ImpactParameter/interface/TemplatedJetProbabilityComputer.h

0001 #ifndef ImpactParameter_TemplatedJetProbabilityComputer_h
0002 #define ImpactParameter_TemplatedJetProbabilityComputer_h
0003
0004 #include "FWCore/MessageLogger/interface/MessageLogger.h"
0005 #include "DataFormats/TrackReco/interface/Track.h"
0006 #include "DataFormats/BTauReco/interface/TrackProbabilityTagInfo.h"
0007 #include "DataFormats/BTauReco/interface/TrackIPTagInfo.h"
0008 #include "DataFormats/VertexReco/interface/Vertex.h"
0009 #include "Math/GenVector/VectorUtil.h"
0010 #include "RecoBTau/JetTagComputer/interface/JetTagComputer.h"
0011
0012 #include <iostream>
0013
0014 template <class Container, class Base>
0015 class TemplatedJetProbabilityComputer : public JetTagComputer {
0016 public:
0017   using Tokens = void;
0018
0019   typedef reco::IPTagInfo<Container, Base> TagInfo;
0020
0021   TemplatedJetProbabilityComputer(const edm::ParameterSet& parameters) {
0022     m_ipType = parameters.getParameter<int>("impactParameterType");
0023     m_minTrackProb = parameters.getParameter<double>("minimumProbability");
0024     m_deltaR = parameters.getParameter<double>("deltaR");
0025     m_trackSign = parameters.getParameter<int>("trackIpSign");
0026     m_cutMaxDecayLen = parameters.getParameter<double>("maximumDecayLength");
0027     m_cutMaxDistToAxis = parameters.getParameter<double>("maximumDistanceToJetAxis");
0028     //
0029     // access track quality class; "any" takes everything
0030     //
0031     std::string trackQualityType = parameters.getParameter<std::string>("trackQualityClass");  //used
0032     m_trackQuality = reco::TrackBase::qualityByName(trackQualityType);
0033     m_useAllQualities = false;
0034     if (trackQualityType == "any" || trackQualityType == "Any" || trackQualityType == "ANY")
0035       m_useAllQualities = true;
0036
0037     useVariableJTA_ = parameters.getParameter<bool>("useVariableJTA");
0038     if (useVariableJTA_)
0039       varJTApars = {parameters.getParameter<double>("a_dR"),
0040                     parameters.getParameter<double>("b_dR"),
0041                     parameters.getParameter<double>("a_pT"),
0042                     parameters.getParameter<double>("b_pT"),
0043                     parameters.getParameter<double>("min_pT"),
0044                     parameters.getParameter<double>("max_pT"),
0045                     parameters.getParameter<double>("min_pT_dRcut"),
0046                     parameters.getParameter<double>("max_pT_dRcut"),
0047                     parameters.getParameter<double>("max_pT_trackPTcut")};
0048
0049     uses("ipTagInfos");
0050   }
0051
0052   float discriminator(const TagInfoHelper& ti) const override {
0053     const TagInfo& tkip = ti.get<TagInfo>();
0054     const Container& tracks(tkip.selectedTracks());
0055     const std::vector<float>& allProbabilities((tkip.probabilities(m_ipType)));
0056     const std::vector<reco::btag::TrackIPData>& impactParameters((tkip.impactParameterData()));
0057
0058     if (tkip.primaryVertex().isNull())
0059       return 0;
0060
0061     GlobalPoint pv(tkip.primaryVertex()->position().x(),
0062                    tkip.primaryVertex()->position().y(),
0063                    tkip.primaryVertex()->position().z());
0064
0065     std::vector<float> probabilities;
0066     int i = 0;
0067     for (std::vector<float>::const_iterator it = allProbabilities.begin(); it != allProbabilities.end(); ++it, i++) {
0068       if (fabs(impactParameters[i].distanceToJetAxis.value()) < m_cutMaxDistToAxis &&  // distance to JetAxis
0069           (impactParameters[i].closestToJetAxis - pv).mag() < m_cutMaxDecayLen &&      // max decay len
0070           (m_useAllQualities == true ||
0071            reco::btag::toTrack(tracks[i])->quality(m_trackQuality))  // use selected track qualities
0072       ) {
0073         float p;
0074         if (m_trackSign == 0) {
0075           if (*it >= 0) {
0076             p = *it / 2.;
0077           } else {
0078             p = 1. + *it / 2.;
0079           }
0080         } else if (m_trackSign > 0) {
0081           if (*it >= 0)
0082             p = *it;
0083           else
0084             continue;
0085         } else {
0086           if (*it <= 0)
0087             p = -*it;
0088           else
0089             continue;
0090         }
0091         if (useVariableJTA_) {
0092           if (tkip.variableJTA(varJTApars)[i])
0093             probabilities.push_back(p);
0094         } else {
0095           if (m_deltaR <= 0 ||
0096               ROOT::Math::VectorUtil::DeltaR((*tkip.jet()).p4().Vect(), (*tracks[i]).momentum()) < m_deltaR)
0097             probabilities.push_back(p);
0098         }
0099       }
0100     }
0101     return jetProbability(probabilities);
0102   }
0103
0104   double jetProbability(const std::vector<float>& v) const {
0105     int ngoodtracks = v.size();
0106     double SumJet = 0.;
0107
0108     for (std::vector<float>::const_iterator q = v.begin(); q != v.end(); q++) {
0109       SumJet += (*q > m_minTrackProb) ? log(*q) : log(m_minTrackProb);
0110     }
0111
0112     double ProbJet;
0113     double Loginvlog = 0;
0114
0115     if (SumJet < 0.) {
0116       if (ngoodtracks >= 2) {
0117         Loginvlog = log(-SumJet);
0118       }
0119       double Prob = 1.;
0120       double lfact = 1.;
0121       for (int l = 1; l != ngoodtracks; l++) {
0122         lfact *= l;
0123         Prob += exp(l * Loginvlog - log(1. * lfact));
0124       }
0125       double LogProb = log(Prob);
0126       ProbJet = std::min(exp(std::max(LogProb + SumJet, -30.)), 1.);
0127     } else {
0128       ProbJet = 1.;
0129     }
0130     if (ProbJet > 1)
0131       std::cout << "ProbJet too high: " << ProbJet << std::endl;
0132
0133     //double LogProbJet=-log(ProbJet);
0134     //  //return 1.-ProbJet;
0135     return -log10(ProbJet) / 4.;
0136   }
0137
0138 private:
0139   bool useVariableJTA_;
0140   reco::btag::variableJTAParameters varJTApars;
0141   double m_minTrackProb;
0142   int m_ipType;
0143   double m_deltaR;
0144   int m_trackSign;
0145   double m_cutMaxDecayLen;
0146   double m_cutMaxDistToAxis;
0147   reco::TrackBase::TrackQuality m_trackQuality;
0148   bool m_useAllQualities;
0149 };
0150
0151 #endif  // ImpactParameter_TemplatedJetProbabilityComputer_h