DNNCaloSimSvc.cxx

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/*
  Copyright (C) 2002-2024 CERN for the benefit of the ATLAS collaboration
*/
 
// DNNCaloSimSvc.cxx, (c) ATLAS Detector software             //
 
// class header include
#include "DNNCaloSimSvc.h"
 
 
// FastCaloSim includes
#include "ISF_FastCaloSimEvent/TFCSParametrizationBase.h"
#include "ISF_FastCaloSimEvent/TFCSSimulationState.h"
#include "ISF_FastCaloSimEvent/TFCSTruthState.h"
#include "ISF_FastCaloSimEvent/TFCSExtrapolationState.h"
#include "ISF_FastCaloSimParametrization/CaloGeometryFromCaloDDM.h"
#include "ISF_FastCaloSimEvent/FastCaloSim_CaloCell_ID.h"
 
//calculators
#include "CaloGeoHelpers/CaloPhiRange.h"
 
#include "AtlasDetDescr/AtlasDetectorID.h"
#include "IdDictParser/IdDictParser.h"
#include "CaloIdentifier/LArEM_ID.h"
#include "CaloIdentifier/TileID.h"
 
// StoreGate
#include "StoreGate/StoreGateSvc.h"
 
#include "CaloDetDescr/CaloDetDescrElement.h"
#include "CaloDetDescr/CaloDetDescrManager.h"
#include "CaloIdentifier/CaloIdManager.h"
#include "CaloDetDescrUtils/CaloDetDescrBuilder.h"
#include "AthenaKernel/getMessageSvc.h"
#include "LArReadoutGeometry/FCALDetectorManager.h"
 
#include "PathResolver/PathResolver.h"
 
#include "lwtnn/parse_json.hh"
 
#include "TFile.h"
#include <fstream>
#include "CLHEP/Random/RandGaussZiggurat.h"
#include "CLHEP/Random/RandFlat.h"
#include "CLHEP/Units/SystemOfUnits.h"
 
using std::abs;
using std::atan2;
 
ISF::DNNCaloSimSvc::DNNCaloSimSvc(const std::string& name, ISvcLocator* svc) :
  BaseSimulationSvc(name, svc),
  m_graph(nullptr),
  m_theContainer(nullptr),
  m_rndGenSvc("AtRndmGenSvc", name),
  m_randomEngine(nullptr),
  m_caloDetDescrManager(nullptr),
  m_caloGeo(nullptr)
{
  declareProperty("ParamsInputFilename"            ,       m_paramsFilename="DNNCaloSim/DNNCaloSim_GAN_nn_v0.json"," lwtnn json output describing the trained network");
  declareProperty("ParamsInputArchitecture"        ,       m_paramsInputArchitecture="GANv0","tag describing additional parameters necessary for the network");
  declareProperty("CaloCellsOutputName"            ,       m_caloCellsOutputName) ;
  declareProperty("CaloCellMakerTools_setup"       ,       m_caloCellMakerToolsSetup) ;
  declareProperty("CaloCellMakerTools_release"     ,       m_caloCellMakerToolsRelease) ;
  declareProperty("RandomSvc"                      ,       m_rndGenSvc                );
  declareProperty("RandomStream"                   ,       m_randomEngineName         );
  declareProperty("FastCaloSimCaloExtrapolation"   ,       m_FastCaloSimCaloExtrapolation );
 
}
 
ISF::DNNCaloSimSvc::~DNNCaloSimSvc()
= default;
 
StatusCode ISF::DNNCaloSimSvc::initialize()
{
 
  ATH_MSG_INFO(m_screenOutputPrefix << "Initializing ...");
 
  ATH_CHECK(m_rndGenSvc.retrieve());
  m_randomEngine = m_rndGenSvc->GetEngine( m_randomEngineName);
  if (!m_randomEngine)
    {
      ATH_MSG_ERROR("Could not get random number engine from RandomNumberService. Abort.");
      return StatusCode::FAILURE;
    }
 
