A base class for 'generalised' objective functions, i.e. objective functions for which at least a 'gradient' is defined. More...

#include "stir/recon_buildblock/GeneralisedObjectiveFunction.h"

Inheritance diagram for stir::GeneralisedObjectiveFunction< TargetT >:

[legend]

Public Member Functions
virtual TargetT *	construct_target_ptr () const =0
	Creates a suitable target as determined by the parameters. More...

virtual Succeeded	set_up (shared_ptr< TargetT > const &target_sptr)
	Has to be called before using this object.

virtual void	compute_sub_gradient (TargetT &gradient, const TargetT &current_estimate, const int subset_num)
	Compute the subset-gradient of the objective function at current_estimate. More...

virtual void	compute_sub_gradient_without_penalty (TargetT &gradient, const TargetT &current_estimate, const int subset_num)=0
	This should compute the subset-gradient of the unregularised objective function at current_estimate. More...

virtual void	compute_gradient (TargetT &gradient, const TargetT &current_estimate)
	Compute the gradient of the objective function at the current_estimate. More...

virtual void	compute_gradient_without_penalty (TargetT &gradient, const TargetT &current_estimate)
	Compute the gradient of the unregularised objective function at the current_estimate. More...

virtual double	compute_objective_function_without_penalty (const TargetT &current_estimate, const int subset_num)
	Compute the value of the unregularised sub-objective function at the current_estimate. More...

virtual double	compute_objective_function_without_penalty (const TargetT &current_estimate)
	Compute the value of the unregularised objective function at the current_estimate. More...

double	compute_penalty (const TargetT &current_estimate, const int subset_num)
	Compute the value of the sub-penalty at the current_estimate. More...

double	compute_penalty (const TargetT &current_estimate)
	Compute the value of the penalty at the current_estimate. More...

double	compute_objective_function (const TargetT &current_estimate, const int subset_num)
	Compute the value of the sub-objective function at the current_estimate. More...

double	compute_objective_function (const TargetT &current_estimate)
	Compute the value of the objective function at the current_estimate. More...

double	compute_value (const TargetT &current_estimate)
	Alias for compute_objective_function(const TargetT&)

virtual void	fill_nonidentifiable_target_parameters (TargetT &target, const float value) const
	Fill any elements that we cannot estimate with a fixed value. More...

std::string	get_objective_function_values_report (const TargetT &current_estimate)
	Construct a string with info on the value of objective function with and without penalty.

int	get_num_subsets () const
	Return the number of subsets in-use.

virtual std::unique_ptr< ExamInfo >	get_exam_info_uptr_for_target () const

virtual int	set_num_subsets (const int num_subsets)=0
	Attempts to change the number of subsets. More...

bool	subsets_are_approximately_balanced () const
	Checks of the current subset scheme is approximately balanced. More...

bool	subsets_are_approximately_balanced (std::string &warning_message) const
	Checks of the current subset scheme is approximately balanced and constructs a warning message. More...

bool	prior_is_zero () const
	check if the prior is set (or the penalisation factor is 0)

GeneralisedPrior< TargetT > *const	get_prior_ptr () const
	Read-only access to the prior. More...

shared_ptr< GeneralisedPrior< TargetT > >	get_prior_sptr ()

void	set_prior_sptr (const shared_ptr< GeneralisedPrior< TargetT >> &)
	Change the prior. More...

virtual void	set_input_data (const shared_ptr< ExamData > &)=0
	set_input_data More...

virtual const ExamData &	get_input_data () const =0
	get input data More...

virtual void	set_additive_proj_data_sptr (const shared_ptr< ExamData > &)=0
	set_additive_proj_data_sptr More...

virtual void	set_normalisation_sptr (const shared_ptr< BinNormalisation > &)=0
	set_normalisation_sptr More...

multiplication with approximate (sub)Hessian
Succeeded	add_multiplication_with_approximate_sub_Hessian_without_penalty (TargetT &output, const TargetT &input, const int subset_num) const
	Functions that multiply the approximate (sub)Hessian with a \'vector\'. More...

