GsfVertexUpdator Class Reference

#include <GsfVertexUpdator.h>

Inheritance diagram for GsfVertexUpdator:

Public Types
typedef VertexTrack < 5 >::RefCountedLinearizedTrackState	RefCountedLinearizedTrackState
typedef CachingVertex < 5 >::RefCountedVertexTrack	RefCountedVertexTrack
Public Types inherited from VertexUpdator< 5 >
typedef CachingVertex< N > ::RefCountedVertexTrack	RefCountedVertexTrack

Public Member Functions
CachingVertex< 5 >	add (const CachingVertex< 5 > &oldVertex, const RefCountedVertexTrack track) const
VertexUpdator< 5 > *	clone () const
	GsfVertexUpdator (bool limit=false, const GsfVertexMerger *merger=0)
CachingVertex< 5 >	remove (const CachingVertex< 5 > &oldVertex, const RefCountedVertexTrack track) const
Public Member Functions inherited from VertexUpdator< 5 >
virtual CachingVertex< N >	add (const CachingVertex< N > &v, const typename CachingVertex< N >::RefCountedVertexTrack t) const =0
virtual CachingVertex< N >	remove (const CachingVertex< N > &v, const typename CachingVertex< N >::RefCountedVertexTrack t) const =0
	VertexUpdator ()
virtual	~VertexUpdator ()

Private Types
typedef std::vector < RefCountedLinearizedTrackState >	LTC
typedef std::pair< VertexState, double >	VertexChi2Pair
typedef std::pair< VertexState, WeightChi2Pair >	VertexComponent
typedef std::vector< VertexState >	VSC
typedef std::pair< double, double >	WeightChi2Pair

Private Member Functions
VertexChi2Pair	assembleVertexComponents (const std::vector< VertexComponent > &newVertexComponents) const
VertexComponent	createNewComponent (const VertexState &oldVertex, const RefCountedLinearizedTrackState linTrack, float weight, int sign) const

Private Attributes
KalmanVertexUpdator< 5 >	kalmanVertexUpdator
bool	limitComponents
DeepCopyPointerByClone < GsfVertexMerger >	theMerger
GsfVertexWeightCalculator	theWeightCalculator

Detailed Description

Vertex updator for the Gaussian Sum vertex filter. (c.f. Th.Speer & R. Fruewirth, Comp.Phys.Comm 174, 935 (2006) )

Definition at line 14 of file GsfVertexUpdator.h.

Member Typedef Documentation

typedef std::vector<RefCountedLinearizedTrackState> GsfVertexUpdator::LTC

private

Definition at line 51 of file GsfVertexUpdator.h.

typedef VertexTrack<5>::RefCountedLinearizedTrackState GsfVertexUpdator::RefCountedLinearizedTrackState

Definition at line 19 of file GsfVertexUpdator.h.

typedef CachingVertex<5>::RefCountedVertexTrack GsfVertexUpdator::RefCountedVertexTrack

Definition at line 18 of file GsfVertexUpdator.h.

typedef std::pair<VertexState, double> GsfVertexUpdator::VertexChi2Pair

private

Definition at line 54 of file GsfVertexUpdator.h.

typedef std::pair<VertexState, WeightChi2Pair> GsfVertexUpdator::VertexComponent

private

Definition at line 53 of file GsfVertexUpdator.h.

typedef std::vector<VertexState> GsfVertexUpdator::VSC

private

Definition at line 50 of file GsfVertexUpdator.h.

typedef std::pair<double, double> GsfVertexUpdator::WeightChi2Pair

private

Definition at line 52 of file GsfVertexUpdator.h.

Constructor & Destructor Documentation

GsfVertexUpdator::GsfVertexUpdator	(	bool	limit = false,
		const GsfVertexMerger *	merger = 0
	)

Definition at line 6 of file GsfVertexUpdator.cc.

References GsfVertexMerger::clone(), limitComponents, and theMerger.

Referenced by clone().

                                                                             :
  limitComponents (limit)
{
  if (limitComponents) theMerger = merger->clone();
}

Member Function Documentation

CachingVertex< 5 > GsfVertexUpdator::add	(	const CachingVertex< 5 > &	oldVertex,
		const RefCountedVertexTrack	track
	)		const

Method to add a track to an existing CachingVertex An invalid vertex is returned in case of problems during the update.

Definition at line 13 of file GsfVertexUpdator.cc.

