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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 itkLogSigmoidTransferFunction_hxx
#define itkLogSigmoidTransferFunction_hxx
#include "itkLogSigmoidTransferFunction.h"
namespace itk
{
namespace Statistics
{
template<typename TScalar>
LogSigmoidTransferFunction<TScalar>
::LogSigmoidTransferFunction()
{
}
template<typename TScalar>
LogSigmoidTransferFunction<TScalar>
::~LogSigmoidTransferFunction()
{
}
template<typename TScalar>
TScalar
LogSigmoidTransferFunction<TScalar>
::Evaluate(const ScalarType& input) const
{
const ScalarType v = static_cast< ScalarType >( 1.0 /
( 1.0 + std::exp( -1*static_cast< typename NumericTraits< ScalarType >::RealType >(input)) ) );
return v;
}
template<typename TScalar>
TScalar
LogSigmoidTransferFunction<TScalar>
::EvaluateDerivative(const ScalarType& input) const
{
ScalarType f = Evaluate(input);
return f * (1 - f);
}
template<typename TScalar>
void
LogSigmoidTransferFunction<TScalar>
::PrintSelf( std::ostream& os, Indent indent ) const
{
Superclass::PrintSelf( os, indent );
os << indent << "LogSigmoidTransferFunction(" << this << ")" << std::endl;
}
} // end namespace Statistics
} // end namespace itk
#endif
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