1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkLogSigmoidTransferFunction.txx
Language: C++
Date: $Date$
Version: $Revision$
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 __itkLogSigmoidTransferFunction_txx
#define __itkLogSigmoidTransferFunction_txx
#include "itkLogSigmoidTransferFunction.h"
namespace itk
{
namespace Statistics
{
/** Constructor */
template<class ScalarType>
LogSigmoidTransferFunction<ScalarType>
::LogSigmoidTransferFunction()
{
}
/** Destructor */
template<class ScalarType>
LogSigmoidTransferFunction<ScalarType>
::~LogSigmoidTransferFunction()
{
}
/** Evaluate */
template<class ScalarType>
ScalarType
LogSigmoidTransferFunction<ScalarType>
::Evaluate(const ScalarType& input) const
{
const ScalarType v = 1.0 / (1.0 + vcl_exp(-input));
return v;
}
/** Evaluate derivatives */
template<class ScalarType>
ScalarType
LogSigmoidTransferFunction<ScalarType>
::EvaluateDerivative(const ScalarType& input) const
{
ScalarType f = Evaluate(input);
return f * (1 - f);
}
/** Print the object */
template<class ScalarType>
void
LogSigmoidTransferFunction<ScalarType>
::PrintSelf( std::ostream& os, Indent indent ) const
{
os << indent << "LogSigmoidTransferFunction(" << this << ")" << std::endl;
Superclass::PrintSelf( os, indent );
}
} // end namespace Statistics
} // end namespace itk
#endif
|
