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#include <functional>
#include <algorithm>
#include <vector>
#include <memory>
#include <string>
#include <Math/GenVector/Cartesian3D.h>
#include <Math/GenVector/VectorUtil.h>
#include "DQMOffline/RecoB/interface/MatchJet.h"
#include "Matching.h"
using namespace btag;
namespace {
inline double sqr(double val) { return val * val; }
} // namespace
MatchJet::MatchJet(const edm::ParameterSet& pSet)
: maxChi2(pSet.getParameter<double>("maxChi2")),
sigmaDeltaR2(sqr(pSet.getParameter<double>("sigmaDeltaR"))),
sigmaDeltaE2(sqr(pSet.getParameter<double>("sigmaDeltaE"))),
threshold(1.0) {}
void MatchJet::matchCollections(const edm::RefToBaseVector<reco::Jet>& refJets_,
const edm::RefToBaseVector<reco::Jet>& recJets_,
const reco::JetCorrector* corrector) {
refJetCorrector.setCorrector(corrector);
recJetCorrector.setCorrector(corrector);
typedef ROOT::Math::Cartesian3D<double> Vector;
std::vector<Vector> corrRefJets;
refJets.clear();
for (edm::RefToBaseVector<reco::Jet>::const_iterator iter = refJets.begin(); iter != refJets_.end(); ++iter) {
edm::RefToBase<reco::Jet> jetRef = *iter;
reco::Jet jet = refJetCorrector(*jetRef);
if (jet.energy() < threshold)
continue;
corrRefJets.push_back(Vector(jet.px(), jet.py(), jet.pz()));
refJets.push_back(jetRef);
}
std::vector<Vector> corrRecJets;
recJets.clear();
for (edm::RefToBaseVector<reco::Jet>::const_iterator iter = recJets.begin(); iter != recJets_.end(); ++iter) {
edm::RefToBase<reco::Jet> jetRec = *iter;
reco::Jet jet = recJetCorrector(*jetRec);
if (jet.energy() < threshold)
continue;
corrRecJets.push_back(Vector(jet.px(), jet.py(), jet.pz()));
recJets.push_back(jetRec);
}
refToRec.clear();
refToRec.resize(refJets.size(), -1);
recToRef.clear();
recToRef.resize(recJets.size(), -1);
Matching<double> matching(corrRefJets, corrRecJets, [this](auto& v1, auto& v2) {
double x = ROOT::Math::VectorUtil::DeltaR2(v1, v2) / this->sigmaDeltaR2 +
sqr(2. * (v1.R() - v2.R()) / (v1.R() + v2.R())) / this->sigmaDeltaE2;
// Possible debug output
// std::cout << "xxx " << ROOT::Math::VectorUtil::DeltaPhi(v1, v2) << " " << (v1.Eta() - v2.Eta())
// << " " << (v1.R() - v2.R()) / (v1.R() + v2.R()) << " " << x << std::endl;
return x;
});
typedef Matching<double>::Match Match;
const std::vector<Match>& matches = matching.match(std::less<double>(), [&](auto& c) { return c < this->maxChi2; });
for (std::vector<Match>::const_iterator iter = matches.begin(); iter != matches.end(); ++iter) {
refToRec[iter->index1] = iter->index2;
recToRef[iter->index2] = iter->index1;
}
}
edm::RefToBase<reco::Jet> MatchJet::operator()(const edm::RefToBase<reco::Jet>& recJet) const {
edm::RefToBase<reco::Jet> result;
if (recJet.id() != recJets.id())
return result;
for (unsigned int i = 0; i != recJets.size(); ++i) {
if (recJets[i] == recJet) {
int match = recToRef[i];
if (match >= 0)
result = refJets[match];
break;
}
}
return result;
}
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