ROperator_HardSwish.hxx

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#ifndef TMVA_SOFIE_ROPERATOR_HARDSWISH
#define TMVA_SOFIE_ROPERATOR_HARDSWISH
 
#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_HardSwish final : public ROperator
{
 
private:
 
   std::string fNX;
   std::string fNY;
   std::vector<size_t> fShape;
 
public:
   ROperator_HardSwish(){}
   ROperator_HardSwish(std::string nameX, std::string nameY):
      fNX(UTILITY::Clean_name(nameX)), fNY(UTILITY::Clean_name(nameY)){
         fInputTensorNames = { fNX };
         fOutputTensorNames = { fNY };
      }
 
   void Initialize(RModel& model) override {
      //input must be a graph input, or already initialized intermediate tensor.
      if (model.CheckIfTensorAlreadyExist(fNX) == false){
         throw std::runtime_error("TMVA SOFIE HardSwish Op Input Tensor " + fNX + " 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 HardSwish operator called to Generate without being initialized first");
      }
      std::stringstream out;
      size_t length = ConvertShapeToLength(fShape);
 
      out << "\n//------ HardSwish\n";
      out << SP << "for (int id = 0; id < " << length << " ; id++){\n";
      out << SP << SP << "float h = 0x1.5555555555555p-3f * tensor_" << fNX << "[id] + 0x1p-1f;\n";
      out << SP << SP << "tensor_" << fNY << "[id] = tensor_" << fNX
          << "[id] * std::fmax(0x0p+0f, std::fmin(0x1p+0f, h));\n";
      out << SP << "}\n";
      return out.str();
   }
 
   std::vector<std::string> GetStdLibs() override { return { std::string("cmath") };}
};
 
}//SOFIE
}//Experimental
}//TMVA
 
 
#endif //TMVA_SOFIE_ROPERATOR_HARDSWISH