References KalmanVertexUpdator< N >::add(), assembleVertexComponents(), VertexState::components(), createNewComponent(), CachingVertex< N >::hasPrior(), kalmanVertexUpdator, limitComponents, GsfVertexMerger::merge(), CachingVertex< N >::priorError(), CachingVertex< N >::priorPosition(), theMerger, CachingVertex< N >::totalChiSquared(), CachingVertex< N >::tracks(), CachingVertex< N >::vertexState(), VertexState::weight(), and VertexState::weightTimesPosition().

Referenced by GsfVertexSmoother::smooth().

{

  VSC prevVtxComponents = oldVertex.vertexState().components();

//   cout << "GsfVertexUpdator::Add new Track with "
//       << track->linearizedTrack()->components().size() << " components to vertex of "
//       << prevVtxComponents.size() << " components.\n";

  if (prevVtxComponents.empty()) {
  throw VertexException
    ("GsfVertexUpdator::(Previous) Vertex to update has no components");
  }

  LTC ltComponents = track->linearizedTrack()->components();
  if (ltComponents.empty()) {
  throw VertexException
    ("GsfVertexUpdator::Track to add to vertex has no components");
  }

  if ((ltComponents.size()==1) && (prevVtxComponents.size()==1)) 
    return kalmanVertexUpdator.add(oldVertex, track);

  float trackWeight = track->weight();

  std::vector<VertexComponent> newVertexComponents;
  newVertexComponents.reserve(prevVtxComponents.size()*ltComponents.size());

//     for (LTC::iterator trackCompIter = ltComponents.begin();
//      trackCompIter != ltComponents.end(); trackCompIter++ ) {
//   cout <<(**trackCompIter).state().globalPosition()<<endl;
//     }

  for (VSC::iterator vertexCompIter = prevVtxComponents.begin();
    vertexCompIter != prevVtxComponents.end(); vertexCompIter++ ) {
    for (LTC::iterator trackCompIter = ltComponents.begin();
    trackCompIter != ltComponents.end(); trackCompIter++ ) {
      newVertexComponents.push_back(
        createNewComponent(*vertexCompIter, *trackCompIter, trackWeight, +1));
     // return invalid vertex in case one of the updated vertex-components is invalid
      if (!newVertexComponents.back().first.isValid()) return CachingVertex<5>();
    }
  }
//   cout << "updator components: "<<newVertexComponents.size()<<endl;

  // Update tracks vector

  std::vector<RefCountedVertexTrack> newVertexTracks = oldVertex.tracks();
  newVertexTracks.push_back(track);
//   cout << "a \n ";

  // Assemble VertexStates and compute Chi**2

  VertexChi2Pair vertexChi2Pair = assembleVertexComponents(newVertexComponents);
//   cout << "b \n ";
  VertexState newVertexState = vertexChi2Pair.first;
//   cout << "c \n ";
  double chi2 = oldVertex.totalChiSquared() + vertexChi2Pair.second;

  // Merge:
  if (limitComponents) newVertexState = theMerger->merge(newVertexState);

  if  (oldVertex.hasPrior()) {
    return CachingVertex<5>(oldVertex.priorPosition(), oldVertex.priorError(),
            newVertexState.weightTimesPosition(),
        newVertexState.weight(), newVertexTracks, chi2);
  } else {
    return CachingVertex<5>(newVertexState, newVertexTracks, chi2);
  }


}

GsfVertexUpdator::VertexChi2Pair GsfVertexUpdator::assembleVertexComponents ( const std::vector< VertexComponent > &  newVertexComponents ) const

private

Definition at line 134 of file GsfVertexUpdator.cc.

References CommonMethods::weight().

Referenced by add().

{
  VSC vertexComponents;
  vertexComponents.reserve(newVertexComponents.size());
  