Succeeded	add_multiplication_with_approximate_sub_Hessian (TargetT &output, const TargetT &input, const int subset_num) const

Succeeded	add_multiplication_with_approximate_Hessian_without_penalty (TargetT &output, const TargetT &input) const

Succeeded	add_multiplication_with_approximate_Hessian (TargetT &output, const TargetT &input) const

multiplication (sub)Hessian times input
Succeeded	accumulate_Hessian_times_input (TargetT &output, const TargetT &current_image_estimate, const TargetT &input) const
	Functions that multiply the True (sub)Hessian with a \'vector\'. More...

Succeeded	accumulate_Hessian_times_input_without_penalty (TargetT &output, const TargetT &current_image_estimate, const TargetT &input) const

Succeeded	accumulate_sub_Hessian_times_input (TargetT &output, const TargetT &current_image_estimate, const TargetT &input, const int subset_num) const

Succeeded	accumulate_sub_Hessian_times_input_without_penalty (TargetT &output, const TargetT &current_image_estimate, const TargetT &input, const int subset_num) const

Public Member Functions inherited from stir::RegisteredObjectBase
virtual std::string	get_registered_name () const =0
	Returns the name of the type of the object. More...

Public Member Functions inherited from stir::ParsingObject
	ParsingObject (const ParsingObject &)

ParsingObject &	operator= (const ParsingObject &)

void	ask_parameters ()

virtual std::string	parameter_info ()

bool	parse (std::istream &f)

bool	parse (const char *const filename)

Protected Member Functions
void	set_defaults () override
	sets any default values More...

void	initialise_keymap () override
	sets parsing keys More...

virtual bool	actual_subsets_are_approximately_balanced (std::string &warning_message) const =0
	Implementation of function that checks subset balancing. More...

virtual double	actual_compute_objective_function_without_penalty (const TargetT &current_estimate, const int subset_num)=0
	Implementation of function that computes the objective function for the current subset. More...

virtual Succeeded	actual_add_multiplication_with_approximate_sub_Hessian_without_penalty (TargetT &output, const TargetT &input, const int subset_num) const
	Implementation of the function that multiplies the approximate sub-Hessian with a vector. More...

virtual Succeeded	actual_accumulate_sub_Hessian_times_input_without_penalty (TargetT &output, const TargetT &current_image_estimate, const TargetT &input, const int subset_num) const
	Implementation of the function computes the sub-Hessian and multiplies by a vector. More...

Protected Member Functions inherited from stir::ParsingObject
virtual bool	post_processing ()
	This will be called at the end of the parsing. More...

virtual void	set_key_values ()
	This will be called before parsing or parameter_info is called. More...

Protected Attributes
int	num_subsets

bool	already_set_up

shared_ptr< GeneralisedPrior< TargetT > >	prior_sptr

Protected Attributes inherited from stir::ParsingObject
KeyParser	parser

Additional Inherited Members
Static Public Member Functions inherited from stir::RegisteredObject< GeneralisedObjectiveFunction< TargetT > >
static GeneralisedObjectiveFunction< TargetT > *	read_registered_object (std::istream *in, const std::string &registered_name)
	Construct a new object (of a type derived from Root, its actual type determined by the registered_name parameter) by parsing the istream. More...

static GeneralisedObjectiveFunction< TargetT > *	ask_type_and_parameters ()
	ask the user for the type, and then calls read_registered_object(0, type) More...

static void	list_registered_names (std::ostream &stream)
	List all possible registered names to the stream. More...

Protected Types inherited from stir::RegisteredObject< GeneralisedObjectiveFunction< TargetT > >
typedef GeneralisedObjectiveFunction< TargetT > (	RootFactory) (std::istream *)
	The type of a root factory is a function, taking an istream* as argument, and returning a Root*.

typedef FactoryRegistry< std::string, RootFactory, interfile_less >	RegistryType
	The type of the registry.

Static Protected Member Functions inherited from stir::RegisteredObject< GeneralisedObjectiveFunction< TargetT > >
static RegistryType &	registry ()
	Static function returning the registry. More...

Detailed Description

template<typename TargetT>
class stir::GeneralisedObjectiveFunction< TargetT >

A base class for 'generalised' objective functions, i.e. objective functions for which at least a 'gradient' is defined.

