/usr/include/ITK-4.5/itkSymmetricSigmoidTransferFunction.hxx is in libinsighttoolkit4-dev 4.5.0-3.
This file is owned by root:root, with mode 0o644.
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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 __itkSymmetricSigmoidTransferFunction_hxx
#define __itkSymmetricSigmoidTransferFunction_hxx
#include "itkSymmetricSigmoidTransferFunction.h"
namespace itk
{
namespace Statistics
{
template<typename ScalarType>
SymmetricSigmoidTransferFunction<ScalarType>
::SymmetricSigmoidTransferFunction()
{
m_Range = 15.0;
m_Offset = 0.1;
}
template<typename ScalarType>
SymmetricSigmoidTransferFunction<ScalarType>
::~SymmetricSigmoidTransferFunction()
{
}
template<typename ScalarType>
ScalarType
SymmetricSigmoidTransferFunction<ScalarType>
::Evaluate(const ScalarType& input) const
{
ScalarType val;
if(input<-m_Range)
{
val=-0.5;
}
else if(input>m_Range)
{
val=0.5;
}
else
{
val= (ScalarType)1.0/(1.0+vcl_exp(-input))-0.5;
}
return val;
}
/** Evaluate derivatives */
template<typename ScalarType>
ScalarType
SymmetricSigmoidTransferFunction<ScalarType>
::EvaluateDerivative(const ScalarType& input) const
{
ScalarType f = Evaluate(input);
return (m_Offset+(0.25-f*f));
}
/** Print the object */
template<typename ScalarType>
void
SymmetricSigmoidTransferFunction<ScalarType>
::PrintSelf( std::ostream& os, Indent indent ) const
{
os << indent << "SumInputFunction(" << this << ")" << std::endl;
os << indent << "m_Range = " << m_Range << std::endl;
os << indent << "m_Offset = " << m_Offset << std::endl;
Superclass::PrintSelf( os, indent );
}
} // end namespace Statistics
} // end namespace itk
#endif
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