  m_caloDetDescrManager = detStore()->tryConstRetrieve<CaloDetDescrManager>(caloMgrStaticKey);
  if (!m_caloDetDescrManager) {
    std::unique_ptr<CaloDetDescrManager> caloMgrPtr = buildCaloDetDescrNoAlign(serviceLocator()
                                                                               , Athena::getMessageSvc());
    ATH_CHECK(detStore()->record(std::move(caloMgrPtr), caloMgrStaticKey));
    ATH_CHECK(detStore()->retrieve(m_caloDetDescrManager, caloMgrStaticKey));
    if (!m_caloDetDescrManager) {
      ATH_MSG_ERROR ("Failed to build CaloDetDescrManager.");
      return StatusCode::FAILURE;
    }
  }
  const FCALDetectorManager * fcalManager=nullptr;
  ATH_CHECK(detStore()->retrieve(fcalManager));
 
  const CaloIdManager* caloId_mgr = m_caloDetDescrManager->getCalo_Mgr();
  m_emID = caloId_mgr->getEM_ID();
 
  m_caloGeo = std::make_unique<CaloGeometryFromCaloDDM>();
  m_caloGeo->LoadGeometryFromCaloDDM(m_caloDetDescrManager);
  if(!m_caloGeo->LoadFCalChannelMapFromFCalDDM(fcalManager) )ATH_MSG_FATAL("Found inconsistency between FCal_Channel map and GEO file. Please, check if they are configured properly.");
 
 
  // initialize DNN 
  if (initializeNetwork().isFailure())
    {
      ATH_MSG_ERROR("Could not initialize network ");
      return StatusCode::FAILURE;
 
    }
 
  
  // Get FastCaloSimCaloExtrapolation
  if(m_FastCaloSimCaloExtrapolation.retrieve().isFailure())
    {
      ATH_MSG_ERROR("FastCaloSimCaloExtrapolation not found ");
      return StatusCode::FAILURE;
    }
 
  m_windowCells.reserve(m_numberOfCellsForDNN);
  
 
 
  return StatusCode::SUCCESS;
}
 
// initialize lwtnn network 
StatusCode ISF::DNNCaloSimSvc::initializeNetwork()
{
 
 
 
  // get neural net JSON file as an std::istream object
  std::string inputFile=PathResolverFindCalibFile(m_paramsFilename);
  if (inputFile.empty()){
    ATH_MSG_ERROR("Could not find json file " << m_paramsFilename );
    return StatusCode::FAILURE;
  } 
 
 
 
  ATH_MSG_INFO("Using json file " << inputFile );
  std::ifstream input(inputFile);
  // build the graph
  m_graph=std::make_unique<lwt::LightweightGraph>(lwt::parse_json_graph(input) );
  if (m_graph==nullptr){
    ATH_MSG_ERROR("Could not create LightWeightGraph from  " << m_paramsFilename );
    return StatusCode::FAILURE;
  }
 
 
 
  // initialize all necessary constants
  // FIXME eventually all these could be stored in the .json file
 
  ATH_MSG_INFO("Using ParamsInputArchitecture: " << m_paramsInputArchitecture );
  if (m_paramsInputArchitecture=="GANv0") // GAN then VAE etc...
    {
      m_GANLatentSize = 300;
      m_logTrueEnergyMean = 9.70406053;
      m_logTrueEnergyScale = 1.76099569;
      m_riImpactEtaMean = 3.47603256e-05;
      m_riImpactEtaScale = 0.00722316;
      m_riImpactPhiMean = -5.42153684e-05;
      m_riImpactPhiScale = 0.00708241;
    }
 
  if (m_GANLatentSize==0){
    ATH_MSG_ERROR("m_GANLatentSize uninitialized!.ParamsInputArchitecture= " << m_paramsInputArchitecture );
    return StatusCode::FAILURE;
  }
 
  return StatusCode::SUCCESS;
}
 
StatusCode ISF::DNNCaloSimSvc::finalize()
{
  ATH_MSG_INFO(m_screenOutputPrefix << "Finalizing ...");
  return StatusCode::SUCCESS;
}
 
StatusCode ISF::DNNCaloSimSvc::setupEvent()
{
  const EventContext& ctx = Gaudi::Hive::currentContext();
  ATH_MSG_INFO(m_screenOutputPrefix << "setupEvent NEW EVENT! ");
 
  m_theContainer = new CaloCellContainer(SG::VIEW_ELEMENTS);
 
  StatusCode sc = evtStore()->record(m_theContainer, m_caloCellsOutputName);
  if (sc.isFailure())
    {
      ATH_MSG_FATAL( m_screenOutputPrefix << "cannot record CaloCellContainer " << m_caloCellsOutputName );
      return StatusCode::FAILURE;
    }
 
