PhotonMVAEstimator.cc

Go to the documentation of this file.

#include "RecoEgamma/PhotonIdentification/interface/PhotonMVAEstimator.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "CommonTools/MVAUtils/interface/GBRForestTools.h"

PhotonMVAEstimator::PhotonMVAEstimator(const edm::ParameterSet& conf)
  : AnyMVAEstimatorRun2Base(conf)
  , mvaVarMngr_ (conf.getParameter<std::string>("variableDefinition"))
{

  //
  // Construct the MVA estimators
  //
  if (getTag() == "Run2Spring16NonTrigV1") {
      effectiveAreas_ = std::make_unique<EffectiveAreas>((conf.getParameter<edm::FileInPath>("effAreasConfigFile")).fullPath());
      phoIsoPtScalingCoeff_ = conf.getParameter<std::vector<double >>("phoIsoPtScalingCoeff");
      phoIsoCutoff_ = conf.getParameter<double>("phoIsoCutoff");
  }

  const auto weightFileNames = conf.getParameter<std::vector<std::string> >("weightFileNames");
  const auto categoryCutStrings = conf.getParameter<std::vector<std::string> >("categoryCuts");

  if( (int)(categoryCutStrings.size()) != getNCategories() )
    throw cms::Exception("MVA config failure: ")
      << "wrong number of category cuts in PhotonMVAEstimator" << getTag() << std::endl;

  for (auto const& cut : categoryCutStrings) categoryFunctions_.emplace_back(cut);

  // Initialize GBRForests
  if( static_cast<int>(weightFileNames.size()) != getNCategories() )
    throw cms::Exception("MVA config failure: ")
      << "wrong number of weightfiles in PhotonMVAEstimator" << getTag() << std::endl;

  gbrForests_.clear();
  // Create a TMVA reader object for each category
  for(int i=0; i<getNCategories(); i++){

    std::vector<int> variablesInCategory;

    std::vector<std::string> variableNamesInCategory;
    gbrForests_.push_back(createGBRForest(weightFileNames[i], variableNamesInCategory));

    nVariables_.push_back(variableNamesInCategory.size());

    variables_.push_back(variablesInCategory);

    for (int j=0; j<nVariables_[i];++j) {
        int index = mvaVarMngr_.getVarIndex(variableNamesInCategory[j]);
        if(index == -1) {
            throw cms::Exception("MVA config failure: ")
               << "Concerning PhotonMVAEstimator" << getTag() << std::endl
               << "Variable " << variableNamesInCategory[j]
               << " not found in variable definition file!" << std::endl;
        }
        variables_[i].push_back(index);

    }
  }
}

float PhotonMVAEstimator::
mvaValue(const reco::Candidate* candPtr, std::vector<float> const& auxVars, int &iCategory) const {

  const reco::Photon* phoPtr = dynamic_cast<const reco::Photon*>(candPtr);
  if( phoPtr == nullptr) {
    throw cms::Exception("MVA failure: ")
      << " given particle is expected to be reco::Photon or pat::Photon," << std::endl
      << " but appears to be neither" << std::endl;
  }

  iCategory = findCategory( phoPtr );

  std::vector<float> vars;

  for (int i = 0; i < nVariables_[iCategory]; ++i) {
      vars.push_back(mvaVarMngr_.getValue(variables_[iCategory][i], *phoPtr, auxVars));
  }

  // Special case for Spring16!
  if (getTag() == "Run2Spring16NonTrigV1" and iCategory == 1) { // Endcap category
      // Raw value for EB only, because of loss of transparency in EE
      // for endcap MVA only in 2016
      double eA = effectiveAreas_->getEffectiveArea( std::abs(phoPtr->superCluster()->eta()) );
      double phoIsoCorr = vars[10] - eA*(double)vars[9] - phoIsoPtScalingCoeff_.at(1) * phoPtr->pt();
      vars[10] = TMath::Max( phoIsoCorr, phoIsoCutoff_);
  }

  if(isDebug()) {
    std::cout << " *** Inside PhotonMVAEstimator" << getTag() << std::endl;
    std::cout << " category " << iCategory << std::endl;
    for (int i = 0; i < nVariables_[iCategory]; ++i) {
        std::cout << " " << mvaVarMngr_.getName(variables_[iCategory][i]) << " " << vars[i] << std::endl;
    }
  }

  const float response = gbrForests_.at(iCategory)->GetResponse(vars.data());

  if(isDebug()) {
    std::cout << " ### MVA " << response << std::endl << std::endl;
  }

  return response;
}

int PhotonMVAEstimator::findCategory( const reco::Candidate* candPtr) const {

  const reco::Photon* phoPtr = dynamic_cast<const reco::Photon*>(candPtr);
  if( phoPtr == nullptr ) {
    throw cms::Exception("MVA failure: ")
      << " given particle is expected to be reco::Photon or pat::Photon," << std::endl
      << " but appears to be neither" << std::endl;
  }

  return findCategory(*phoPtr);

}

int PhotonMVAEstimator::findCategory(reco::Photon const& photon) const {

  for (int i = 0; i < getNCategories(); ++i) {
      if (categoryFunctions_[i](photon)) return i;
  }

  edm::LogWarning  ("MVA warning") <<
      "category not defined for particle with pt " << photon.pt() << " GeV, eta " <<
          photon.superCluster()->eta() << " in PhotonMVAEstimator" << getTag();

  return -1;

}

DEFINE_EDM_PLUGIN(AnyMVAEstimatorRun2Factory,
          PhotonMVAEstimator,
          "PhotonMVAEstimator");