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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef itkLearningFunctionBase_h
#define itkLearningFunctionBase_h
#include "itkLightProcessObject.h"
namespace itk
{
namespace Statistics
{
/** \class LearningFunctionBase
* \brief The LearningFunctionBase is the base class for all the learning strategies.
*
* These include error back propagation, bp+momentum, conjugte gradient descent, quick prop.
*
* This class specifies how the errors are backpropagated for a layer. They take a LayerBase
* object as input and compute the input for the layers input weightset.
*
* \ingroup ITKNeuralNetworks
*/
template<typename LayerType, typename TTargetVector>
class LearningFunctionBase : public LightProcessObject
{
public:
typedef LearningFunctionBase Self;
typedef LightProcessObject Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Method for creation through the object factory. */
itkTypeMacro(LearningFunctionBase, LightProcessObject);
typedef typename LayerType::ValueType ValueType;
virtual void Learn(LayerType* layer, ValueType) = 0;
virtual void Learn(LayerType* layer, TTargetVector error,ValueType) = 0;
protected:
LearningFunctionBase() {};
~LearningFunctionBase() ITK_OVERRIDE {};
/** Method to print the object. */
virtual void PrintSelf( std::ostream& os, Indent indent ) const ITK_OVERRIDE
{
Superclass::PrintSelf( os, indent );
os << indent << "LearningFunctionBase(" << this << ")" << std::endl;
}
};
} // end namespace Statistics
} // end namespace itk
#endif
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