DTCombinatorialExtendedPatternReco.cc

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/* This Class Header */
#include "RecoLocalMuon/DTSegment/src/DTCombinatorialExtendedPatternReco.h"
 
/* Collaborating Class Header */
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "DataFormats/Common/interface/OwnVector.h"
#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "Geometry/Records/interface/MuonGeometryRecord.h"
#include "Geometry/DTGeometry/interface/DTGeometry.h"
#include "Geometry/DTGeometry/interface/DTLayer.h"
#include "Geometry/DTGeometry/interface/DTSuperLayer.h"
#include "DataFormats/DTRecHit/interface/DTSLRecSegment2D.h"
#include "RecoLocalMuon/DTSegment/src/DTSegmentUpdator.h"
#include "RecoLocalMuon/DTSegment/src/DTSegmentCleaner.h"
#include "RecoLocalMuon/DTSegment/src/DTHitPairForFit.h"
#include "RecoLocalMuon/DTSegment/src/DTSegmentCand.h"
#include "RecoLocalMuon/DTSegment/src/DTSegmentExtendedCand.h"
 
/* C++ Headers */
#include <iterator>
using namespace std;
#include "FWCore/ParameterSet/interface/ParameterSet.h"
 
/* ====================================================================== */
 
DTCombinatorialExtendedPatternReco::DTCombinatorialExtendedPatternReco(const edm::ParameterSet& pset)
    : DTRecSegment2DBaseAlgo(pset), theAlgoName("DTCombinatorialExtendedPatternReco") {
  theMaxAllowedHits = pset.getParameter<unsigned int>("MaxAllowedHits");  // 100
  theAlphaMaxTheta = pset.getParameter<double>("AlphaMaxTheta");          // 0.1 ;
  theAlphaMaxPhi = pset.getParameter<double>("AlphaMaxPhi");              // 1.0 ;
  debug = pset.getUntrackedParameter<bool>("debug");                      //true;
  theUpdator = new DTSegmentUpdator(pset);
  theCleaner = new DTSegmentCleaner(pset);
  string theHitAlgoName = pset.getParameter<string>("recAlgo");
  usePairs = !(theHitAlgoName == "DTNoDriftAlgo");
}
 
DTCombinatorialExtendedPatternReco::~DTCombinatorialExtendedPatternReco() {}
 
/* Operations */
edm::OwnVector<DTSLRecSegment2D> DTCombinatorialExtendedPatternReco::reconstruct(
    const DTSuperLayer* sl, const std::vector<DTRecHit1DPair>& pairs) {
  if (debug)
    cout << "DTCombinatorialExtendedPatternReco::reconstruct" << endl;
  theTriedPattern.clear();
  edm::OwnVector<DTSLRecSegment2D> result;
  vector<std::shared_ptr<DTHitPairForFit>> hitsForFit = initHits(sl, pairs);
 
  vector<DTSegmentCand*> candidates = buildSegments(sl, hitsForFit);
 
  vector<DTSegmentCand*>::const_iterator cand = candidates.begin();
  while (cand < candidates.end()) {
    DTSLRecSegment2D* segment = (**cand);
 
    theUpdator->update(segment, false);
 
    result.push_back(segment);
 
    if (debug) {
      cout << "Reconstructed 2D extended segments " << result.back() << endl;
    }
 
    delete *(cand++);  // delete the candidate!
  }
 
  return result;
}
 
void DTCombinatorialExtendedPatternReco::setES(const edm::EventSetup& setup) {
  // Get the DT Geometry
  setup.get<MuonGeometryRecord>().get(theDTGeometry);
  theUpdator->setES(setup);
}
 
void DTCombinatorialExtendedPatternReco::setClusters(const vector<DTSLRecCluster>& clusters) { theClusters = clusters; }
 
vector<std::shared_ptr<DTHitPairForFit>> DTCombinatorialExtendedPatternReco::initHits(
    const DTSuperLayer* sl, const std::vector<DTRecHit1DPair>& hits) {
  vector<std::shared_ptr<DTHitPairForFit>> result;
  for (vector<DTRecHit1DPair>::const_iterator hit = hits.begin(); hit != hits.end(); ++hit) {
    result.push_back(std::make_shared<DTHitPairForFit>(*hit, *sl, theDTGeometry));
  }
  return result;
}
 