Some iterative algorithms use an 'objective function' only in a loose sense. They might for instance allow generalisations which no longer optimise a function. For example in the case of PoissonLogLikelihoodWithLinearModelForMeanAndProjData with non-matching forward and back projectors, the 'gradient' that is computed is generally not the gradient of the log-likelihood that corresponds to the forward projector. However, one hopes that it still points towards the optimum.

Often, one includes a penalty (or prior) in the objective function. This class uses a GeneralisedPrior object for this. Note that we use the convention that the objective function is maximised. The penalty is expected to be a function that increases with higher penalty, so it will be subtracted from the unregularised case.

In tomography, we often use subsets, where the objective function is written as a sum of sub-objective functions. This class has some subset functionality. When using subsets, the penalty will be distributed evenly over all subsets. While this increases the computational cost, it makes the subsets more 'balanced' which is best for most algorithms.

See also: IterativeReconstruction

Todo:: Currently, there is subset code in both IterativeReconstruction and here. This is confusing and leads to repetition. It probably should all be moved here.

Parameters for parsing

; specify prior, see GeneralisedObjectiveFunction<TargetT> hierarchy for possible values
prior type :=

Member Function Documentation

◆ construct_target_ptr()

template<typename TargetT>

virtual TargetT* stir::GeneralisedObjectiveFunction< TargetT >::construct_target_ptr ( ) const

pure virtual

Creates a suitable target as determined by the parameters.

Warning: This should not check already_set_up (unfortunately), as it is currently called in Reconstruction::reconstruct() before calling set_up().

Implemented in stir::PoissonLogLikelihoodWithLinearModelForMeanAndProjData< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndListModeDataWithProjMatrixByBin< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndGatedProjDataWithMotion< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndGatedProjDataWithMotion< TargetT >, and stir::PoissonLogLikelihoodWithLinearKineticModelAndDynamicProjectionData< TargetT >.

◆ compute_sub_gradient()

template<typename TargetT >

void stir::GeneralisedObjectiveFunction< TargetT >::compute_sub_gradient	(	TargetT &	gradient,
		const TargetT &	current_estimate,
		const int	subset_num
	)

virtual

Compute the subset-gradient of the objective function at current_estimate.

The subset-gradient is the gradient of the objective function restricted to the subset specified. What this means depends on how this function is implemented later on in the hierarchy.

Computed as the difference of compute_sub_gradient_without_penalty and get_prior_ptr()->compute_gradient()/num_subsets.

Warning: Any data in gradient will be overwritten.

References stir::error().

◆ compute_sub_gradient_without_penalty()

template<typename TargetT>

virtual void stir::GeneralisedObjectiveFunction< TargetT >::compute_sub_gradient_without_penalty	(	TargetT &	gradient,
		const TargetT &	current_estimate,
		const int	subset_num
	)

pure virtual

This should compute the subset-gradient of the unregularised objective function at current_estimate.

Warning: The derived class should overwrite any data in gradient.

Implemented in stir::PoissonLogLikelihoodWithLinearModelForMean< TargetT >, and stir::SumOfGeneralisedObjectiveFunctions< PoissonLogLikelihoodWithLinearModelForMeanAndProjData< TargetT >, TargetT, PoissonLogLikelihoodWithLinearModelForMean< TargetT > >.

◆ compute_gradient()

template<typename TargetT >

void stir::GeneralisedObjectiveFunction< TargetT >::compute_gradient	(	TargetT &	gradient,
		const TargetT &	current_estimate
	)

virtual

Compute the gradient of the objective function at the current_estimate.

Computed as the difference of compute_gradient_without_penalty and get_prior_ptr()->compute_gradient().

Warning: Any data in gradient will be overwritten.

◆ compute_gradient_without_penalty()

template<typename TargetT >

void stir::GeneralisedObjectiveFunction< TargetT >::compute_gradient_without_penalty	(	TargetT &	gradient,
		const TargetT &	current_estimate
	)

virtual

Compute the gradient of the unregularised objective function at the current_estimate.

Computed by summing subset-gradients.

Warning: Any data in gradient will be overwritten.

◆ compute_objective_function_without_penalty() [1/2]

template<typename TargetT >

double stir::GeneralisedObjectiveFunction< TargetT >::compute_objective_function_without_penalty	(	const TargetT &	current_estimate,
		const int	subset_num
	)

virtual

Compute the value of the unregularised sub-objective function at the current_estimate.

