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introduce semi-deterministic smearing for e/gamma objects #20878

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Oct 12, 2017
Merged

introduce semi-deterministic smearing for e/gamma objects #20878

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23 changes: 21 additions & 2 deletions EgammaAnalysis/ElectronTools/plugins/CalibratedElectronProducersRun2.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -17,14 +17,16 @@
#include "EgammaAnalysis/ElectronTools/interface/ElectronEnergyCalibratorRun2.h"

#include <vector>
#include <random>
#include <TRandom2.h>

template<typename T>
class CalibratedElectronProducerRun2T: public edm::stream::EDProducer<>
{
public:
explicit CalibratedElectronProducerRun2T( const edm::ParameterSet & ) ;
virtual ~CalibratedElectronProducerRun2T();
virtual void produce( edm::Event &, const edm::EventSetup & ) override ;
~CalibratedElectronProducerRun2T() override;
void produce( edm::Event &, const edm::EventSetup & ) override ;

private:
edm::EDGetTokenT<edm::View<T> > theElectronToken;
Expand All @@ -33,6 +35,8 @@ class CalibratedElectronProducerRun2T: public edm::stream::EDProducer<>

EpCombinationTool theEpCombinationTool;
ElectronEnergyCalibratorRun2 theEnCorrectorRun2;
std::unique_ptr<TRandom> theSemiDeterministicRng;

};

template<typename T>
Expand All @@ -42,6 +46,10 @@ CalibratedElectronProducerRun2T<T>::CalibratedElectronProducerRun2T( const edm::
theEpCombinationTool(),
theEnCorrectorRun2(theEpCombinationTool, conf.getParameter<bool>("isMC"), conf.getParameter<bool>("isSynchronization"), conf.getParameter<std::string>("correctionFile"))
{
if (conf.existsAs<bool>("semiDeterministic") && conf.getParameter<bool>("semiDeterministic")) {
theSemiDeterministicRng.reset(new TRandom2());
theEnCorrectorRun2.initPrivateRng(theSemiDeterministicRng.get());
}
produces<std::vector<T> >();
}

Expand All @@ -63,6 +71,17 @@ CalibratedElectronProducerRun2T<T>::produce( edm::Event & iEvent, const edm::Eve
std::unique_ptr<std::vector<T> > out(new std::vector<T>());
out->reserve(in->size());

if (theSemiDeterministicRng && !in->empty()) { // no need to set a seed if in is empty
const auto & first = in->front();
std::seed_seq seeder = {int(iEvent.id().event()), int(iEvent.id().luminosityBlock()), int(iEvent.id().run()),
int(in->size()), int(std::numeric_limits<int>::max()*first.phi()/M_PI) & 0xFFF, int(first.pdgId())};
uint32_t seed = 0, tries = 10;
do {
seeder.generate(&seed,&seed+1); tries++;
} while (seed == 0 && tries < 10);
theSemiDeterministicRng->SetSeed(seed ? seed : iEvent.id().event());
}

for (const T &ele : *in) {
out->push_back(ele);
theEnCorrectorRun2.calibrate(out->back(), iEvent.id().run(), iEvent.streamID());
Expand Down
22 changes: 20 additions & 2 deletions EgammaAnalysis/ElectronTools/plugins/CalibratedPhotonProducersRun2.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -13,24 +13,31 @@
#include "EgammaAnalysis/ElectronTools/interface/PhotonEnergyCalibratorRun2.h"

#include <vector>
#include <random>
#include <TRandom2.h>

template<typename T>
class CalibratedPhotonProducerRun2T: public edm::stream::EDProducer<> {
public:
explicit CalibratedPhotonProducerRun2T( const edm::ParameterSet & ) ;
virtual ~CalibratedPhotonProducerRun2T();
virtual void produce( edm::Event &, const edm::EventSetup & ) override ;
~CalibratedPhotonProducerRun2T() override;
void produce( edm::Event &, const edm::EventSetup & ) override ;

private:
edm::EDGetTokenT<edm::View<T> > thePhotonToken;
PhotonEnergyCalibratorRun2 theEnCorrectorRun2;
std::unique_ptr<TRandom> theSemiDeterministicRng;
};

template<typename T>
CalibratedPhotonProducerRun2T<T>::CalibratedPhotonProducerRun2T( const edm::ParameterSet & conf ) :
thePhotonToken(consumes<edm::View<T> >(conf.getParameter<edm::InputTag>("photons"))),
theEnCorrectorRun2(conf.getParameter<bool>("isMC"), conf.getParameter<bool>("isSynchronization"), conf.getParameter<std::string >("correctionFile")) {

if (conf.existsAs<bool>("semiDeterministic") && conf.getParameter<bool>("semiDeterministic")) {
theSemiDeterministicRng.reset(new TRandom2());
theEnCorrectorRun2.initPrivateRng(theSemiDeterministicRng.get());
}
produces<std::vector<T> >();
}

Expand All @@ -45,6 +52,17 @@ CalibratedPhotonProducerRun2T<T>::produce( edm::Event & iEvent, const edm::Event
edm::Handle<edm::View<T> > in;
iEvent.getByToken(thePhotonToken, in);

if (theSemiDeterministicRng && !in->empty()) { // no need to set a seed if in is empty
const auto & first = in->front();
std::seed_seq seeder = {int(iEvent.id().event()), int(iEvent.id().luminosityBlock()), int(iEvent.id().run()),
int(in->size()), int(std::numeric_limits<int>::max()*first.phi()/M_PI) & 0xFFF, int(first.pdgId())};
uint32_t seed = 0, tries = 10;
do {
seeder.generate(&seed,&seed+1); tries++;
} while (seed == 0 && tries < 10);
theSemiDeterministicRng->SetSeed(seed ? seed : iEvent.id().event());
}

std::unique_ptr<std::vector<T> > out(new std::vector<T>());
out->reserve(in->size());

Expand Down