ExpSigmoidConverter.cpp

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#include <cmath>
#include <iostream>
 
#include <ElementsKernel/Logging.h>
 
#include "ModelFitting/Parameters/ExpSigmoidConverter.h"
 
namespace ModelFitting {
 
using namespace std;
 
static Elements::Logging logger = Elements::Logging::getLogger("ModelFitting");
 
ExpSigmoidConverter::~ExpSigmoidConverter() = default;
 
double ExpSigmoidConverter::worldToEngine(const double world_value) const {
  if (world_value < m_min_value || world_value > m_max_value) {
    logger.warn() << "WorldToEngine ExpSigmoidConverter: world values outside of possible range";
  }
 
  auto wv = std::max(m_min_value, std::min(m_max_value, world_value));
  return log(log(wv / m_min_value) / log(m_max_value / wv));
}
 
 
double ExpSigmoidConverter::engineToWorld(const double engine_value) const {
  auto clamped_value = std::max(-50.0, std::min(50.0, engine_value));
  return m_min_value * exp( log(m_max_value / m_min_value) / (1 + exp(-clamped_value)) );
}
 
double ExpSigmoidConverter::getEngineToWorldDerivative(const double value) const {
  return value * log(value / m_min_value) * log(m_max_value / value) / log(m_max_value / m_min_value);
}
 
 
}// namespace ModelFitting