GNN_DataStorage.cxx

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/*
  Copyright (C) 2002-2024 CERN for the benefit of the ATLAS collaboration
*/
 
#include "TrigInDetEvent/TrigSiSpacePointBase.h"
#include "InDetPrepRawData/PixelCluster.h"
#include "TrigInDetPattRecoEvent/TrigInDetSiLayer.h"
#include "TrigInDetPattRecoTools/GNN_Geometry.h"
#include "GNN_DataStorage.h"
 
#include<cmath>
#include<cstring>
#include<algorithm>
 
TrigFTF_GNN_EtaBin::TrigFTF_GNN_EtaBin() {
  m_in.clear();
  m_vn.clear();
  m_params.clear();
}
 
TrigFTF_GNN_EtaBin::~TrigFTF_GNN_EtaBin() {
  m_in.clear();
  m_vn.clear();
  m_params.clear();
}
 
void TrigFTF_GNN_EtaBin::sortByPhi() {
  std::sort(m_vn.begin(), m_vn.end(), TrigFTF_GNN_EtaBin::CompareByPhi());
}
 
void TrigFTF_GNN_EtaBin::initializeNodes() {
 
  m_params.resize(m_vn.size());
  m_in.resize(m_vn.size());
  
  for(unsigned int nIdx=0;nIdx<m_vn.size();nIdx++) {
    m_in[nIdx].reserve(50);//reasonably high number of incoming edges per node
    m_params[nIdx][0] = -100.0;//default cut on cot(theta)
    m_params[nIdx][1] = 100.0; //default cut on cot(theta)
    m_params[nIdx][2] = m_vn[nIdx]->phi();
    m_params[nIdx][3] = m_vn[nIdx]->r();
    m_params[nIdx][4] = m_vn[nIdx]->z();
  }
}
 
void TrigFTF_GNN_EtaBin::generatePhiIndexing(float dphi) {
  
  for(unsigned int nIdx=0;nIdx<m_vn.size();nIdx++) {
 
    float phi = m_params[nIdx][2];
    if(phi <= M_PI-dphi) continue;    
    m_vPhiNodes.push_back(std::pair<float, unsigned int>(phi - 2*M_PI, nIdx));
    
  }
 
  for(unsigned int nIdx=0;nIdx<m_vn.size();nIdx++) {
    float phi = m_params[nIdx][2];
    m_vPhiNodes.push_back(std::pair<float, unsigned int>(phi, nIdx));
  }
 
  for(unsigned int nIdx=0;nIdx<m_vn.size();nIdx++) {
 
    float phi = m_params[nIdx][2];
    if(phi >= -M_PI + dphi) break;
    m_vPhiNodes.push_back(std::pair<float, unsigned int>(phi + 2*M_PI, nIdx));
  }
}
 
TrigFTF_GNN_DataStorage::TrigFTF_GNN_DataStorage(const TrigFTF_GNN_Geometry& g) : m_geo(g) {
  m_etaBins.resize(g.num_bins());
}
 
TrigFTF_GNN_DataStorage::~TrigFTF_GNN_DataStorage() {}
 
int TrigFTF_GNN_DataStorage::addSpacePoint(const TrigSiSpacePointBase* sp, bool useML = false) {
 
  const TrigFTF_GNN_Layer* pL = m_geo.getTrigFTF_GNN_LayerByIndex(sp->layer());
 
  if(pL==nullptr) return -1;
 
  int binIndex = pL->getEtaBin(sp->z(), sp->r());
 
  if(binIndex == -1) {
    return -2;
  }
 
  bool isStrip = sp->offlineSpacePoint()->clusterList().second != nullptr;
 
  if(isStrip) {
    m_etaBins.at(binIndex).m_vn.push_back(sp);
    return 0;
  }
 
  bool isBarrel = (pL->m_layer.m_type == 0);
 
  if(isBarrel) {
    m_etaBins.at(binIndex).m_vn.push_back(sp);
  }
  else {
    if (useML) {
      const Trk::SpacePoint* osp = sp->offlineSpacePoint();
      const InDet::PixelCluster* pCL = dynamic_cast<const InDet::PixelCluster*>(osp->clusterList().first);
      float cluster_width = pCL->width().widthPhiRZ().y();
      if(cluster_width > 0.2) return -3;
    }
    m_etaBins.at(binIndex).m_vn.push_back(sp);
    
  }
 
  return 0;
}
 
unsigned int TrigFTF_GNN_DataStorage::numberOfNodes() const {
 
  unsigned int n=0;
  
  for(auto& b : m_etaBins) {
    n += b.m_vn.size();
  }
  return n;
}
 
void TrigFTF_GNN_DataStorage::sortByPhi() {
  for(auto& b : m_etaBins) b.sortByPhi();
}
 
void TrigFTF_GNN_DataStorage::initializeNodes(bool useML = false) {
  for(auto& b : m_etaBins) {
    b.initializeNodes();
  }
  
  if(!useML) return;
 
  unsigned int nL = m_geo.num_layers();
 
  for(unsigned int layerIdx=0;layerIdx<nL;layerIdx++) {
 
    const TrigFTF_GNN_Layer* pL = m_geo.getTrigFTF_GNN_LayerByIndex(layerIdx);
 
    if(pL->m_layer.m_subdet < 20000) {//skip strips volumes: layers in range [1200X-1400X]
      continue;
    }
    
    bool isBarrel = (pL->m_layer.m_type == 0);
 
    if(!isBarrel) continue;
 
    int nBins = pL->m_bins.size();
 
    for(int b=0;b<nBins;b++) {//loop over eta-bins in Layer
 
      TrigFTF_GNN_EtaBin& B = m_etaBins.at(pL->m_bins.at(b));
 
      if(B.empty()) continue;
      
      for(unsigned int nIdx=0;nIdx<B.m_vn.size();nIdx++) {
        
        const Trk::SpacePoint* osp = B.m_vn[nIdx]->offlineSpacePoint();
        const InDet::PixelCluster* pCL = dynamic_cast<const InDet::PixelCluster*>(osp->clusterList().first);
 
        float cluster_width = pCL->width().widthPhiRZ().y();
    //adjusting cuts using fitted boundaries of |cot(theta)| vs. cluster z-width distribution 
        float min_tau = 6.7*(cluster_width - 0.2);//linear fit
        float max_tau = 1.6 + 0.15/(cluster_width + 0.2) + 6.1*(cluster_width - 0.2);//linear fit + correction for short clusters
 
        B.m_params[nIdx][0] = min_tau;
        B.m_params[nIdx][1] = max_tau;
        
      }
    }
  }
}
 
void TrigFTF_GNN_DataStorage::generatePhiIndexing(float dphi) {
  for(auto& b : m_etaBins) b.generatePhiIndexing(dphi);
}