Acts::GaussianSumFitter< propagator_t, traj_t > Struct Template Reference

Gaussian Sum Fitter implementation. More...

#include <Acts/TrackFitting/GaussianSumFitter.hpp>

Collaboration diagram for Acts::GaussianSumFitter< propagator_t, traj_t >:

Public Types
using	GsfActor = detail::Gsf::GsfActor<traj_t>
	The actor type.
using	GsfNavigator = typename propagator_t::Navigator
	The navigator type.

Public Member Functions
	GaussianSumFitter (propagator_t &&propagator, std::shared_ptr< const BetheHeitlerApprox > bha, std::unique_ptr< const Logger > _logger=getDefaultLogger("GSF", Logging::INFO))
	Constructor with propagator, Bethe-Heitler approximation, and logger.
template<typename source_link_it_t, typename start_parameters_t, TrackContainerFrontend track_container_t>
auto	fit (source_link_it_t begin, source_link_it_t end, const start_parameters_t &sParameters, const GsfOptions< traj_t > &options, const std::vector< const Surface * > &sSequence, track_container_t &trackContainer) const
	The fit function for the Direct navigator.
template<typename source_link_it_t, typename start_parameters_t, TrackContainerFrontend track_container_t>
auto	fit (source_link_it_t begin, source_link_it_t end, const start_parameters_t &sParameters, const GsfOptions< traj_t > &options, track_container_t &trackContainer) const
	The fit function for the standard navigator.
template<typename source_link_it_t, typename start_parameters_t, typename fwd_prop_initializer_t, typename bwd_prop_initializer_t, TrackContainerFrontend track_container_t>
Acts::Result< typename track_container_t::TrackProxy >	fit_impl (source_link_it_t begin, source_link_it_t end, const start_parameters_t &sParameters, const GsfOptions< traj_t > &options, const fwd_prop_initializer_t &fwdPropInitializer, const bwd_prop_initializer_t &bwdPropInitializer, track_container_t &trackContainer) const
	The generic implementation of the fit function.
const Logger &	logger () const
	Get the logger instance.

Public Attributes
std::unique_ptr< const Logger >	m_actorLogger
	Logger instance for actor debugging.
std::shared_ptr< const BetheHeitlerApprox >	m_betheHeitlerApproximation
	The fitter holds the instance of the bethe heitler approx.
std::unique_ptr< const Logger >	m_logger
	The logger.
propagator_t	m_propagator
	The propagator instance used by the fit function.

Detailed Description

template<typename propagator_t, typename traj_t>
struct Acts::GaussianSumFitter< propagator_t, traj_t >

Gaussian Sum Fitter implementation.

Template Parameters

propagator_t	The propagator type on which the algorithm is built on, usually an instance of Acts::Propagator
traj_t	The MultiTrajectory type (backend)

Note

This GSF implementation tries to be as compatible to the KalmanFitter as possible. However, strict compatibility is not garantueed.

Currently there is no possibility to export the states of the individual components from the GSF, the only information returned in the MultiTrajectory are the means of the states. Therefore, also NO dedicated component smoothing is performed as described e.g. by R. Fruewirth.

Member Typedef Documentation

GsfActor

template<typename propagator_t, typename traj_t>

using Acts::GaussianSumFitter< propagator_t, traj_t >::GsfActor = detail::Gsf::GsfActor<traj_t>

The actor type.

GsfNavigator

template<typename propagator_t, typename traj_t>

using Acts::GaussianSumFitter< propagator_t, traj_t >::GsfNavigator = typename propagator_t::Navigator

The navigator type.

Constructor & Destructor Documentation

GaussianSumFitter()

template<typename propagator_t, typename traj_t>

Acts::GaussianSumFitter< propagator_t, traj_t >::GaussianSumFitter	(	propagator_t &&	propagator,
		std::shared_ptr< const BetheHeitlerApprox >	bha,
		std::unique_ptr< const Logger >	_logger = getDefaultLogger("GSF", Logging::INFO) )

Constructor with propagator, Bethe-Heitler approximation, and logger.

