AsgForwardElectronLikelihoodTool.cxx

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/*
  Copyright (C) 2002-2023 CERN for the benefit of the ATLAS collaboration
*/
 
// Include this class's header
#include "ElectronPhotonSelectorTools/AsgForwardElectronLikelihoodTool.h"
#include "EGSelectorConfigurationMapping.h"
#include "EgammaAnalysisHelpers/AsgEGammaConfigHelper.h"
#include "TForwardElectronLikelihoodTool.h"
 
// STL includes
#include <cmath>
#include <cstdint>
#include <string>
 
// EDM includes
#include "AsgDataHandles/ReadHandle.h"
#include "AsgTools/CurrentContext.h"
#include "PathResolver/PathResolver.h"
#include "TEnv.h"
#include "xAODCaloEvent/CaloCluster.h"
#include "xAODEgamma/Electron.h"
#include "xAODTracking/Vertex.h"
 
//=============================================================================
// Standard constructor
//=============================================================================
AsgForwardElectronLikelihoodTool::AsgForwardElectronLikelihoodTool(
  const std::string& myname)
  : AsgTool(myname)
  , m_configFile{ "" }
  , m_rootForwardTool{ nullptr }
{
 
  // Create an instance of the underlying ROOT tool
  m_rootForwardTool =
    new Root::TForwardElectronLikelihoodTool(("T" + myname).c_str());
 
  // Declare the needed properties
  declareProperty("WorkingPoint", m_WorkingPoint = "", "The Working Point");
  declareProperty("ConfigFile", m_configFile = "", "The config file to use");
  declareProperty(
    "usePVContainer", m_usePVCont = true, "Whether to use the PV container");
  declareProperty(
    "nPVdefault", m_nPVdefault = 0, "The default number of PVs if not counted");
  //
  // Configurables in the root tool
  //
  // pdf file name. Managed in the Asg tool.
  declareProperty("inputPDFFileName",
                  m_pdfFileName = "",
                  "The input ROOT file name that holds the PDFs");
  // the variable names, if non-standard - nope, it's done above!
  declareProperty("VariableNames",
                  m_rootForwardTool->m_variableNames,
                  "Variable names input to the LH");
 
  // The likelihood cut values
  declareProperty("CutLikelihood",
                  m_rootForwardTool->m_cutLikelihood,
                  "Cut on likelihood discriminant");
  // do pileup-dependent discriminant cut
  declareProperty("DiscCutSlopeForPileupTransform",
                  m_rootForwardTool->m_cutLikelihoodPileupCorrectionA,
                  "Slope correction for pileup dependent discriminant cut");
  declareProperty("DiscCutForPileupTransform",
                  m_rootForwardTool->m_cutLikelihoodPileupCorrectionB,
                  "Additional offset for pileup dependent discriminant cut");
  declareProperty("doPileupCorrection",
                  m_rootForwardTool->m_doPileupCorrection,
                  "Do pileup-dependent discriminant cut");
}
 
//=============================================================================
// Standard destructor
//=============================================================================
AsgForwardElectronLikelihoodTool::~AsgForwardElectronLikelihoodTool()
{
  delete m_rootForwardTool;
}
 
//=============================================================================
// Asg/Athena initialize method
//=============================================================================
StatusCode
AsgForwardElectronLikelihoodTool::initialize()
{
 
  ATH_MSG_INFO("initialize : WP " << m_WorkingPoint.size() << " "
                                  << m_configFile.size());
 
  std::string PDFfilename(""); // Default
 
  if (!m_WorkingPoint.empty()) {
    m_configFile = AsgConfigHelper::findConfigFile(
      m_WorkingPoint, EgammaSelectors::ForwardLHPointToConfFile);
    ATH_MSG_INFO("operating point : " << this->getOperatingPointName());
  }
 
  if (!m_configFile.empty()) {
    std::string configFile = PathResolverFindCalibFile(m_configFile);
    if (configFile.empty()) {
      ATH_MSG_ERROR("Could not locate " << m_configFile);
      return StatusCode::FAILURE;
    }
 
    ATH_MSG_DEBUG("Get the input PDFs in the tool ");
    TEnv env;
    env.ReadFile(configFile.c_str(), kEnvLocal);
 
