MTDTrackQualityMVA.cc

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#include "RecoMTD/TimingIDTools/interface/MTDTrackQualityMVA.h"
 
MTDTrackQualityMVA::MTDTrackQualityMVA(std::string weights_file) {
  std::string options("!Color:Silent");
  std::string method("BDT");
 
  std::string vars_array[] = {MTDTRACKQUALITYMVA_VARS(MTDBDTVAR_STRING)};
  int nvars = sizeof(vars_array) / sizeof(vars_array[0]);
  vars_.assign(vars_array, vars_array + nvars);
 
  mva_ = std::make_unique<TMVAEvaluator>();
  mva_->initialize(options, method, weights_file, vars_, spec_vars_, true, false);  //use GBR, GradBoost
}
 
float MTDTrackQualityMVA::operator()(const reco::TrackRef& trk,
                                     const edm::ValueMap<int>& npixBarrels,
                                     const edm::ValueMap<int>& npixEndcaps,
                                     const edm::ValueMap<float>& btl_chi2s,
                                     const edm::ValueMap<float>& btl_time_chi2s,
                                     const edm::ValueMap<float>& etl_chi2s,
                                     const edm::ValueMap<float>& etl_time_chi2s,
                                     const edm::ValueMap<float>& tmtds,
                                     const edm::ValueMap<float>& trk_lengths) const {
  std::map<std::string, float> vars;
 
  //---training performed only above 0.5 GeV
  constexpr float minPtForMVA = 0.5;
  if (trk->pt() < minPtForMVA)
    return -1;
 
  //---training performed only for tracks with MTD hits
  if (tmtds[trk] > 0) {
    vars.emplace(vars_[int(VarID::pt)], trk->pt());
    vars.emplace(vars_[int(VarID::eta)], trk->eta());
    vars.emplace(vars_[int(VarID::phi)], trk->phi());
    vars.emplace(vars_[int(VarID::chi2)], trk->chi2());
    vars.emplace(vars_[int(VarID::ndof)], trk->ndof());
    vars.emplace(vars_[int(VarID::numberOfValidHits)], trk->numberOfValidHits());
    vars.emplace(vars_[int(VarID::numberOfValidPixelBarrelHits)], npixBarrels[trk]);
    vars.emplace(vars_[int(VarID::numberOfValidPixelEndcapHits)], npixEndcaps[trk]);
    vars.emplace(vars_[int(VarID::btlMatchChi2)], btl_chi2s.contains(trk.id()) ? btl_chi2s[trk] : -1);
    vars.emplace(vars_[int(VarID::btlMatchTimeChi2)], btl_time_chi2s.contains(trk.id()) ? btl_time_chi2s[trk] : -1);
    vars.emplace(vars_[int(VarID::etlMatchChi2)], etl_chi2s.contains(trk.id()) ? etl_chi2s[trk] : -1);
    vars.emplace(vars_[int(VarID::etlMatchTimeChi2)], etl_time_chi2s.contains(trk.id()) ? etl_time_chi2s[trk] : -1);
    vars.emplace(vars_[int(VarID::mtdt)], tmtds[trk]);
    vars.emplace(vars_[int(VarID::path_len)], trk_lengths[trk]);
    return 1. / (1 + sqrt(2 / (1 + mva_->evaluate(vars, false)) - 1));  //return values between 0-1 (probability)
  } else
    return -1;
}