Implemented in terms of actual_compute_objective_function_without_penalty.

References stir::error().

◆ compute_objective_function_without_penalty() [2/2]

template<typename TargetT >

double stir::GeneralisedObjectiveFunction< TargetT >::compute_objective_function_without_penalty ( const TargetT & current_estimate )

virtual

Compute the value of the unregularised objective function at the current_estimate.

Computed by summing over all subsets.

◆ compute_penalty() [1/2]

template<typename TargetT >

double stir::GeneralisedObjectiveFunction< TargetT >::compute_penalty	(	const TargetT &	current_estimate,
		const int	subset_num
	)

Compute the value of the sub-penalty at the current_estimate.

As each subset contains the same penalty, this function returns the same as

compute_penalty(current_estimate)/num_subsets

Implemented in terms of GeneralisedPrior::compute_value.

See also: compute_objective_function(const TargetT&) for sign conventions.

◆ compute_penalty() [2/2]

template<typename TargetT >

double stir::GeneralisedObjectiveFunction< TargetT >::compute_penalty ( const TargetT & current_estimate )

Compute the value of the penalty at the current_estimate.

Implemented in terms of GeneralisedPrior::compute_value.

References stir::GeneralisedObjectiveFunction< TargetT >::compute_value().

◆ compute_objective_function() [1/2]

template<typename TargetT >

double stir::GeneralisedObjectiveFunction< TargetT >::compute_objective_function	(	const TargetT &	current_estimate,
		const int	subset_num
	)

Compute the value of the sub-objective function at the current_estimate.

Computed as the difference of compute_objective_function_without_penalty and compute_penalty.

◆ compute_objective_function() [2/2]

template<typename TargetT >

double stir::GeneralisedObjectiveFunction< TargetT >::compute_objective_function ( const TargetT & current_estimate )

Compute the value of the objective function at the current_estimate.

Computed as the difference of compute_objective_function_without_penalty and compute_penalty.

◆ fill_nonidentifiable_target_parameters()

template<typename TargetT>

virtual void stir::GeneralisedObjectiveFunction< TargetT >::fill_nonidentifiable_target_parameters	(	TargetT &	target,
		const float	value
	)		const

inlinevirtual

Fill any elements that we cannot estimate with a fixed value.

In many cases, it is easier to use a larger target than what we can actually estimate. For instance, using a rectangular image while we estimate only a circular region.

For some algorithms, it is important that the parameters that cannot be estimate are set to 0 (or some other value). For example, if the outer voxels contribute to the forward projection of an image, but not to a backprojection.

This function allows you to do that. Its default implementation is to do nothing. It is up to the derived class to implement this sensible.

Todo:: The type of the value should really be derived from e.g. TargetT::full_iterator.

Reimplemented in stir::PoissonLogLikelihoodWithLinearModelForMean< TargetT >.

◆ add_multiplication_with_approximate_sub_Hessian_without_penalty()

template<typename TargetT >

Succeeded stir::GeneralisedObjectiveFunction< TargetT >::add_multiplication_with_approximate_sub_Hessian_without_penalty	(	TargetT &	output,
		const TargetT &	input,
		const int	subset_num
	)		const

Functions that multiply the approximate (sub)Hessian with a \'vector\'.

All these functions add their result to any existing data in output.

They all call actual_add_multiplication_with_approximate_sub_Hessian_without_penalty.

References stir::error(), and stir::warning().

◆ accumulate_Hessian_times_input()

template<typename TargetT >

Succeeded stir::GeneralisedObjectiveFunction< TargetT >::accumulate_Hessian_times_input	(	TargetT &	output,
		const TargetT &	current_image_estimate,
		const TargetT &	input
	)		const

Functions that multiply the True (sub)Hessian with a \'vector\'.

All these functions add their result to any existing data in output.

They all call actual_accumulate_sub_Hessian_times_input_without_penalty.

References stir::GeneralisedObjectiveFunction< TargetT >::accumulate_Hessian_times_input(), stir::error(), and stir::warning().