    // Get the input PDFs in the tool.
    ATH_MSG_DEBUG("Get the input PDFs in the tool ");
 
    if (!m_pdfFileName
           .empty()) { // If the property was set by the user, take that.
      ATH_MSG_INFO("Setting user specified PDF file " << m_pdfFileName);
      PDFfilename = m_pdfFileName;
    } else {
      if (m_configFile.find("dev/") != std::string::npos) {
        std::string PDFdevval = env.GetValue(
          "inputPDFFileName",
          "ElectronPhotonSelectorTools/offline/mc16_20180716/"
          "ForwardElectronLikelihoodPdfs.root"); // this is the first PDF ever
                                                 // released
        PDFfilename = ("dev/" + PDFdevval);
        ATH_MSG_DEBUG("Getting the input PDFs from: " << PDFfilename);
      } else {
        PDFfilename =
          env.GetValue("inputPDFFileName",
                       "ElectronPhotonSelectorTools/offline/mc16_20180716/"
                       "ForwardElectronLikelihoodPdfs.root");
        ATH_MSG_DEBUG("Getting the input PDFs from: " << PDFfilename);
      }
    }
    std::string filename = PathResolverFindCalibFile(PDFfilename);
 
    if (!filename.empty()) {
      m_rootForwardTool->setPDFFileName(filename);
    } else {
      ATH_MSG_ERROR("Could not find PDF file");
      return StatusCode::FAILURE;
    }
 
    m_rootForwardTool->m_variableNames = env.GetValue("VariableNames", "");
    m_rootForwardTool->m_cutLikelihood =
      AsgConfigHelper::HelperDouble("CutLikelihood", env);
    m_rootForwardTool->m_cutLikelihoodPileupCorrectionA =
      AsgConfigHelper::HelperDouble("DiscCutSlopeForPileupCorrection", env);
    m_rootForwardTool->m_cutLikelihoodPileupCorrectionB =
      AsgConfigHelper::HelperDouble("DiscCutForPileupCorrection", env);
    m_rootForwardTool->m_doPileupCorrection =
      env.GetValue("doPileupCorrection", false);
  } else { // Error if it cant find the conf
    ATH_MSG_ERROR("Could not find configuration file");
    return StatusCode::FAILURE;
  }
 
 
  // Setup primary vertex key handle
  ATH_CHECK(m_primVtxContKey.initialize(m_usePVCont));
 
  // Get the name of the current operating point, and massage the other strings
  // accordingly
  ATH_MSG_VERBOSE(
    "Going to massage the labels based on the provided operating point...");
 
  // Get the message level and set the underlying ROOT tool message level
  // accordingly
  m_rootForwardTool->msg().setLevel(this->msg().level());
 
  // We need to initialize the underlying ROOT TSelectorTool
  if (m_rootForwardTool->initialize().isFailure()) {
    ATH_MSG_ERROR(
      "ERROR! Could not initialize the TForwardElectronLikelihoodTool!");
    return StatusCode::FAILURE;
  }
 
  return StatusCode::SUCCESS;
}
 
//=============================================================================
// return the accept info object
//=============================================================================
 
const asg::AcceptInfo&
AsgForwardElectronLikelihoodTool::getAcceptInfo() const
{
  return m_rootForwardTool->getAcceptInfo();
}
 
//=============================================================================
// The main accept method: the actual cuts are applied here
//=============================================================================
asg::AcceptData
AsgForwardElectronLikelihoodTool::accept(const xAOD::Egamma* eg,
                                         double mu) const
{
 
  const xAOD::Electron* el = dynamic_cast<const xAOD::Electron*>(eg);
  return accept(el, mu);
}
 
asg::AcceptData
AsgForwardElectronLikelihoodTool::accept(const xAOD::Electron* eg,
                                         double mu) const
{
 
  // Backwards compatbility
  return accept(Gaudi::Hive::currentContext(), eg, mu);
}
 
asg::AcceptData
AsgForwardElectronLikelihoodTool::accept(const EventContext& ctx,
                                         const xAOD::Egamma* eg,
                                         double mu) const
{
 
  const xAOD::Electron* el = dynamic_cast<const xAOD::Electron*>(eg);
  return accept(ctx, el, mu);
}
 