  //renormalize weights
// cout << "assemble "<<newVertexComponents.size()<<endl;
  double totalWeight = 0.;
  double totalChi2 = 0.;

  for (std::vector<VertexComponent>::const_iterator iter = newVertexComponents.begin();
    iter != newVertexComponents.end(); iter ++) {
    totalWeight += iter->second.first;
  }
// cout << "totalWeight "<<totalWeight<<endl;
  if (totalWeight<DBL_MIN) {
    edm::LogWarning("GsfVertexUpdator") << "Updated Vertex has total weight of 0. "
    <<"The track is probably very far away.";
    return VertexChi2Pair( VertexState(), 0.);
  }

  for (std::vector<VertexComponent>::const_iterator iter = newVertexComponents.begin();
    iter != newVertexComponents.end(); iter ++) {
    double weight = iter->second.first/totalWeight;
    if (iter->second.first>DBL_MIN) {
      vertexComponents.push_back(VertexState(iter->first.weightTimesPosition(),
       iter->first.weight(), weight));
      totalChi2 += iter->second.second * weight;
    }
  }
// cout << "totalChi2 "<<totalChi2<<endl;
// cout << "vertexComponents "<<vertexComponents.size()<<endl;

  if (vertexComponents.empty()){
    edm::LogWarning("GsfVertexUpdator") << "No Vertex State left after reweighting.";
    return VertexChi2Pair( VertexState(), 0.);
  }

  return VertexChi2Pair( VertexState( new BasicMultiVertexState( vertexComponents)),
            totalChi2);
}

VertexUpdator<5>* GsfVertexUpdator::clone ( void  ) const

inlinevirtual

Clone method

Implements VertexUpdator< 5 >.

Definition at line 42 of file GsfVertexUpdator.h.

References GsfVertexUpdator().

   {
    return new GsfVertexUpdator(* this);
   }

GsfVertexUpdator::VertexComponent GsfVertexUpdator::createNewComponent ( const VertexState &  oldVertex, const RefCountedLinearizedTrackState  linTrack, float  weight, int  sign  ) const

private

Where one component of the previous vertex gets updated with one component of the track.

Definition at line 104 of file GsfVertexUpdator.cc.

References abs, GsfVertexWeightCalculator::calculate(), KalmanVertexUpdator< N >::chi2Increment(), VertexState::isValid(), kalmanVertexUpdator, KalmanVertexUpdator< N >::positionUpdate(), and theWeightCalculator.

Referenced by add().

{

  if(abs(sign) != 1)
    throw VertexException ("GsfVertexUpdator::sign not equal to 1.");

  if(sign == -1)
    throw VertexException("GsfVertexUpdator::sign of -1 not yet implemented.");


  // Weight of the component in the mixture (non-normalized)
  double weightInMixture = theWeightCalculator.calculate(oldVertex, linTrack, 1.E9);
  if (weightInMixture < 0.) return VertexComponent(VertexState(), WeightChi2Pair(0.,0.));

  // position estimate of the component
  VertexState newVertex = kalmanVertexUpdator.positionUpdate(oldVertex, 
                linTrack, weight, sign);
  if (!newVertex.isValid()) return VertexComponent(newVertex, WeightChi2Pair(0.,0.));

  //Chi**2 contribution of the component
  std::pair <bool, double> chi2P = kalmanVertexUpdator.chi2Increment(oldVertex, newVertex, 
                linTrack, weight);
  if (!chi2P.first) return VertexComponent(VertexState(), WeightChi2Pair(0.,0.));
//         cout << "Update: "<<oldVertex.position()<<" "<<newVertex.position()<<" "<<chi2
//       <<" "<<linTrack->weightInMixture()<<" "<<weightInMixture<<endl;

  return VertexComponent(newVertex, WeightChi2Pair(weightInMixture, chi2P.second));
}

CachingVertex< 5 > GsfVertexUpdator::remove	(	const CachingVertex< 5 > &	oldVertex,
		const RefCountedVertexTrack	track
	)		const

Method removing already used VertexTrack from existing CachingVertex This method is not yet implemented.

Definition at line 90 of file GsfVertexUpdator.cc.

{
  throw VertexException("GsfVertexUpdator::Remove Methode not yet done");
//  return CachingVertex<5>();
}

Member Data Documentation

KalmanVertexUpdator<5> GsfVertexUpdator::kalmanVertexUpdator

private

Definition at line 64 of file GsfVertexUpdator.h.

Referenced by add(), and createNewComponent().

bool GsfVertexUpdator::limitComponents

private

Definition at line 62 of file GsfVertexUpdator.h.

Referenced by add(), and GsfVertexUpdator().

DeepCopyPointerByClone<GsfVertexMerger> GsfVertexUpdator::theMerger

private

Definition at line 63 of file GsfVertexUpdator.h.

Referenced by add(), and GsfVertexUpdator().

GsfVertexWeightCalculator GsfVertexUpdator::theWeightCalculator

private

Definition at line 65 of file GsfVertexUpdator.h.

Referenced by createNewComponent().