterations"] = { "1" };
   blueprint->AddComponent("Optimizer", component5Parameters);
 
   ParameterMapType connection1Parameters;
@@ -303,6 +304,10 @@ TEST_F(RegistrationItkv4Test, WithMeanSquaresMetric)
   component4Parameters["Dimensionality"] = { "3" }; // should be derived from the inputs
   blueprint->AddComponent("Metric", component4Parameters);
 
+  ParameterMapType component5Parameters;
+  component5Parameters["NameOfClass"] = { "ItkGradientDescentOptimizerv4Component" };
+  component5Parameters["NumberOfIterations"] = { "1" };
+  blueprint->AddComponent("Optimizer", component5Parameters);
 
   ParameterMapType connection1Parameters;
   connection1Parameters["NameOfInterface"] = { "itkImageFixedInterface" };
@@ -320,6 +325,10 @@ TEST_F(RegistrationItkv4Test, WithMeanSquaresMetric)
   connection4Parameters["NameOfInterface"] = { "itkMetricv4Interface" };
   blueprint->AddConnection("Metric", "RegistrationMethod", connection4Parameters);
 
+  ParameterMapType connection5Parameters;
+  connection5Parameters["NameOfInterface"] = { "itkOptimizerv4Interface" };
+  blueprint->AddConnection("Optimizer", "RegistrationMethod", connection5Parameters);
+
   // Instantiate SuperElastix
   SuperElastixFilterType::Pointer superElastixFilter;
   EXPECT_NO_THROW(superElastixFilter = SuperElastixFilterType::New());
@@ -392,6 +401,11 @@ TEST_F(RegistrationItkv4Test, DisplacementField)
   component6Parameters["Dimensionality"] = { "3" }; // should be derived from the outputs
   blueprint->AddComponent("TransformDisplacementFilter", component6Parameters);
 
+  ParameterMapType component7Parameters;
+  component7Parameters["NameOfClass"] = { "ItkGradientDescentOptimizerv4Component" };
+  component7Parameters["NumberOfIterations"] = { "1" };
+  blueprint->AddComponent("Optimizer", component7Parameters);
+
   ParameterMapType connection1Parameters;
   connection1Parameters["NameOfInterface"] = { "itkImageFixedInterface" };
   blueprint->AddConnection("FixedImageSource", "RegistrationMethod", connection1Parameters);
@@ -414,6 +428,7 @@ TEST_F(RegistrationItkv4Test, DisplacementField)
 
   blueprint->AddConnection("RegistrationMethod", "TransformDisplacementFilter", { {} });
   blueprint->AddConnection("FixedImageSource", "TransformDisplacementFilter", { {} });
+  blueprint->AddConnection("Optimizer", "RegistrationMethod", { {} });
 
   // Instantiate SuperElastix
   SuperElastixFilterType::Pointer superElastixFilter;