vector<DTSegmentCand*> DTCombinatorialExtendedPatternReco::buildSegments(
    const DTSuperLayer* sl, const std::vector<std::shared_ptr<DTHitPairForFit>>& hits) {
  typedef vector<std::shared_ptr<DTHitPairForFit>> hitCont;
  typedef hitCont::const_iterator hitIter;
  vector<DTSegmentCand*> result;
 
  if (debug) {
    cout << "DTCombinatorialExtendedPatternReco::buildSegments: " << sl->id() << " nHits " << hits.size() << endl;
    for (vector<std::shared_ptr<DTHitPairForFit>>::const_iterator hit = hits.begin(); hit != hits.end(); ++hit)
      cout << **hit << endl;
  }
 
  // 10-Mar-2004 SL
  // put a protection against heavily populated chambers, for which the segment
  // building could lead to infinite memory usage...
  if (hits.size() > theMaxAllowedHits) {
    if (debug) {
      cout << "Warning: this SuperLayer " << sl->id() << " has too many hits : " << hits.size() << " max allowed is "
           << theMaxAllowedHits << endl;
      cout << "Skipping segment reconstruction... " << endl;
    }
    return result;
  }
 
  //  compatible with them
  for (hitCont::const_iterator firstHit = hits.begin(); firstHit != hits.end(); ++firstHit) {
    for (hitCont::const_reverse_iterator lastHit = hits.rbegin(); (*lastHit) != (*firstHit); ++lastHit) {
      // hits must nor in the same nor in adiacent layers
      if (fabs((*lastHit)->id().layerId() - (*firstHit)->id().layerId()) <= 1)
        continue;
      if (debug) {
        cout << "Selected these two hits pair " << endl;
        cout << "First " << *(*firstHit) << " Layer Id: " << (*firstHit)->id().layerId() << endl;
        cout << "Last " << *(*lastHit) << " Layer Id: " << (*lastHit)->id().layerId() << endl;
      }
 
      GlobalPoint IP;
      float DAlphaMax;
      if ((sl->id()).superlayer() == 2)  // Theta SL
        DAlphaMax = theAlphaMaxTheta;
      else  // Phi SL
        DAlphaMax = theAlphaMaxPhi;
 
      DTEnums::DTCellSide codes[2] = {DTEnums::Right, DTEnums::Left};
      for (int firstLR = 0; firstLR < 2; ++firstLR) {
        for (int lastLR = 0; lastLR < 2; ++lastLR) {
          // TODO move the global transformation in the DTHitPairForFit class
          // when it will be moved I will able to remove the sl from the input parameter
          GlobalPoint gposFirst = sl->toGlobal((*firstHit)->localPosition(codes[firstLR]));
          GlobalPoint gposLast = sl->toGlobal((*lastHit)->localPosition(codes[lastLR]));
 
          GlobalVector gvec = gposLast - gposFirst;
          GlobalVector gvecIP = gposLast - IP;
 
          // difference in angle measured
          float DAlpha = fabs(gvec.theta() - gvecIP.theta());
 
          // cout << "DAlpha " << DAlpha << endl;
          if (DAlpha < DAlphaMax) {
            // create a segment hypotesis
            // I don't need a true segment, just direction and position
            LocalPoint posIni = (*firstHit)->localPosition(codes[firstLR]);
            LocalVector dirIni = ((*lastHit)->localPosition(codes[lastLR]) - posIni).unit();
 
            // search for other compatible hits, with or without the L/R solved
            vector<DTSegmentCand::AssPoint> assHits = findCompatibleHits(posIni, dirIni, hits);
            if (debug)
              cout << "compatible hits " << assHits.size() << endl;
 
            // here return an extended candidate (which _has_ the original
            // segment)
            DTSegmentExtendedCand* seg = buildBestSegment(assHits, sl);
 
            if (seg) {
              if (debug)
                cout << "segment " << *seg << endl;
 
              // check if the chi2 and #hits are ok
              if (!seg->good()) {  // good is reimplmented in extended segment
                delete seg;
              } else {
                // remove duplicated segments
                if (checkDoubleCandidates(result, seg)) {
                  // add to the vector of hypotesis
                  // still work with extended segments
                  result.push_back(seg);
                  if (debug)
                    cout << "result is now " << result.size() << endl;
                } else {  // delete it!
                  delete seg;
                  if (debug)
                    cout << "already existing" << endl;
                }
              }
            }
          }
        }
      }
    }
  }
  if (debug) {
    for (vector<DTSegmentCand*>::const_iterator seg = result.begin(); seg != result.end(); ++seg)
      cout << *(*seg) << endl;
  }
 