  //FIXME why retrieve every event ?
  CHECK( m_caloCellMakerToolsSetup.retrieve() );
  ATH_MSG_DEBUG( "Successfully retrieve CaloCellMakerTools: " << m_caloCellMakerToolsSetup );
  ToolHandleArray<ICaloCellMakerTool>::iterator itrTool = m_caloCellMakerToolsSetup.begin();
  ToolHandleArray<ICaloCellMakerTool>::iterator endTool = m_caloCellMakerToolsSetup.end();
  for (; itrTool != endTool; ++itrTool)
    {
      std::string chronoName=this->name()+"_"+ itrTool->name();
      if (m_chrono) m_chrono->chronoStart(chronoName);
      StatusCode sc = (*itrTool)->process(m_theContainer, ctx);
      if (m_chrono) {
    m_chrono->chronoStop(chronoName);
    ATH_MSG_DEBUG( m_screenOutputPrefix << "Chrono stop : delta " << m_chrono->chronoDelta (chronoName,IChronoStatSvc::USER) * CLHEP::microsecond / CLHEP::second << " second " );
      }
 
      if (sc.isFailure())
    {
      ATH_MSG_ERROR( m_screenOutputPrefix << "Error executing tool " << itrTool->name() );
      return StatusCode::FAILURE;
    }
    }
 
 
  // FIXME just for debugging
  // exercise window building 
  // should be false by default 
  // careful:if enabled change the random number sequence !
  if (false){
    TFCSSimulationState testsimulstate(m_randomEngine);
    const CaloDetDescrElement * testImpactCellDDE;
    const int ntrial=100;
    ATH_MSG_INFO ("Trial window building on " << ntrial << " dummy eta phi " );
    for (int i=0 ; i< ntrial ; i++){
      const double eta = CLHEP::RandFlat::shoot(testsimulstate.randomEngine(), 0.2, 0.25);
      const double phi = CLHEP::RandFlat::shoot(testsimulstate.randomEngine(), -CLHEP::pi , CLHEP::pi);
      
      //randomise eta, phi
      if (fillWindowCells(eta,phi,testImpactCellDDE).isFailure()){
      ATH_MSG_WARNING("Could not build trial window cells vector with eta " << eta << " phi " << phi);
      }
    }
    ATH_MSG_INFO ("End of trial window building on " << ntrial << " dummy eta phi " );
    
  }
 
 
 
 
  return StatusCode::SUCCESS;
}
 
StatusCode ISF::DNNCaloSimSvc::releaseEvent()
{
  const EventContext& ctx = Gaudi::Hive::currentContext();
  ATH_MSG_VERBOSE(m_screenOutputPrefix << "release Event");
 
  CHECK( m_caloCellMakerToolsRelease.retrieve() );
 
  //run release tools in a loop
  ToolHandleArray<ICaloCellMakerTool>::iterator itrTool = m_caloCellMakerToolsRelease.begin();
  ToolHandleArray<ICaloCellMakerTool>::iterator endTool = m_caloCellMakerToolsRelease.end();
  for (; itrTool != endTool; ++itrTool)
    {
      ATH_MSG_VERBOSE( m_screenOutputPrefix << "Calling tool " << itrTool->name() );
  
      StatusCode sc = (*itrTool)->process(m_theContainer, ctx);
  
      if (sc.isFailure())
    {
      ATH_MSG_ERROR( m_screenOutputPrefix << "Error executing tool " << itrTool->name() );
    }
    }
 
  return StatusCode::SUCCESS;
 
}
bool compCellsForDNNSortMirror(const CaloCell* a, const CaloCell* b)
{
  CaloCell_ID::CaloSample aSampling = a->caloDDE()->getSampling();
  CaloCell_ID::CaloSample bSampling = b->caloDDE()->getSampling();
 
  float aEtaRaw = a->caloDDE()->eta_raw();
  float bEtaRaw = b->caloDDE()->eta_raw();
 
  float aPhiRaw = a->caloDDE()->phi_raw();
  float bPhiRaw = b->caloDDE()->phi_raw();
 
  if ((aSampling) < (bSampling))
    return true;
  else if ((aSampling) > (bSampling))
    return false;
  // reverse sort in eta for left half of detector
  if ((aEtaRaw) < (bEtaRaw))
    return false;
  else if ((aEtaRaw) > (bEtaRaw))
    return true;
 