Referenced by stir::GeneralisedObjectiveFunction< TargetT >::accumulate_Hessian_times_input().

◆ set_num_subsets()

template<typename TargetT>

virtual int stir::GeneralisedObjectiveFunction< TargetT >::set_num_subsets ( const int num_subsets )

pure virtual

Attempts to change the number of subsets.

Returns: The number of subsets that will be used later, which is not guaranteed to be what you asked for.

Implemented in stir::PoissonLogLikelihoodWithLinearModelForMeanAndProjData< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndGatedProjDataWithMotion< TargetT >, stir::PoissonLogLikelihoodWithLinearKineticModelAndDynamicProjectionData< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndListModeDataWithProjMatrixByBin< TargetT >, and stir::SumOfGeneralisedObjectiveFunctions< PoissonLogLikelihoodWithLinearModelForMeanAndProjData< TargetT >, TargetT, PoissonLogLikelihoodWithLinearModelForMean< TargetT > >.

◆ subsets_are_approximately_balanced() [1/2]

template<typename TargetT >

bool stir::GeneralisedObjectiveFunction< TargetT >::subsets_are_approximately_balanced ( ) const

Checks of the current subset scheme is approximately balanced.

Balanced subsets means that the sub-gradients point all roughly in the same direction (at least when far from the optimum).

This function tests if this is approximately true, such that a reconstruction algorithm can either adapt or abort.

Implemented in terms of actual_subsets_are_approximately_balanced(std::string&).

◆ subsets_are_approximately_balanced() [2/2]

template<typename TargetT >

bool stir::GeneralisedObjectiveFunction< TargetT >::subsets_are_approximately_balanced ( std::string & warning_message ) const

Checks of the current subset scheme is approximately balanced and constructs a warning message.

See also: subsets_are_approximately_balanced()

Parameters

warning_message A string variable. If the subsets are not (approx.) balanced, this function will append a warning message explaining why.

References stir::error().

◆ get_prior_ptr()

template<typename TargetT >

GeneralisedPrior< TargetT > *const stir::GeneralisedObjectiveFunction< TargetT >::get_prior_ptr ( ) const

Read-only access to the prior.

Todo:: It would be nicer to not return a pointer.

◆ set_prior_sptr()

template<typename TargetT >

void stir::GeneralisedObjectiveFunction< TargetT >::set_prior_sptr ( const shared_ptr< GeneralisedPrior< TargetT >> & arg )

Change the prior.

Warning: You should call set_up() again after using this function.

◆ set_input_data()

template<typename TargetT>

virtual void stir::GeneralisedObjectiveFunction< TargetT >::set_input_data ( const shared_ptr< ExamData > & )

pure virtual

set_input_data

Author: Nikos Efthimiou

It can be used to set the data to be reconstructed within some other code, as opposed to via parsing.

Implemented in stir::PoissonLogLikelihoodWithLinearModelForMeanAndProjData< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndGatedProjDataWithMotion< TargetT >, stir::PoissonLogLikelihoodWithLinearKineticModelAndDynamicProjectionData< TargetT >, and stir::PoissonLogLikelihoodWithLinearModelForMeanAndListModeData< TargetT >.

◆ get_input_data()

template<typename TargetT>

virtual const ExamData& stir::GeneralisedObjectiveFunction< TargetT >::get_input_data ( ) const

pure virtual

get input data

Will throw an exception if it wasn't set first

Implemented in stir::PoissonLogLikelihoodWithLinearModelForMeanAndProjData< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndGatedProjDataWithMotion< TargetT >, stir::PoissonLogLikelihoodWithLinearKineticModelAndDynamicProjectionData< TargetT >, and stir::PoissonLogLikelihoodWithLinearModelForMeanAndListModeData< TargetT >.

◆ set_additive_proj_data_sptr()

template<typename TargetT>

virtual void stir::GeneralisedObjectiveFunction< TargetT >::set_additive_proj_data_sptr ( const shared_ptr< ExamData > & )

pure virtual

set_additive_proj_data_sptr

Author: Nikos Efthimiou

In the case the reconstruction process is called from another piece of code, the user should be able to set any additive sinogram

Implemented in stir::PoissonLogLikelihoodWithLinearModelForMeanAndProjData< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndGatedProjDataWithMotion< TargetT >, stir::PoissonLogLikelihoodWithLinearKineticModelAndDynamicProjectionData< TargetT >, and stir::PoissonLogLikelihoodWithLinearModelForMeanAndListModeData< TargetT >.

