ROperator_Sigmoid.hxx

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#ifndef TMVA_SOFIE_ROPERATOR_Sigmoid
#define TMVA_SOFIE_ROPERATOR_Sigmoid
 
#include "TMVA/SOFIE_common.hxx"
#include "TMVA/ROperator.hxx"
#include "TMVA/RModel.hxx"
 
#include <sstream>
 
namespace TMVA{
namespace Experimental{
namespace SOFIE{
 
template <typename T>
class ROperator_Sigmoid final : public ROperator
{
 
private:
 
   std::string fNX;
   std::string fNY;
   std::vector<Dim> fShape;
 
public:
   ROperator_Sigmoid(){}
   ROperator_Sigmoid(std::string nameX, std::string nameY):
      fNX(UTILITY::Clean_name(nameX)), fNY(UTILITY::Clean_name(nameY)){
         fInputTensorNames = { fNX };
         fOutputTensorNames = { fNY };
      }
 
   std::vector<ETensorType> TypeInference(std::vector<ETensorType> input) override {
      return input;
   }
 
   std::vector<std::vector<size_t>> ShapeInference(std::vector<std::vector<size_t>> input) override {
      auto ret = input; //suggest copy to compiler
      return ret;
   }
 
   void Initialize(RModel& model) override {
      if (model.CheckIfTensorAlreadyExist(fNX) == false){   //input must be a graph input, or already initialized intermediate tensor
         throw std::runtime_error("TMVA SOFIE Sigmoid Op Input Tensor is not found in model");
      }
      fShape = model.GetDimTensorShape(fNX);
      model.AddIntermediateTensor(fNY, model.GetTensorType(fNX), fShape);
   }
 
 
   std::string Generate(std::string opName) override {
      if (fShape.empty()){
         throw std::runtime_error("TMVA SOFIE Operator Sigmoid called to Generate without being initialized first");
      }
      std::stringstream out;
      auto length = ConvertDimShapeToLength(fShape);
      out << "\n//------ Sigmoid -- " << opName << "\n";
      out << SP << "for (int id = 0; id < " << length << " ; id++){\n";
      out << SP << SP  << "tensor_" << fNY << "[id] = 1 / (1 + std::exp( - tensor_"  << fNX << "[id]));\n";
      out << SP << "}\n";
      return out.str();
   }
 
   std::vector<std::string> GetStdLibs() override { return { std::string("cmath") };}
};
 
}//SOFIE
}//Experimental
}//TMVA
 
 
#endif //TMVA_SOFIE_ROPERATOR_Sigmoid