/usr/include/root/TMVA/TActivationIdentity.h is in libroot-tmva-dev 5.34.30-0ubuntu8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Author: Matt Jachowski
/**********************************************************************************
* Project: TMVA - a Root-integrated toolkit for multivariate data analysis *
* Package: TMVA *
* Class : TMVA::TActivationIdentity *
* Web : http://tmva.sourceforge.net *
* *
* Description: *
* Identity activation function for TNeuron *
* *
* Authors (alphabetical): *
* Matt Jachowski <jachowski@stanford.edu> - Stanford University, USA *
* *
* Copyright (c) 2005: *
* CERN, Switzerland *
* *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted according to the terms listed in LICENSE *
* (http://tmva.sourceforge.net/LICENSE) *
**********************************************************************************/
#ifndef ROOT_TMVA_TActivationIdentity
#define ROOT_TMVA_TActivationIdentity
//////////////////////////////////////////////////////////////////////////
// //
// TActivationIdentity //
// //
// Identity activation function for TNeuron //
// //
//////////////////////////////////////////////////////////////////////////
#ifndef ROOT_TFormula
#include "TFormula.h"
#endif
#ifndef ROOT_TString
#include "TString.h"
#endif
#ifndef ROOT_TMVA_TActivation
#include "TMVA/TActivation.h"
#endif
namespace TMVA {
class TActivationIdentity : public TActivation {
public:
TActivationIdentity() {}
~TActivationIdentity() {}
// evaluate the activation function
virtual Double_t Eval(Double_t arg) { return arg; } // f(x) = x
// evaluate the derivative of the activation function
virtual Double_t EvalDerivative(Double_t) {
return 1; // f'(x) = 1
}
// minimum of the range of the activation function
virtual Double_t GetMin() { return 0; } // these should never be called
// maximum of the range of the activation function
virtual Double_t GetMax() { return 1; } // these should never be called
// expression for activation function
virtual TString GetExpression() { return "x\t1"; }
// writer of function code
virtual void MakeFunction(std::ostream& fout, const TString& fncName);
private:
ClassDef(TActivationIdentity,0) // Identity activation function for TNeuron
};
} // namespace TMVA
#endif
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