  // now I have a couple of segment hypotesis, should check for ghost
  // still with extended candidates
  result = theCleaner->clean(result);
  if (debug) {
    cout << "result no ghost  " << result.size() << endl;
    for (vector<DTSegmentCand*>::const_iterator seg = result.begin(); seg != result.end(); ++seg)
      cout << *(*seg) << endl;
  }
 
  // here, finally, I have to return the set of _original_ segments, not the
  // extended ones.
  return result;
}
 
vector<DTSegmentCand::AssPoint> DTCombinatorialExtendedPatternReco::findCompatibleHits(
    const LocalPoint& posIni, const LocalVector& dirIni, const vector<std::shared_ptr<DTHitPairForFit>>& hits) {
  if (debug)
    cout << "Pos: " << posIni << " Dir: " << dirIni << endl;
  vector<DTSegmentCand::AssPoint> result;
 
  // counter to early-avoid double counting in hits pattern
  vector<int> tried;
  int nCompatibleHits = 0;
 
  typedef vector<std::shared_ptr<DTHitPairForFit>> hitCont;
  typedef hitCont::const_iterator hitIter;
  for (hitIter hit = hits.begin(); hit != hits.end(); ++hit) {
    pair<bool, bool> isCompatible = (*hit)->isCompatible(posIni, dirIni);
    if (debug)
      cout << "isCompatible " << isCompatible.first << " " << isCompatible.second << endl;
 
    // if only one of the two is compatible, then the LR is assigned,
    // otherwise is undefined
 
    DTEnums::DTCellSide lrcode;
    if (isCompatible.first && isCompatible.second) {
      usePairs ? lrcode = DTEnums::undefLR : lrcode = DTEnums::Left;  // if not usePairs then only use single side
      tried.push_back(3);
      nCompatibleHits++;
    } else if (isCompatible.first) {
      lrcode = DTEnums::Left;
      tried.push_back(2);
      nCompatibleHits++;
    } else if (isCompatible.second) {
      lrcode = DTEnums::Right;
      tried.push_back(1);
      nCompatibleHits++;
    } else {
      tried.push_back(0);
      continue;  // neither is compatible
    }
    result.push_back(DTSegmentCand::AssPoint(*hit, lrcode));
  }
 
  // check if too few associated hits or pattern already tried
  if (nCompatibleHits < 3 || find(theTriedPattern.begin(), theTriedPattern.end(), tried) == theTriedPattern.end()) {
    theTriedPattern.push_back(tried);
  } else {
    if (debug) {
      vector<vector<int>>::const_iterator t = find(theTriedPattern.begin(), theTriedPattern.end(), tried);
      cout << "Already tried";
      copy((*t).begin(), (*t).end(), ostream_iterator<int>(std::cout));
      cout << endl;
    }
    // empty the result vector
    result.clear();
  }
  return result;
}
 
DTSegmentExtendedCand* DTCombinatorialExtendedPatternReco::buildBestSegment(std::vector<DTSegmentCand::AssPoint>& hits,
                                                                            const DTSuperLayer* sl) {
  if (debug)
    cout << "DTCombinatorialExtendedPatternReco::buildBestSegment " << hits.size() << endl;
  if (hits.size() < 3) {
    //cout << "buildBestSegment: hits " << hits.size()<< endl;
    return nullptr;  // a least 3 point
  }
 
  // hits with defined LR
  vector<DTSegmentCand::AssPoint> points;
 
  // without: I store both L and R, a deque since I need front insertion and
  // deletion
  deque<std::shared_ptr<DTHitPairForFit>> pointsNoLR;
 
  // first add only the hits with LR assigned
  for (vector<DTSegmentCand::AssPoint>::const_iterator hit = hits.begin(); hit != hits.end(); ++hit) {
    if ((*hit).second != DTEnums::undefLR) {
      points.push_back(*hit);
    } else {  // then also for the undef'd one
      pointsNoLR.push_back((*hit).first);
    }
  }
 
  if (debug) {
    cout << "points " << points.size() << endl;
    cout << "pointsNoLR " << pointsNoLR.size() << endl;
  }
 
