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TActivationReLU.cxx
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1 // @(#)root/tmva $Id$
2 // Author: Helge Voss
3 
4 /**********************************************************************************
5  * Project: TMVA - a Root-integrated toolkit for multivariate data analysis *
6  * Package: TMVA *
7  * Class : TActivationReLU *
8  * Web : http://tmva.sourceforge.net *
9  * *
10  * Description: *
11  * Rectified linear unit function for an ANN. *
12  * *
13  * Authors (alphabetical): *
14  * Helge Voss *
15  * *
16  * Copyright (c) 2005: *
17  * CERN, Switzerland *
18  * *
19  * Redistribution and use in source and binary forms, with or without *
20  * modification, are permitted according to the terms listed in LICENSE *
21  * (http://tmva.sourceforge.net/LICENSE) *
22  **********************************************************************************/
23 
24 /*! \class TMVA::TActivationReLU
25 \ingroup TMVA
26 Rectified Linear Unit activation function for TNeuron
27 */
28 
29 #include "TMVA/TActivationReLU.h"
30 
31 #include "TMVA/TActivation.h"
32 
33 #include "TString.h"
34 
35 #include <iostream>
36 
38 
39 ////////////////////////////////////////////////////////////////////////////////
40 /// get expressions for the tanh and its derivative
41 
43 {
44  TString expr = "max(0,x)";
45 
46  return expr;
47 }
48 
49 ////////////////////////////////////////////////////////////////////////////////
50 /// writes the Rectified Linear Unit activation function source code
51 
52 void TMVA::TActivationReLU::MakeFunction( std::ostream& fout, const TString& fncName )
53 {
54  fout << "double " << fncName << "(double x) const {" << std::endl;
55  fout << " // rectified linear unit" << std::endl;
56  fout << " return x>0 ? x : 0; " << std::endl;
57  fout << "}" << std::endl;
58 }
ClassImp
#define ClassImp(name)
Definition: Rtypes.h:364
TActivationReLU.h
TMVA::TActivationReLU
Rectified Linear Unit activation function for TNeuron.
Definition: TActivationReLU.h:41
TString
Basic string class.
Definition: TString.h:136
TString.h
TActivation.h
TMVA::TActivationReLU::GetExpression
TString GetExpression()
get expressions for the tanh and its derivative
Definition: TActivationReLU.cxx:42
TMVA::TActivationReLU::MakeFunction
virtual void MakeFunction(std::ostream &fout, const TString &fncName)
writes the Rectified Linear Unit activation function source code
Definition: TActivationReLU.cxx:52