  return CaloPhiRange::diff(aPhiRaw, bPhiRaw) <= 0;
}
 
bool compCellsForDNNSort(const CaloCell* a, const CaloCell* b)
{
  CaloCell_ID::CaloSample aSampling = a->caloDDE()->getSampling();
  CaloCell_ID::CaloSample bSampling = b->caloDDE()->getSampling();
 
  float aEtaRaw = a->caloDDE()->eta_raw();
  float bEtaRaw = b->caloDDE()->eta_raw();
 
  float aPhiRaw = a->caloDDE()->phi_raw();
  float bPhiRaw = b->caloDDE()->phi_raw();
 
  if ((aSampling) < (bSampling))
    return true;
  else if ((aSampling) > (bSampling))
    return false;
 
  if ((aEtaRaw) < (bEtaRaw))
    return true;
  else if ((aEtaRaw) > (bEtaRaw))
    return false;
 
return CaloPhiRange::diff(aPhiRaw, bPhiRaw) <= 0;
}
 
StatusCode ISF::DNNCaloSimSvc::simulate(ISF::ISFParticle& isfp, McEventCollection*)
{
 
  ATH_MSG_VERBOSE("NEW PARTICLE! DNNCaloSimSvc called with ISFParticle: " << isfp);
 
 
  //Don't simulate particles with total energy below 10 MeV
  if(isfp.ekin() < 10) {
    ATH_MSG_VERBOSE("Skipping particle with Ekin: " << isfp.ekin() <<" MeV. Below the 10 MeV threshold.");
    return StatusCode::SUCCESS;
  }
 
 
  //Compute all inputs to the network
  NetworkInputs inputs;
  double trueEnergy;
  if (fillNetworkInputs(isfp,inputs,trueEnergy).isFailure()) {
    ATH_MSG_WARNING("Could not initialize network ");
    // bail out but do not stop the job
    return StatusCode::SUCCESS;
  }
 
 
  // compute the network output values
  ATH_MSG_VERBOSE("neural network input = "<<inputs);
  NetworkOutputs outputs = m_graph->compute(inputs);
  ATH_MSG_VERBOSE("neural network output = "<<outputs);
 
 
  // add network output energy in the right place in the calorimeter
  int itr = 0;
  for ( auto & windowCell : m_windowCells) {
    windowCell->addEnergy(trueEnergy * outputs[std::to_string(itr)]);
    itr++;
 
    ATH_MSG_VERBOSE(" cell eta_raw " << windowCell->caloDDE()->eta_raw() 
            << " phi_raw " << windowCell->caloDDE()->phi_raw() 
            << " sampling " << windowCell->caloDDE()->getSampling() 
            << " energy " << windowCell->energy());
  }
 
 
 
 
  
  return StatusCode::SUCCESS;
}
 
 
 
// compute all the necessary inputs to the network
StatusCode ISF::DNNCaloSimSvc::fillNetworkInputs(const ISF::ISFParticle& isfp, NetworkInputs & inputs, double & trueEnergy)
{
  Amg::Vector3D particle_position =  isfp.position();  
  Amg::Vector3D particle_direction(isfp.momentum().x(),isfp.momentum().y(),isfp.momentum().z());
  
 
  TFCSTruthState truth(isfp.momentum().x(),isfp.momentum().y(),isfp.momentum().z(),sqrt(isfp.momentum().mag2()+pow(isfp.mass(),2)),isfp.pdgCode());
  truth.set_vertex(particle_position[Amg::x], particle_position[Amg::y], particle_position[Amg::z]);
 
  trueEnergy = isfp.ekin();
 
 
  TFCSExtrapolationState extrapol;
  //FIXME this is extrapolating to many layers, when we only need middle layer middle surface
  //FIXME could have dedicated extrapolation to save time 
  m_FastCaloSimCaloExtrapolation->extrapolate(extrapol,&truth);
  //  extrapol.Print();
 
 
  if (false)
    {
      for (int isam=0; isam< CaloCell_ID_FCS::MaxSample ; isam++){
    //enum SUBPOS { SUBPOS_MID = 0, SUBPOS_ENT = 1, SUBPOS_EXT = 2}; //MID=middle, ENT=entrance, EXT=exit of cal layer
 
    for (int isubpos=0; isubpos< 3 ; isubpos++){
      
      ATH_MSG_VERBOSE("EXTRAPO isam=" << isam <<
              " isubpos=" << isubpos <<
              " OK="    << extrapol.OK(isam,isubpos) <<
              " eta="  << extrapol.eta(isam,isubpos) <<
              " phi="  << extrapol.phi(isam,isubpos) <<
              " r="  << extrapol.r(isam,isubpos) );
 