  // build all possible candidates using L/R ambiguity
  vector<DTSegmentCand*> candidates;
 
  buildPointsCollection(points, pointsNoLR, candidates, sl);
 
  // here I try to add the external clusters and build a set of "extended
  // segment candidate
  vector<DTSegmentExtendedCand*> extendedCands = extendCandidates(candidates, sl);
  if (debug)
    cout << "extended candidates " << extendedCands.size() << endl;
 
  // so now I have build a given number of segments, I should find the best one,
  // by #hits and chi2.
  vector<DTSegmentExtendedCand*>::const_iterator bestCandIter = extendedCands.end();
  double minChi2 = 999999.;
  unsigned int maxNumHits = 0;
  for (vector<DTSegmentExtendedCand*>::const_iterator iter = extendedCands.begin(); iter != extendedCands.end();
       ++iter) {
    if ((*iter)->nHits() == maxNumHits && (*iter)->chi2() < minChi2) {
      minChi2 = (*iter)->chi2();
      bestCandIter = iter;
    } else if ((*iter)->nHits() > maxNumHits) {
      maxNumHits = (*iter)->nHits();
      minChi2 = (*iter)->chi2();
      bestCandIter = iter;
    }
  }
 
  // delete all candidates but the best one!
  for (vector<DTSegmentExtendedCand*>::iterator iter = extendedCands.begin(); iter != extendedCands.end(); ++iter)
    if (iter != bestCandIter)
      delete (*iter);
 
  // return the best candate if any
  if (bestCandIter != extendedCands.end()) {
    return (*bestCandIter);
  }
  return nullptr;
}
 
void DTCombinatorialExtendedPatternReco::buildPointsCollection(vector<DTSegmentCand::AssPoint>& points,
                                                               deque<std::shared_ptr<DTHitPairForFit>>& pointsNoLR,
                                                               vector<DTSegmentCand*>& candidates,
                                                               const DTSuperLayer* sl) {
  if (debug) {
    cout << "DTCombinatorialExtendedPatternReco::buildPointsCollection " << endl;
    cout << "points: " << points.size() << " NOLR: " << pointsNoLR.size() << endl;
  }
  if (!pointsNoLR.empty()) {  // still unassociated points!
    std::shared_ptr<DTHitPairForFit> unassHit = pointsNoLR.front();
    // try with the right
    if (debug)
      cout << "Right hit" << endl;
    points.push_back(DTSegmentCand::AssPoint(unassHit, DTEnums::Right));
    pointsNoLR.pop_front();
    buildPointsCollection(points, pointsNoLR, candidates, sl);
    pointsNoLR.push_front((unassHit));
    points.pop_back();
 
    // try with the left
    if (debug)
      cout << "Left hit" << endl;
    points.push_back(DTSegmentCand::AssPoint(unassHit, DTEnums::Left));
    pointsNoLR.pop_front();
    buildPointsCollection(points, pointsNoLR, candidates, sl);
    pointsNoLR.push_front((unassHit));
    points.pop_back();
  } else {  // all associated
 
    if (debug) {
      cout << "The Hits were" << endl;
      copy(points.begin(), points.end(), ostream_iterator<DTSegmentCand::AssPoint>(std::cout));
      cout << "----" << endl;
      cout << "All associated " << endl;
    }
    DTSegmentCand::AssPointCont pointsSet;
 
    // for (vector<DTSegmentCand::AssPoint>::const_iterator point=points.begin();
    //      point!=points.end(); ++point)
    pointsSet.insert(points.begin(), points.end());
 
    if (debug) {
      cout << "The Hits are" << endl;
      copy(pointsSet.begin(), pointsSet.end(), ostream_iterator<DTSegmentCand::AssPoint>(std::cout));
      cout << "----" << endl;
    }
 
