ROperator_Elu.hxx

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#ifndef TMVA_SOFIE_ROPERATOR_Elu
#define TMVA_SOFIE_ROPERATOR_Elu
 
#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_Elu final : public ROperator {
 
private:
   /* Attributes*/
   float falpha = 1.0; // default value
   std::string fNX;
   std::string fNY;
   std::vector<size_t> fShape;
   std::string fType;
 
public:
   ROperator_Elu() {}
   ROperator_Elu(float alpha, std::string nameX, std::string nameY)
      : falpha(alpha), fNX(UTILITY::Clean_name(nameX)), fNY(UTILITY::Clean_name(nameY))
   {
      fInputTensorNames = {fNX};
      fOutputTensorNames = {fNY};
 
      if (std::is_same<T, float>::value) {
         fType = "float";
      } else {
         throw std::runtime_error("TMVA SOFIE Encountered unsupported type parsing a Elu operator");
      }
   }
 
   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 Elu Op Input Tensor is not found in model");
      }
      fShape = model.GetTensorShape(fNX);
      model.AddIntermediateTensor(fNY, model.GetTensorType(fNX), fShape);
   }
 
   std::string Generate(std::string OpName) override
   {
      OpName = "op_" + OpName;
      if (fShape.empty()) {
         throw std::runtime_error("TMVA SOFIE Operator Elu called to Generate without being initialized first");
      }
      std::stringstream out;
      size_t length = ConvertShapeToLength(fShape);
 
      out << SP << "float " << OpName << "_alpha = " << std::setprecision(std::numeric_limits<float>::max_digits10)
          << falpha << ";\n";
 
      out << "\n//------ ELU \n";
      out << SP << "for (int id = 0; id < " << length << " ; id++){\n";
      out << SP << SP << "tensor_" << fNY << "[id] = ((tensor_" << fNX << "[id] >= 0 )? tensor_" << fNX
          << "[id] : " << OpName << "_alpha * (std::exp(tensor_" << fNX << "[id]) - 1));\n";
      out << SP << "}\n";
      return out.str();
   }
};
 
} // namespace SOFIE
} // namespace Experimental
} // namespace TMVA
 
#endif // TMVA_SOFIE_ROPERATOR_Elu