Parameters

propagator	Propagator for track propagation
bha	Bethe-Heitler approximation for energy loss modeling
_logger	Logger for diagnostic output

Member Function Documentation

fit() [1/2]

template<typename propagator_t, typename traj_t>

template<typename source_link_it_t, typename start_parameters_t, TrackContainerFrontend track_container_t>

auto Acts::GaussianSumFitter< propagator_t, traj_t >::fit	(	source_link_it_t	begin,
		source_link_it_t	end,
		const start_parameters_t &	sParameters,
		const GsfOptions< traj_t > &	options,
		const std::vector< const Surface * > &	sSequence,
		track_container_t &	trackContainer ) const

The fit function for the Direct navigator.

Parameters

begin	Iterator to the start of source links
end	Iterator to the end of source links
sParameters	Starting track parameters for the fit
options	Options for the GSF fit
sSequence	Sequence of surfaces to navigate through
trackContainer	Container to store the fitted track

Returns

Result containing fitted track proxy or error

fit() [2/2]

template<typename propagator_t, typename traj_t>

template<typename source_link_it_t, typename start_parameters_t, TrackContainerFrontend track_container_t>

auto Acts::GaussianSumFitter< propagator_t, traj_t >::fit	(	source_link_it_t	begin,
		source_link_it_t	end,
		const start_parameters_t &	sParameters,
		const GsfOptions< traj_t > &	options,
		track_container_t &	trackContainer ) const

The fit function for the standard navigator.

Parameters

begin	Iterator to the start of source links
end	Iterator to the end of source links
sParameters	Starting track parameters for the fit
options	Options for the GSF fit
trackContainer	Container to store the fitted track

Returns

Result containing fitted track proxy or error

fit_impl()

template<typename propagator_t, typename traj_t>

template<typename source_link_it_t, typename start_parameters_t, typename fwd_prop_initializer_t, typename bwd_prop_initializer_t, TrackContainerFrontend track_container_t>

Acts::Result< typename track_container_t::TrackProxy > Acts::GaussianSumFitter< propagator_t, traj_t >::fit_impl	(	source_link_it_t	begin,
		source_link_it_t	end,
		const start_parameters_t &	sParameters,
		const GsfOptions< traj_t > &	options,
		const fwd_prop_initializer_t &	fwdPropInitializer,
		const bwd_prop_initializer_t &	bwdPropInitializer,
		track_container_t &	trackContainer ) const

The generic implementation of the fit function.

TODO check what this function does with the referenceSurface is e.g. the first measurementSurface

Parameters

begin	Iterator to the start of source links
end	Iterator to the end of source links
sParameters	Starting track parameters for the fit
options	Options for the GSF fit
fwdPropInitializer	Initializer for forward propagation
bwdPropInitializer	Initializer for backward propagation
trackContainer	Container to store the fitted track

Returns

Result containing fitted track proxy with forward and backward propagation results

logger()

template<typename propagator_t, typename traj_t>

const Logger & Acts::GaussianSumFitter< propagator_t, traj_t >::logger

(

)

const

Get the logger instance.

Returns

Reference to the logger

Member Data Documentation

m_actorLogger

template<typename propagator_t, typename traj_t>

std::unique_ptr<const Logger> Acts::GaussianSumFitter< propagator_t, traj_t >::m_actorLogger

Logger instance for actor debugging.

m_betheHeitlerApproximation

template<typename propagator_t, typename traj_t>

std::shared_ptr<const BetheHeitlerApprox> Acts::GaussianSumFitter< propagator_t, traj_t >::m_betheHeitlerApproximation

The fitter holds the instance of the bethe heitler approx.

m_logger

template<typename propagator_t, typename traj_t>

std::unique_ptr<const Logger> Acts::GaussianSumFitter< propagator_t, traj_t >::m_logger

The logger.

m_propagator

template<typename propagator_t, typename traj_t>

propagator_t Acts::GaussianSumFitter< propagator_t, traj_t >::m_propagator

The propagator instance used by the fit function.