    }
      }
    }
 
  //FIXME deal with endcap as well 
  int isam=CaloCell_ID_FCS::EMB2;
  int isubpos=SUBPOS_ENT;
  double etaExtrap=-999.;
  double phiExtrap=-999.;
  if (extrapol.eta(isam,isubpos)) {
    etaExtrap=extrapol.eta(isam,isubpos);
    phiExtrap=extrapol.phi(isam,isubpos);
  }
 
  ATH_MSG_VERBOSE("Will use isam=" << isam <<
          " isubpos=" << isubpos <<
          " eta="  << etaExtrap << 
          " phi="  << phiExtrap );
 
 
 
  // fill vector of cells, and DDE of middle cell
  const CaloDetDescrElement * impactCellDDE;
  if (fillWindowCells(etaExtrap,phiExtrap,impactCellDDE).isFailure()){
    ATH_MSG_WARNING("Could not build window cells vector ");
    return StatusCode::FAILURE;
  }
 
 
  // start neural network part
  // fill a map of input nodes
  // this is for GAN
  // most likely it should be specialised as a function of m_ParamsInputArchitecture
 
  double randGaussz = 0.;
 
 
  int impactEtaIndex = m_emID->eta(impactCellDDE->identify());
  int impactPhiIndex = m_emID->phi(impactCellDDE->identify());
  double etaRawImpactCell=impactCellDDE->eta_raw();
  double phiRawImpactCell=impactCellDDE->phi_raw();
 
  ATH_MSG_VERBOSE("impact eta_index " << impactEtaIndex 
          << " phi_index " <<  impactPhiIndex  
          << " sampling " << m_emID->sampling(impactCellDDE->identify()));
 
  int pconf = impactPhiIndex % 4 ;
  int econf = (impactEtaIndex + 1) % 2 ; // ofset corresponds to difference in index calculated for neural net preprocessing
 
  double riImpactEta = (etaExtrap - etaRawImpactCell);
  // mirror for left half
  if (etaExtrap < 0){
    riImpactEta *= -1.;
 
  }
  // scale & centre
  riImpactEta = (riImpactEta - m_riImpactEtaMean)/m_riImpactEtaScale;
  double riImpactPhi = (CaloPhiRange::diff(phiExtrap, phiRawImpactCell) - m_riImpactPhiMean)/m_riImpactPhiScale;
 
 
  // fill randomize latent space
  TFCSSimulationState simulstate(m_randomEngine);
 
  //FIXME generate in one go
  for (int i = 0; i< m_GANLatentSize; i ++)
    {
      randGaussz = CLHEP::RandGaussZiggurat::shoot(simulstate.randomEngine(), 0., 1.);
      inputs["Z"].insert ( std::pair<std::string,double>(std::to_string(i), randGaussz) );
 
    }
 
  // fill preprocessed true energy
  inputs["E_true"].insert ( std::pair<std::string,double>("0", (std::log(trueEnergy) - m_logTrueEnergyMean)/m_logTrueEnergyScale) );
  // fill p,e configurations multi-hot vector
  for (int i = 0; i< 4; i ++)
    {
      if (i == pconf){
    inputs["pconfig"].insert ( std::pair<std::string,double>(std::to_string(i),1.) );
      }
      else{
    inputs["pconfig"].insert ( std::pair<std::string,double>(std::to_string(i),0.) );
      }
    }
  for (int i = 0; i< 2; i ++){
    if (i == econf){
      inputs["econfig"].insert ( std::pair<std::string,double>(std::to_string(i),1.) );
    }
    else{
      inputs["econfig"].insert ( std::pair<std::string,double>(std::to_string(i),0.) );
    }
  }
  // fill position of extrap particle in impact cell
  inputs["ripos"].insert ( std::pair<std::string,double>("0", riImpactEta) ); 
  inputs["ripos"].insert ( std::pair<std::string,double>("1", riImpactPhi ) );
 
  return StatusCode::SUCCESS;
}
 
 
StatusCode ISF::DNNCaloSimSvc::fillWindowCells(const double etaExtrap,const double phiExtrap,const CaloDetDescrElement* & impactCellDDE) {
  