//=============================================================================
// The main accept method: the actual cuts are applied here
//=============================================================================
asg::AcceptData
AsgForwardElectronLikelihoodTool::accept(const EventContext& ctx,
                                         const xAOD::Electron* eg,
                                         double mu) const
{
  if (!eg) {
    ATH_MSG_ERROR("Failed, no egamma object.");
    return m_rootForwardTool->accept();
  }
 
  const xAOD::CaloCluster* cluster = eg->caloCluster();
  if (!cluster) {
    ATH_MSG_WARNING("Failed, no cluster.");
    return m_rootForwardTool->accept();
  }
 
  const double energy = cluster->e();
  const float eta = (cluster->eta());
  if (fabs(eta) > 300.0) {
    ATH_MSG_WARNING("Failed, eta > 3000.");
    return m_rootForwardTool->accept();
  }
 
  // transverse energy of the electron (using the track eta)
  double et = (cosh(eta) != 0.) ? energy / cosh(eta) : 0.;
  double ip(0);
 
  // Get the number of primary vertices in this event
  if (mu < 0) { // use npv if mu is negative (not given)
    ip = static_cast<double>(m_usePVCont ? this->getNPrimVertices(ctx)
                                         : m_nPVdefault);
  } else {
    ip = mu;
  }
 
  // for now don't cache.
  double likelihood = calculate(ctx, eg, ip);
 
  // Get the answer from the underlying ROOT tool
  return m_rootForwardTool->accept(likelihood, eta, et, ip);
}
 
//=============================================================================
// Calculate method for EFCaloLH in the trigger; do full LH if !CaloCutsOnly
//=============================================================================
double
AsgForwardElectronLikelihoodTool::calculate(const xAOD::Egamma* eg,
                                            double mu) const
{
 
  const xAOD::Electron* el = dynamic_cast<const xAOD::Electron*>(eg);
  return calculate(el, mu);
}
 
double
AsgForwardElectronLikelihoodTool::calculate(const xAOD::Electron* el,
                                            double mu) const
{
  // Backward compatbility
  return calculate(Gaudi::Hive::currentContext(), el, mu);
}
 
double
AsgForwardElectronLikelihoodTool::calculate(const EventContext& ctx,
                                            const xAOD::Egamma* eg,
                                            double mu) const
{
 
  const xAOD::Electron* el = dynamic_cast<const xAOD::Electron*>(eg);
  return calculate(ctx, el, mu);
}
 
//=============================================================================
// The main result method: the actual likelihood is calculated here
//=============================================================================
double
AsgForwardElectronLikelihoodTool::calculate(const EventContext& ctx,
                                            const xAOD::Electron* eg,
                                            double mu) const
{
  if (!eg) {
    ATH_MSG_ERROR("Failed, no egamma object.");
    return -999;
  }
 
  const xAOD::CaloCluster* cluster = eg->caloCluster();
  if (!cluster) {
    ATH_MSG_ERROR("Failed, no cluster.");
    return -999;
  }
 
  const double energy = cluster->e();
  const float eta = cluster->eta();
  if (fabs(eta) > 300.0) {
    ATH_MSG_ERROR("Failed, eta range.");
    ATH_MSG_ERROR("checking at other place ." << eta);
    return -999;
  }
 
  const double et = (cosh(eta) != 0.) ? energy / cosh(eta) : 0.;
 
  // Shower shape variables
  double secondDensity(0), significance(0), secondLambda(0), lateral(0),
    longitudinal(0), fracMax(0), secondR(0), centerLambda(0);
 
  bool allFound = true;
  std::string notFoundList = "";
 
  // secondLambda
  if (!cluster->retrieveMoment(xAOD::CaloCluster::SECOND_LAMBDA,
                               secondLambda)) {
    allFound = false;
    notFoundList += "secondLambda ";
  }
  // lateral
  if (!cluster->retrieveMoment(xAOD::CaloCluster::LATERAL, lateral)) {
    allFound = false;
    notFoundList += "lateral ";
  }
  // longitudinal
  if (!cluster->retrieveMoment(xAOD::CaloCluster::LONGITUDINAL, longitudinal)) {
    allFound = false;
    notFoundList += "longitudinal ";
  }
  // fracMax
  if (!cluster->retrieveMoment(xAOD::CaloCluster::ENG_FRAC_MAX, fracMax)) {
    allFound = false;
    notFoundList += "fracMax ";
  }
  // secondR
  if (!cluster->retrieveMoment(xAOD::CaloCluster::SECOND_R, secondR)) {
    allFound = false;
    notFoundList += "secondR ";
  }
  // centerlambda
  if (!cluster->retrieveMoment(xAOD::CaloCluster::CENTER_LAMBDA,
                               centerLambda)) {
    allFound = false;
    notFoundList += "centerLambda ";
  }
  if (!cluster->retrieveMoment(xAOD::CaloCluster::SECOND_ENG_DENS,
                               secondDensity)) {
    allFound = false;
    notFoundList += "secondDensity ";
  }
  if (!cluster->retrieveMoment(xAOD::CaloCluster::SIGNIFICANCE, significance)) {
    allFound = false;
    notFoundList += "significance ";
  }
 