◆ set_normalisation_sptr()

template<typename TargetT>

virtual void stir::GeneralisedObjectiveFunction< TargetT >::set_normalisation_sptr ( const shared_ptr< BinNormalisation > & )

pure virtual

set_normalisation_sptr

Author: Nikos Efthimiou

In the case the reconstruction process is called from another piece of code, the user should be able to set any additive sinogram

Implemented in stir::PoissonLogLikelihoodWithLinearModelForMeanAndProjData< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndGatedProjDataWithMotion< TargetT >, stir::PoissonLogLikelihoodWithLinearKineticModelAndDynamicProjectionData< TargetT >, and stir::PoissonLogLikelihoodWithLinearModelForMeanAndListModeData< TargetT >.

◆ set_defaults()

template<typename TargetT >

void stir::GeneralisedObjectiveFunction< TargetT >::set_defaults ( )

overrideprotectedvirtual

sets any default values

Has to be called by set_defaults in the leaf-class

Reimplemented from stir::ParsingObject.

Reimplemented in stir::PoissonLogLikelihoodWithLinearModelForMeanAndProjData< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMean< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndGatedProjDataWithMotion< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndListModeData< TargetT >, stir::PoissonLogLikelihoodWithLinearKineticModelAndDynamicProjectionData< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndDynamicProjData< TargetT >, and stir::PoissonLogLikelihoodWithLinearModelForMeanAndListModeDataWithProjMatrixByBin< TargetT >.

◆ initialise_keymap()

template<typename TargetT >

void stir::GeneralisedObjectiveFunction< TargetT >::initialise_keymap ( )

overrideprotectedvirtual

sets parsing keys

Has to be called by initialise_keymap in the leaf-class

Reimplemented from stir::ParsingObject.

Reimplemented in stir::PoissonLogLikelihoodWithLinearModelForMeanAndProjData< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMean< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndGatedProjDataWithMotion< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndListModeData< TargetT >, stir::PoissonLogLikelihoodWithLinearKineticModelAndDynamicProjectionData< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndDynamicProjData< TargetT >, and stir::PoissonLogLikelihoodWithLinearModelForMeanAndListModeDataWithProjMatrixByBin< TargetT >.

◆ actual_subsets_are_approximately_balanced()

template<typename TargetT>

virtual bool stir::GeneralisedObjectiveFunction< TargetT >::actual_subsets_are_approximately_balanced ( std::string & warning_message ) const

protectedpure virtual

Implementation of function that checks subset balancing.

See also: subsets_are_approximately_balanced(std::string&)

Developer\'s note

The reason we have this function is that overloading subsets_are_approximately_balanced(std::string&) in a derived class would hide subsets_are_approximately_balanced().

Implemented in stir::PoissonLogLikelihoodWithLinearModelForMeanAndProjData< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndGatedProjDataWithMotion< TargetT >, stir::PoissonLogLikelihoodWithLinearKineticModelAndDynamicProjectionData< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndListModeDataWithProjMatrixByBin< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndDynamicProjData< TargetT >, and stir::SumOfGeneralisedObjectiveFunctions< PoissonLogLikelihoodWithLinearModelForMeanAndProjData< TargetT >, TargetT, PoissonLogLikelihoodWithLinearModelForMean< TargetT > >.

◆ actual_compute_objective_function_without_penalty()

template<typename TargetT>

virtual double stir::GeneralisedObjectiveFunction< TargetT >::actual_compute_objective_function_without_penalty	(	const TargetT &	current_estimate,
		const int	subset_num
	)

protectedpure virtual

Implementation of function that computes the objective function for the current subset.

See also: compute_objective_function_without_penalty(const Target&,const int)

Developer\'s note

The reason we have this function is that overloading a function in a derived class, hides all functions of the same name.