  //now find the cell it corresponds to  
  //FIXME this is barrel should also look in endcap 
  // (note that is really looking up eta, phi, not raw eta phi
  impactCellDDE=m_caloDetDescrManager->get_element(CaloCell_ID::EMB2,etaExtrap,phiExtrap);
  if (impactCellDDE==nullptr){
    ATH_MSG_WARNING("No cell found for this eta " << etaExtrap << " phi " << phiExtrap);
    return StatusCode::FAILURE;
  }
 
 
 
 
  const int caloHashImpactCell=impactCellDDE->calo_hash();
  const double etaImpactCell=impactCellDDE->eta();
  const double phiImpactCell=impactCellDDE->phi();
  const double etaRawImpactCell=impactCellDDE->eta_raw();
  const double phiRawImpactCell=impactCellDDE->phi_raw();
 
 
  ATH_MSG_VERBOSE("impact cell calohash=" << caloHashImpactCell <<
          " eta="  << etaImpactCell << 
          " phi="  << phiImpactCell <<
          " eta raw="  << etaRawImpactCell << 
          " phi raw="  << phiRawImpactCell );
 
 
  int nSqCuts = 0;
 
 
  // select the cells DNN will simulate 
  // note that m_theCellContainer has all the calorimeter cells
  // this will hold the list of cells to simulate
  //FIXME this can be sped up certainly
  m_windowCells.clear();
  CaloCell_ID::CaloSample sampling;
  float eta_raw;
  float phi_raw;
  for(CaloCell* theCell : * m_theContainer) {
    sampling = theCell->caloDDE()->getSampling();
    eta_raw = theCell->caloDDE()->eta_raw();
    phi_raw = theCell->caloDDE()->phi_raw();
    if (( eta_raw < etaRawImpactCell + m_etaRawBackCut) && (eta_raw > etaRawImpactCell - m_etaRawBackCut)) {
      if ((CaloPhiRange::diff(phi_raw, phiRawImpactCell) < m_phiRawStripCut ) && (CaloPhiRange::diff(phi_raw, phiRawImpactCell) > - m_phiRawStripCut) ) {
 
      }
      else{
        continue;
      }
    }
    else{
      continue;
    }
 
    if ((sampling == 0) || (sampling == 1) ){
      if ((eta_raw < etaRawImpactCell + m_etaRawMiddleCut) && (eta_raw > etaRawImpactCell - m_etaRawMiddleCut)) {
           nSqCuts ++;
        // add to vector
        m_windowCells.push_back(theCell);
    
      }
    }
    else if(sampling == 2) {
      if ((CaloPhiRange::diff(phi_raw , phiRawImpactCell) < m_phiRawMiddleCut) && (CaloPhiRange::diff(phi_raw, phiRawImpactCell) > - m_phiRawMiddleCut)) {
           if ((eta_raw < etaRawImpactCell + m_etaRawMiddleCut) && (eta_raw > etaRawImpactCell - m_etaRawMiddleCut)) {
             nSqCuts ++;
             m_windowCells.push_back(theCell);
           }
      }
    }
 
    else if(sampling == 3){
      if ((CaloPhiRange::diff(phi_raw, phiRawImpactCell) <  m_phiRawMiddleCut) && (CaloPhiRange::diff(phi_raw , phiRawImpactCell) > - m_phiRawMiddleCut )) {
        nSqCuts ++;
        m_windowCells.push_back(theCell);
      }
 
    }
  }
 
  if (nSqCuts != m_numberOfCellsForDNN){
    ATH_MSG_WARNING("Total cells passing DNN selection is " << nSqCuts << " but should be " << m_numberOfCellsForDNN );
    // bail out, but do not stop the job
    return StatusCode::FAILURE;
 
  }
 
  //sort cells within the cluster like they are fed to DNN
  if (etaRawImpactCell < 0){
    std::sort(m_windowCells.begin(), m_windowCells.end(), &compCellsForDNNSortMirror);
  }
  else{
    std::sort(m_windowCells.begin(), m_windowCells.end(), &compCellsForDNNSort);
  }
 
  return StatusCode::SUCCESS;
 
}