  // Get the number of primary vertices in this event
  double ip = static_cast<double>(m_nPVdefault);
 
  if (mu < 0) { // use npv if mu is negative (not given)
    ip = static_cast<double>(m_usePVCont ? this->getNPrimVertices(ctx)
                                         : m_nPVdefault);
  } else {
    ip = mu;
  }
 
  ATH_MSG_VERBOSE(
    Form("Vars: eta=%8.5f, et=%8.5f, 2nd lambda=%8.5f, lateral=%8.5f, "
         "longitudinal=%8.5f, center lambda=%8.5f, frac max=%8.5f, "
         "secondR=%8.5f, significance=%8.5f, 2nd density=%8.5f, ip=%8.5f",
         eta,
         et,
         secondLambda,
         lateral,
         longitudinal,
         centerLambda,
         fracMax,
         secondR,
         significance,
         secondDensity,
         ip));
 
  if (!allFound) {
    ATH_MSG_ERROR(
      "Skipping LH calculation! The following variables are missing: "
      << notFoundList);
    return -999;
  }
 
  // Get the answer from the underlying ROOT tool
  return m_rootForwardTool->calculate(eta,
                                      et,
                                      secondLambda,
                                      lateral,
                                      longitudinal,
                                      centerLambda,
                                      fracMax,
                                      secondR,
                                      significance,
                                      secondDensity,
                                      ip);
}
 
//=============================================================================
//=============================================================================
std::string
AsgForwardElectronLikelihoodTool::getOperatingPointName() const
{
  return m_WorkingPoint;
}
//=============================================================================
asg::AcceptData
AsgForwardElectronLikelihoodTool::accept(const xAOD::IParticle* part) const
{
  // Backwards compatibility
  return accept(Gaudi::Hive::currentContext(), part);
}
 
asg::AcceptData
AsgForwardElectronLikelihoodTool::accept(const EventContext& ctx,
                                         const xAOD::IParticle* part) const
{
  if (part->type() == xAOD::Type::Electron) {
    const xAOD::Electron* el = static_cast<const xAOD::Electron*>(part);
    return accept(ctx, el);
  }
  ATH_MSG_ERROR("Input is not an electron");
  return m_rootForwardTool->accept();
}
//=============================================================================
double
AsgForwardElectronLikelihoodTool::calculate(const xAOD::IParticle* part) const
{
  // Backwards compatibily
  return calculate(Gaudi::Hive::currentContext(), part);
}
 
double
AsgForwardElectronLikelihoodTool::calculate(const EventContext& ctx,
                                            const xAOD::IParticle* part) const
{
  if (part->type() == xAOD::Type::Electron) {
    const xAOD::Electron* el = static_cast<const xAOD::Electron*>(part);
    return calculate(ctx, el);
  }
  ATH_MSG_ERROR("Input is not an electron");
  return -999;
}
 
//=============================================================================
// Helper method to get the number of primary vertices
// ( This is horrible! We don't want to iterate over all vertices in the event
// for each electron!!!
//   This is slow!)
//=============================================================================
unsigned int
AsgForwardElectronLikelihoodTool::getNPrimVertices(
  const EventContext& ctx) const
{
  unsigned int nVtx(0);
  SG::ReadHandle<xAOD::VertexContainer> vtxCont(m_primVtxContKey, ctx);
  if (!vtxCont.isValid()) {
    ATH_MSG_WARNING("Cannot find " << m_primVtxContKey.key()
            << " container, returning default nVtx");
    return m_nPVdefault;
  }
  for (const auto *vxcand : *vtxCont) {
    if (vxcand->nTrackParticles() >= 2)
      nVtx++;
  }
  return nVtx;
}