MVAValueMapProducer.h

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#ifndef __RecoEgamma_EgammaTools_MVAValueMapProducer_H__
#define __RecoEgamma_EgammaTools_MVAValueMapProducer_H__

#include "DataFormats/Common/interface/ValueMap.h"
#include "DataFormats/Common/interface/View.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/global/EDProducer.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "RecoEgamma/EgammaTools/interface/AnyMVAEstimatorRun2Base.h"
#include "RecoEgamma/EgammaTools/interface/Utils.h"
#include "RecoEgamma/EgammaTools/interface/MultiToken.h"
#include "RecoEgamma/EgammaTools/interface/MVAVariableHelper.h"

#include <memory>
#include <vector>
#include <cmath>

template <class ParticleType>
class MVAValueMapProducer : public edm::global::EDProducer<> {

  public:

  MVAValueMapProducer(const edm::ParameterSet&);
  ~MVAValueMapProducer() override {}

  static void fillDescriptions(edm::ConfigurationDescriptions& descriptions);

  private:

  void produce(edm::StreamID, edm::Event&, const edm::EventSetup&) const override;

  // for AOD and MiniAOD case
  const MultiTokenT<edm::View<ParticleType>> src_;

  // MVA estimators
  const std::vector<std::unique_ptr<AnyMVAEstimatorRun2Base>> mvaEstimators_;

  // Value map names
  const std::vector<std::string> mvaValueMapNames_;
  const std::vector<std::string> mvaRawValueMapNames_;
  const std::vector<std::string> mvaCategoriesMapNames_;

  // To get the auxiliary MVA variables
  const MVAVariableHelper<ParticleType> variableHelper_;

};

namespace {

    auto getMVAEstimators(const edm::VParameterSet& vConfig)
    {
      std::vector<std::unique_ptr<AnyMVAEstimatorRun2Base>> mvaEstimators;

      // Loop over the list of MVA configurations passed here from python and
      // construct all requested MVA estimators.
      for( auto &imva : vConfig )
      {

        // The factory below constructs the MVA of the appropriate type based
        // on the "mvaName" which is the name of the derived MVA class (plugin)
        if( !imva.empty() ) {

          mvaEstimators.emplace_back(AnyMVAEstimatorRun2Factory::get()->create(
                      imva.getParameter<std::string>("mvaName"), imva));

        } else
          throw cms::Exception(" MVA configuration not found: ")
            << " failed to find proper configuration for one of the MVAs in the main python script " << std::endl;
      }

      return mvaEstimators;
    }

    std::vector<std::string> getValueMapNames(const edm::VParameterSet& vConfig, std::string && suffix)
    {
      std::vector<std::string> names;
      for( auto &imva : vConfig )
      {
        names.push_back(imva.getParameter<std::string>("mvaName") + imva.getParameter<std::string>("mvaTag") + suffix);
      }

      return names;
    }
}

template <class ParticleType>
MVAValueMapProducer<ParticleType>::MVAValueMapProducer(const edm::ParameterSet& iConfig)
  : src_(consumesCollector(), iConfig, "src", "srcMiniAOD")
  , mvaEstimators_(getMVAEstimators(iConfig.getParameterSetVector("mvaConfigurations")))
  , mvaValueMapNames_     (getValueMapNames(iConfig.getParameterSetVector("mvaConfigurations"), "Values"    ))
  , mvaRawValueMapNames_  (getValueMapNames(iConfig.getParameterSetVector("mvaConfigurations"), "RawValues" ))
  , mvaCategoriesMapNames_(getValueMapNames(iConfig.getParameterSetVector("mvaConfigurations"), "Categories"))
  , variableHelper_(consumesCollector())
{
  for( auto const& name : mvaValueMapNames_      ) produces<edm::ValueMap<float>>(name);
  for( auto const& name : mvaRawValueMapNames_   ) produces<edm::ValueMap<float>>(name);
  for( auto const& name : mvaCategoriesMapNames_ ) produces<edm::ValueMap<int  >>(name);
}

template <class ParticleType>
void MVAValueMapProducer<ParticleType>::produce(edm::StreamID, edm::Event& iEvent, const edm::EventSetup& iSetup) const
{

  edm::Handle<edm::View<ParticleType> > src = src_.getValidHandle(iEvent);

  // Loop over MVA estimators
  for( unsigned iEstimator = 0; iEstimator < mvaEstimators_.size(); iEstimator++ ){

    std::vector<float> mvaValues;
    std::vector<float> mvaRawValues;
    std::vector<int>   mvaCategories;

    // Loop over particles
    for (auto const& cand : src->ptrs())
    {
      std::vector<float> auxVariables = variableHelper_.getAuxVariables(cand, iEvent);

      int cat = -1; // Passed by reference to the mvaValue function to store the category
      const float response = mvaEstimators_[iEstimator]->mvaValue( cand.get(), auxVariables, cat );
      mvaRawValues.push_back( response ); // The MVA score
      mvaValues.push_back( 2.0/(1.0+exp(-2.0*response))-1 ); // MVA output between -1 and 1
      mvaCategories.push_back( cat );
    } // end loop over particles

    writeValueMap(iEvent, src, mvaValues    , mvaValueMapNames_     [iEstimator] );
    writeValueMap(iEvent, src, mvaRawValues , mvaRawValueMapNames_  [iEstimator] );
    writeValueMap(iEvent, src, mvaCategories, mvaCategoriesMapNames_[iEstimator] );

  } // end loop over estimators

}

template <class ParticleType>
  void MVAValueMapProducer<ParticleType>::fillDescriptions(edm::ConfigurationDescriptions& descriptions) {
  //The following says we do not know what parameters are allowed so do no validation
  // Please change this to state exactly what you do use, even if it is no parameters
  edm::ParameterSetDescription desc;
  desc.setUnknown();
  descriptions.addDefault(desc);
}

#endif