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itkBackPropagationLayer.h

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00001 /*=========================================================================
00002 
00003 Program:   Insight Segmentation & Registration Toolkit
00004 Module:    $RCSfile: itkBackPropagationLayer.h,v $
00005 Language:  C++
00006 Date:      $Date: 2009-01-24 21:33:49 $
00007 Version:   $Revision: 1.8 $
00008 
00009 Copyright (c) Insight Software Consortium. All rights reserved.
00010 See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
00011 
00012 This software is distributed WITHOUT ANY WARRANTY; without even
00013 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
00014 PURPOSE.  See the above copyright notices for more information.
00015 
00016 =========================================================================*/
00017 #ifndef __itkBackPropagationLayer_h
00018 #define __itkBackPropagationLayer_h
00019 
00020 #include "itkCompletelyConnectedWeightSet.h"
00021 #include "itkLayerBase.h"
00022 #include "itkObject.h"
00023 #include "itkMacro.h"
00024 
00025 namespace itk
00026 {
00027 namespace Statistics
00028 {
00029 template<class TMeasurementVector, class TTargetVector>
00030 class BackPropagationLayer : public LayerBase<TMeasurementVector, TTargetVector>
00031 {
00032 public:
00033   typedef BackPropagationLayer                         Self;
00034   typedef LayerBase<TMeasurementVector, TTargetVector> Superclass;
00035   typedef SmartPointer<Self>                           Pointer;
00036   typedef SmartPointer<const Self>                     ConstPointer;
00037 
00039   itkTypeMacro(BackPropagationLayer, LayerBase);
00040   itkNewMacro(Self);
00042 
00043   typedef typename Superclass::ValueType              ValueType;
00044   typedef vnl_vector<ValueType>                       NodeVectorType;
00045   typedef typename Superclass::InternalVectorType     InternalVectorType;
00046   typedef typename Superclass::OutputVectorType       OutputVectorType;
00047   typedef typename Superclass::LayerInterfaceType     LayerInterfaceType;
00048   typedef CompletelyConnectedWeightSet<TMeasurementVector,TTargetVector>
00049                                                       WeightSetType;
00050 
00051   typedef typename Superclass::WeightSetInterfaceType WeightSetInterfaceType;
00052   typedef typename Superclass::InputFunctionInterfaceType
00053                                                       InputFunctionInterfaceType;
00054   typedef typename Superclass::TransferFunctionInterfaceType
00055                                                       TransferFunctionInterfaceType;
00056   //Member Functions
00057   virtual void SetNumberOfNodes(unsigned int numNodes);
00058   virtual ValueType GetInputValue(unsigned int i) const;
00059   virtual void SetInputValue(unsigned int i, ValueType value);
00060   
00061   virtual ValueType GetOutputValue(unsigned int) const;
00062   virtual void SetOutputValue(unsigned int, ValueType);
00063 
00064   virtual ValueType * GetOutputVector();
00065   void SetOutputVector(TMeasurementVector value);
00066 
00067   virtual void ForwardPropagate();
00068   virtual void ForwardPropagate(TMeasurementVector input);
00069   
00070   virtual void BackwardPropagate();
00071   virtual void BackwardPropagate(InternalVectorType errors);
00072   
00073   virtual void SetOutputErrorValues(TTargetVector);
00074   virtual ValueType GetOutputErrorValue(unsigned int node_id) const;
00075 
00076   virtual ValueType GetInputErrorValue(unsigned int node_id) const;
00077   virtual ValueType * GetInputErrorVector();
00078   virtual void SetInputErrorValue(ValueType, unsigned int node_id);
00079   
00080   virtual ValueType Activation(ValueType);
00081   virtual ValueType DActivation(ValueType);
00082 
00084   itkSetMacro( Bias, ValueType );
00085   itkGetConstReferenceMacro( Bias, ValueType );
00087 
00088 protected:
00089   
00090   BackPropagationLayer();
00091   virtual ~BackPropagationLayer();
00092   
00094   virtual void PrintSelf( std::ostream& os, Indent indent ) const;
00095 
00096 private:
00097   
00098   NodeVectorType   m_NodeInputValues;
00099   NodeVectorType   m_NodeOutputValues;
00100   NodeVectorType   m_InputErrorValues;
00101   NodeVectorType   m_OutputErrorValues;
00102   ValueType        m_Bias;
00103 };
00104 
00105 } // end namespace Statistics
00106 } // end namespace itk
00107 
00108 #ifndef ITK_MANUAL_INSTANTIATION
00109 #include "itkBackPropagationLayer.txx"
00110 #endif
00111 
00112 #endif
00113 

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