    DTSegmentCand* newCand = new DTSegmentCand(pointsSet, sl);
    if (theUpdator->fit(newCand, false, false))
      candidates.push_back(newCand);
    else
      delete newCand;  // bad seg, too few hits
  }
}
 
bool DTCombinatorialExtendedPatternReco::checkDoubleCandidates(vector<DTSegmentCand*>& cands, DTSegmentCand* seg) {
  for (vector<DTSegmentCand*>::iterator cand = cands.begin(); cand != cands.end(); ++cand)
    if (*(*cand) == *seg)
      return false;
  return true;
}
 
vector<DTSegmentExtendedCand*> DTCombinatorialExtendedPatternReco::extendCandidates(vector<DTSegmentCand*>& candidates,
                                                                                    const DTSuperLayer* sl) {
  if (debug)
    cout << "extendCandidates " << candidates.size() << endl;
  vector<DTSegmentExtendedCand*> result;
 
  // in case of phi SL just return
  if (sl->id().superLayer() != 2) {
    for (vector<DTSegmentCand*>::const_iterator cand = candidates.begin(); cand != candidates.end(); ++cand) {
      DTSegmentExtendedCand* extendedCand = new DTSegmentExtendedCand(*cand);
      // and delete the original candidate
      delete *cand;
      result.push_back(extendedCand);
    }
    return result;
  }
 
  // first I have to select the cluster which are compatible with the actual
  // candidate, namely +/-1 sector/station/wheel
  vector<DTSegmentExtendedCand::DTSLRecClusterForFit> clustersWithPos;
  if (debug)
    cout << "AllClustersWithPos " << theClusters.size() << endl;
  if (debug)
    cout << "SL:   " << sl->id() << endl;
  for (vector<DTSLRecCluster>::const_iterator clus = theClusters.begin(); clus != theClusters.end(); ++clus) {
    if (debug)
      cout << "CLUS: " << (*clus).superLayerId() << endl;
    if ((*clus).superLayerId().superLayer() == 2 && closeSL(sl->id(), (*clus).superLayerId())) {
      // and then get their pos in the actual SL frame
      const DTSuperLayer* clusSl = theDTGeometry->superLayer((*clus).superLayerId());
      LocalPoint pos = sl->toLocal(clusSl->toGlobal((*clus).localPosition()));
      //LocalError err=sl->toLocal(clusSl->toGlobal((*clus).localPositionError()));
      LocalError err = (*clus).localPositionError();
      clustersWithPos.push_back(DTSegmentExtendedCand::DTSLRecClusterForFit(*clus, pos, err));
    }
  }
  if (debug)
    cout << "closeClustersWithPos " << clustersWithPos.size() << endl;
 
  for (vector<DTSegmentCand*>::const_iterator cand = candidates.begin(); cand != candidates.end(); ++cand) {
    // create an extended candidate
    DTSegmentExtendedCand* extendedCand = new DTSegmentExtendedCand(*cand);
    // and delete the original candidate
    delete *cand;
    // do this only for theta SL
    if (extendedCand->superLayer()->id().superLayer() == 2) {
      // first check compatibility between cand and clusForFit
      for (vector<DTSegmentExtendedCand::DTSLRecClusterForFit>::const_iterator exClus = clustersWithPos.begin();
           exClus != clustersWithPos.end();
           ++exClus) {
        if (extendedCand->isCompatible(*exClus)) {
          if (debug)
            cout << "is compatible " << endl;
          // add compatible cluster
          extendedCand->addClus(*exClus);
        }
      }
      // fit the segment
      if (debug)
        cout << "extended cands nHits: " << extendedCand->nHits() << endl;
      if (theUpdator->fit(extendedCand, false, false)) {
        // add to result
        result.push_back(extendedCand);
      } else {
        cout << "Bad fit" << endl;
        delete extendedCand;
      }
    } else {  // Phi SuperLayer
      result.push_back(extendedCand);
    }
  }
 
  return result;
}
 
bool DTCombinatorialExtendedPatternReco::closeSL(const DTSuperLayerId& id1, const DTSuperLayerId& id2) {
  if (id1 == id2)
    return false;
  if (abs(id1.wheel() - id2.wheel()) > 1)
    return false;
  // take into account also sector 13 and 14
  int sec1 = (id1.sector() == 13) ? 4 : id1.sector();
  sec1 = (sec1 == 14) ? 10 : sec1;
  int sec2 = (id2.sector() == 13) ? 4 : id2.sector();
  sec2 = (sec2 == 14) ? 10 : sec2;
  // take into account also sector 1/12
  if (abs(sec1 - sec2) > 1 && abs(sec1 - sec2) != 11)
    return false;
  //if (abs(id1.station()-id2.station())>1 ) return false;
  return true;
}