itkbackpropagationlayer.h

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/*=========================================================================

Program:   Insight Segmentation & Registration Toolkit
Module:    $RCSfile: itkBackPropagationLayer.h,v $
Language:  C++
Date:      $Date: 2007-08-17 13:10:57 $
Version:   $Revision: 1.7 $

Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef __itkBackPropagationLayerBase_h
#define __itkBackPropagationLayerBase_h

#include "itkCompletelyConnectedWeightSet.h"
#include "itkLayerBase.h"
#include "itkObject.h"
#include "itkMacro.h"

namespace itk
{
  namespace Statistics
    {
    template<class TMeasurementVector, class TTargetVector>
      class BackPropagationLayer : public LayerBase<TMeasurementVector, TTargetVector>
        {
      public:
        typedef BackPropagationLayer Self;
        typedef LayerBase<TMeasurementVector, TTargetVector> Superclass;
        typedef SmartPointer<Self> Pointer;
        typedef SmartPointer<const Self> ConstPointer;

        /** Method for creation through the object factory. */
        itkTypeMacro(BackPropagationLayer, LayerBase);
        itkNewMacro(Self);

        typedef typename Superclass::ValueType ValueType;
        typedef vnl_vector<ValueType> NodeVectorType;
        typedef typename Superclass::InternalVectorType InternalVectorType;
        typedef typename Superclass::OutputVectorType OutputVectorType;
        typedef typename Superclass::LayerInterfaceType LayerInterfaceType;
        typedef CompletelyConnectedWeightSet<TMeasurementVector,TTargetVector> WeightSetType;

        typedef typename Superclass::WeightSetInterfaceType WeightSetInterfaceType;
        typedef typename Superclass::InputFunctionInterfaceType InputFunctionInterfaceType;
        typedef typename Superclass::TransferFunctionInterfaceType TransferFunctionInterfaceType;
        //Member Functions
        virtual void SetNumberOfNodes(unsigned int numNodes);
        virtual ValueType GetInputValue(unsigned int i) const;
        virtual void SetInputValue(unsigned int i, ValueType value);

        virtual ValueType GetOutputValue(unsigned int) const;
        virtual void SetOutputValue(unsigned int, ValueType);

        virtual ValueType * GetOutputVector();
        void SetOutputVector(TMeasurementVector value);

        virtual void ForwardPropagate();
        virtual void ForwardPropagate(TMeasurementVector input);

        virtual void BackwardPropagate();
        virtual void BackwardPropagate(InternalVectorType errors);

        virtual void SetOutputErrorValues(TTargetVector);
        virtual ValueType GetOutputErrorValue(unsigned int node_id) const;

        virtual ValueType GetInputErrorValue(unsigned int node_id) const;
        virtual ValueType * GetInputErrorVector();
        virtual void SetInputErrorValue(ValueType, unsigned int node_id);

        virtual ValueType Activation(ValueType);
        virtual ValueType DActivation(ValueType);

        /** Set/Get the bias */
        itkSetMacro( Bias, ValueType );
        itkGetConstReferenceMacro( Bias, ValueType );

      protected:

        BackPropagationLayer();
        virtual ~BackPropagationLayer();

        /** Method to print the object. */
        virtual void PrintSelf( std::ostream& os, Indent indent ) const;

      private:

        NodeVectorType   m_NodeInputValues;
        NodeVectorType   m_NodeOutputValues;
        NodeVectorType   m_InputErrorValues;
        NodeVectorType   m_OutputErrorValues;
        ValueType        m_Bias;
        };

    } // end namespace Statistics
} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkBackPropagationLayer.txx"
#endif

#endif