GsfChi2MeasurementEstimator Class Reference

#include <GsfChi2MeasurementEstimator.h>

Inheritance diagram for GsfChi2MeasurementEstimator:

Public Member Functions
GsfChi2MeasurementEstimator *	clone () const override
std::pair< bool, double >	estimate (const TrajectoryStateOnSurface &, const TrackingRecHit &) const override
	GsfChi2MeasurementEstimator ()
	GsfChi2MeasurementEstimator (double aMaxChi2)
Public Member Functions inherited from Chi2MeasurementEstimatorBase
	Chi2MeasurementEstimatorBase (double maxChi2, double nSigma=3., float maxDisp=std::numeric_limits< float >::max())
template<typename... Args>
	Chi2MeasurementEstimatorBase (double maxChi2, double nSigma, float maxDisp, Args &&... args)
double	chiSquaredCut () const
bool	estimate (const TrajectoryStateOnSurface &ts, const Plane &plane) const final
Local2DVector	maximalLocalDisplacement (const TrajectoryStateOnSurface &ts, const Plane &plane) const final
double	nSigmaCut () const
Public Member Functions inherited from MeasurementEstimator
float	maxSagitta () const
	MeasurementEstimator ()
	MeasurementEstimator (float maxSag, float minToll, float mpt)
float	minPt2ForHitRecoveryInGluedDet () const
float	minTolerance2 () const
virtual bool	preFilter (const TrajectoryStateOnSurface &, OpaquePayload const &) const
virtual	~MeasurementEstimator ()

Private Attributes
Chi2MeasurementEstimator	theEstimator

Additional Inherited Members
Public Types inherited from MeasurementEstimator
using	HitReturnType = std::pair< bool, double >
using	Local2DVector = Vector2DBase< float, LocalTag >
using	SurfaceReturnType = bool
Protected Member Functions inherited from Chi2MeasurementEstimatorBase
std::pair< bool, double >	returnIt (double est) const

Detailed Description

Class which calculates the chisquare of a predicted Gaussian mixture trajectory state with respect to a reconstructed hit according to the Gaussian-sum filter (GSF) strategy. The relevant formulas can be found in R. Fruhwirth, Computer Physics Communications 100 (1997), 1.

Definition at line 15 of file GsfChi2MeasurementEstimator.h.

Constructor & Destructor Documentation

GsfChi2MeasurementEstimator() [1/2]

GsfChi2MeasurementEstimator::GsfChi2MeasurementEstimator ( )

inline

Definition at line 17 of file GsfChi2MeasurementEstimator.h.

Referenced by clone().

: Chi2MeasurementEstimatorBase(100.), theEstimator(100.) {}

GsfChi2MeasurementEstimator() [2/2]

GsfChi2MeasurementEstimator::GsfChi2MeasurementEstimator ( double  aMaxChi2 )

inline

Definition at line 19 of file GsfChi2MeasurementEstimator.h.

: Chi2MeasurementEstimatorBase(aMaxChi2), theEstimator(aMaxChi2) {}

Member Function Documentation

clone()

GsfChi2MeasurementEstimator* GsfChi2MeasurementEstimator::clone ( void  ) const

inlineoverridevirtual

Implements MeasurementEstimator.

Definition at line 23 of file GsfChi2MeasurementEstimator.h.

References GsfChi2MeasurementEstimator().

{ return new GsfChi2MeasurementEstimator(*this); }

estimate()

std::pair< bool, double > GsfChi2MeasurementEstimator::estimate ( const TrajectoryStateOnSurface &  ts, const TrackingRecHit &  hit  ) const

overridevirtual

Returns pair( true, value) if the TrajectoryStateOnSurface is compatible with the RecHit, and pair( false, value) if it is not compatible. The TrajectoryStateOnSurface must be on the same Surface as the RecHit. For an estimator where there is no value computed, e.g. fixed window estimator, only the first(bool) part is of interest.

Implements Chi2MeasurementEstimatorBase.

Definition at line 8 of file GsfChi2MeasurementEstimator.cc.

References hltPixelTracks_cff::chi2, Chi2MeasurementEstimator::estimate(), mps_fire::i, Chi2MeasurementEstimatorBase::returnIt(), theEstimator, PosteriorWeightsCalculator::weights(), and hltDeepSecondaryVertexTagInfosPFPuppi_cfi::weights.

                                                                                               {
  GetComponents comps(tsos);
  auto const& tsvec = comps();
  if (tsvec.empty()) {
    edm::LogError("GsfChi2MeasurementEstimator") << "Trying to calculate chi2 of hit with respect to empty mixture!";
    return std::make_pair(false, 0.);
  }

  auto const& weights = PosteriorWeightsCalculator(tsvec).weights(hit);
  if (weights.empty())
    return std::make_pair(false, 0);

  //   Chi2MeasurementEstimator est(chiSquaredCut());
  double chi2 = 0.;
  int i = 0;
  for (auto const& ts : tsvec)
    chi2 += weights[i++] * theEstimator.estimate(ts, hit).second;
  // Done - normalisation of weights is ensured
  // by PosteriorWeightsCalculator
  return returnIt(chi2);
}

Member Data Documentation

theEstimator

Chi2MeasurementEstimator GsfChi2MeasurementEstimator::theEstimator

private

Definition at line 26 of file GsfChi2MeasurementEstimator.h.

Referenced by estimate().