Implemented in stir::PoissonLogLikelihoodWithLinearModelForMeanAndProjData< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndGatedProjDataWithMotion< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndListModeDataWithProjMatrixByBin< TargetT >, and stir::PoissonLogLikelihoodWithLinearKineticModelAndDynamicProjectionData< TargetT >.

◆ actual_add_multiplication_with_approximate_sub_Hessian_without_penalty()

template<typename TargetT >

Succeeded stir::GeneralisedObjectiveFunction< TargetT >::actual_add_multiplication_with_approximate_sub_Hessian_without_penalty	(	TargetT &	output,
		const TargetT &	input,
		const int	subset_num
	)		const

protectedvirtual

Implementation of the function that multiplies the approximate sub-Hessian with a vector.

See also: multiplication_with_approximate_sub_Hessian_without_penalty(TargetT&,const TargetT&, const int).

Warning: The default implementation just calls error(). This behaviour has to be overloaded by the derived classes.

Developer\'s note

The reason we have this function is that overloading a function in a derived class, hides all functions of the same name.

Reimplemented in stir::PoissonLogLikelihoodWithLinearModelForMeanAndProjData< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndGatedProjDataWithMotion< TargetT >, and stir::PoissonLogLikelihoodWithLinearKineticModelAndDynamicProjectionData< TargetT >.

References stir::error().

◆ actual_accumulate_sub_Hessian_times_input_without_penalty()

template<typename TargetT >

Succeeded stir::GeneralisedObjectiveFunction< TargetT >::actual_accumulate_sub_Hessian_times_input_without_penalty	(	TargetT &	output,
		const TargetT &	current_image_estimate,
		const TargetT &	input,
		const int	subset_num
	)		const

protectedvirtual

Implementation of the function computes the sub-Hessian and multiplies by a vector.

See also: accumulate_sub_Hessian_times_input_without_penalty(TargetT&,const TargetT&, TargetT&, const int).

Warning: The default implementation just calls error(). This behaviour has to be overloaded by the derived classes.

Developer\'s note

The reason we have this function is that overloading a function in a derived class, hides all functions of the same name.

Reimplemented in stir::PoissonLogLikelihoodWithLinearModelForMeanAndProjData< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndGatedProjDataWithMotion< TargetT >, stir::PoissonLogLikelihoodWithLinearModelForMeanAndListModeDataWithProjMatrixByBin< TargetT >, and stir::PoissonLogLikelihoodWithLinearKineticModelAndDynamicProjectionData< TargetT >.

References stir::error().

The documentation for this class was generated from the following files:

/home/sirfuser/devel/STIRdistrib/STIR/src/include/stir/recon_buildblock/GeneralisedObjectiveFunction.h
/home/sirfuser/devel/STIRdistrib/STIR/src/recon_buildblock/GeneralisedObjectiveFunction.cxx

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

template<typename TargetT> class stir::GeneralisedObjectiveFunction< TargetT >

Member Function Documentation

◆ construct_target_ptr()

◆ compute_sub_gradient()

◆ compute_sub_gradient_without_penalty()

◆ compute_gradient()

◆ compute_gradient_without_penalty()

◆ compute_objective_function_without_penalty() [1/2]

◆ compute_objective_function_without_penalty() [2/2]

◆ compute_penalty() [1/2]

◆ compute_penalty() [2/2]

◆ compute_objective_function() [1/2]

◆ compute_objective_function() [2/2]

◆ fill_nonidentifiable_target_parameters()

◆ add_multiplication_with_approximate_sub_Hessian_without_penalty()

◆ accumulate_Hessian_times_input()

◆ set_num_subsets()

◆ subsets_are_approximately_balanced() [1/2]

◆ subsets_are_approximately_balanced() [2/2]

◆ get_prior_ptr()

◆ set_prior_sptr()

◆ set_input_data()

◆ get_input_data()

◆ set_additive_proj_data_sptr()

◆ set_normalisation_sptr()

◆ set_defaults()

◆ initialise_keymap()

◆ actual_subsets_are_approximately_balanced()

◆ actual_compute_objective_function_without_penalty()

◆ actual_add_multiplication_with_approximate_sub_Hessian_without_penalty()

◆ actual_accumulate_sub_Hessian_times_input_without_penalty()

template<typename TargetT>
class stir::GeneralisedObjectiveFunction< TargetT >