/**
 \defgroup ITKGPUFiniteDifference Module ITKGPUFiniteDifference 
 This module contains the GPU implementations of base classes
needed for finite difference image filters.  Most of the classes in this module
are abstract and therefore are not intended to be instantiated by themselves. 
 \par Dependencies:
 \li \ref ITKCommon 
 \li \ref ITKFiniteDifference 
 \li \ref ITKGPUCommon 
 \dot 
 graph "ITKGPUFiniteDifference" { 
 "ITKGPUFiniteDifference" -- "ITKCommon"; 
 "ITKGPUFiniteDifference" -- "ITKFiniteDifference"; 
 "ITKGPUFiniteDifference" -- "ITKGPUCommon"; 
 } 
 \enddot 
 */