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/*=========================================================================
Program: ORFEO Toolbox
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Centre National d'Etudes Spatiales. All rights reserved.
See OTBCopyright.txt for details.
Copyright (c) Institut Telecom; Telecom bretagne. All rights reserved.
See IMTCopyright.txt 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 otbSOMLearningBehaviorFunctor_h
#define otbSOMLearningBehaviorFunctor_h
namespace otb
{
namespace Functor
{
/** \class SOMLearningBehaviorFunctor
* \brief Classical Beta behavior over SOM training phase
*
* This class implements an standard evolution of the \f$ \beta \f$ weightening
* coefficient over the SOM training.
*
* \f[
\beta = \beta_0 + \left( \beta_{\textrm{end}} - \beta_0 \right)
\frac{t}{t_{\textrm{end}}}
\f]
*
* \sa SOM
*
* \ingroup OTBSOM
*/
class SOMLearningBehaviorFunctor
{
public:
/** Empty constructor / descructor */
SOMLearningBehaviorFunctor () {}
virtual ~SOMLearningBehaviorFunctor() {}
/** Functor */
virtual double operator ()(unsigned int currentIteration,
unsigned int numberOfIterations,
double betaInit, double betaEnd) const
{
return betaInit + (betaEnd - betaInit)
* static_cast<double>(currentIteration)
/ static_cast<double>(numberOfIterations);
}
}; // end of class SOMLearningBehaviorFunctor
} // end namespace Functor
} // end namespace otb
#endif
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