/**
 \defgroup ITKGPUPDEDeformableRegistration Module ITKGPUPDEDeformableRegistration 
 This module contains the GPU implementation of classes
for deformable image registration based on intensity differences by solving
the PDE, optical flow problem.  This includes Thirion's popular "demons"
algorithm. 
 \par Dependencies:
 \li \ref ITKCommon 
 \li \ref ITKGPUCommon 
 \li \ref ITKGPUFiniteDifference 
 \li \ref ITKGPURegistrationCommon 
 \li \ref ITKPDEDeformableRegistration 
 \dot 
 graph "ITKGPUPDEDeformableRegistration" { 
 "ITKGPUPDEDeformableRegistration" -- "ITKCommon"; 
 "ITKGPUPDEDeformableRegistration" -- "ITKGPUCommon"; 
 "ITKGPUPDEDeformableRegistration" -- "ITKGPUFiniteDifference"; 
 "ITKGPUPDEDeformableRegistration" -- "ITKGPURegistrationCommon"; 
 "ITKGPUPDEDeformableRegistration" -- "ITKPDEDeformableRegistration"; 
 } 
 \enddot 
 */