Abstract base class and concrete factories that define multi-shapelet galaxy models. More...

#include <Model.h>

Inheritance diagram for lsst::meas::modelfit::Model:

Public Types
enum	CenterEnum { FIXED_CENTER = 0x0 , SINGLE_CENTER = 0x1 , MULTI_CENTER = 0x2 }

typedef std::vector< std::string >	NameVector

typedef std::vector< std::shared_ptr< shapelet::MultiShapeletBasis > >	BasisVector

typedef std::vector< afw::geom::ellipses::Ellipse >	EllipseVector

typedef std::vector< afw::geom::ellipses::Ellipse >::iterator	EllipseIterator

typedef std::vector< afw::geom::ellipses::Ellipse >::const_iterator	EllipseConstIterator

Public Member Functions
int	getNonlinearDim () const
	Return the number of free nonlinear parameters.

int	getAmplitudeDim () const
	Return the number of linear parameters.

int	getFixedDim () const
	Return the number of fixed nonlinear parameters.

int	getBasisCount () const
	Return the number of MultiShapeletBasis objects (equivalently, the number of ellipses)

NameVector const &	getNonlinearNames () const
	Return the names of the free nonlinear parameters.

NameVector const &	getAmplitudeNames () const
	Return the names of the amplitude parameters.

NameVector const &	getFixedNames () const
	Return the names of the fixed nonlinear parameters.

BasisVector const &	getBasisVector () const
	Return the MultiShapeletBasis objects that comprise the Model.

shapelet::MultiShapeletFunction	makeShapeletFunction (ndarray::Array< Scalar const, 1, 1 > const &nonlinear, ndarray::Array< Scalar const, 1, 1 > const &amplitudes, ndarray::Array< Scalar const, 1, 1 > const &fixed) const
	Create a MultiShapeletFunction object from a set of parameter vectors.

virtual std::shared_ptr< Prior >	adaptPrior (std::shared_ptr< Prior > prior) const =0
	Given an arbitrary prior, return one compatible with this Model or throw LogicError.

virtual EllipseVector	makeEllipseVector () const =0
	Return an uninitialized vector of afw::geom::ellipses::Ellipse with the parametrization expected by readEllipses() and writeEllipses().

virtual void	writeEllipses (Scalar const nonlinearIter, Scalar const fixedIter, EllipseIterator ellipseIter) const =0
	Convert a set of nonlinear+fixed parameter arrays to a vector of ellipses.

virtual void	readEllipses (EllipseConstIterator ellipseIter, Scalar nonlinearIter, Scalar fixedIter) const =0
	Convert a vector of ellipses to a set of nonlinear+fixed parameter arrays.

EllipseVector	writeEllipses (ndarray::Array< Scalar const, 1, 1 > const &nonlinear, ndarray::Array< Scalar const, 1, 1 > const &fixed) const
	Convert a set of nonlinear+fixed parameter arrays to a vector of ellipses.

void	readEllipses (EllipseVector const &ellipses, ndarray::Array< Scalar, 1, 1 > const &nonlinear, ndarray::Array< Scalar, 1, 1 > const &fixed) const
	Convert a vector of ellipses to a set of nonlinear+fixed parameter arrays.

virtual void	transformParameters (LocalUnitTransform const &transform, ndarray::Array< Scalar, 1, 1 > const &nonlinear, ndarray::Array< Scalar, 1, 1 > const &amplitudes, ndarray::Array< Scalar, 1, 1 > const &fixed) const
	Transform (in-place) parameter vectors from one unit system to another.

virtual	~Model ()

	Model (const Model &)=delete

Model &	operator= (const Model &)=delete

	Model (Model &&)=delete

Model &	operator= (Model &&)=delete

Static Public Member Functions
static std::shared_ptr< Model >	make (BasisVector basisVector, NameVector const &prefixes, CenterEnum center)
	Construct a concrete Model instance with multiple ellipses and multishapelet bases.

static std::shared_ptr< Model >	make (std::shared_ptr< shapelet::MultiShapeletBasis > basis, CenterEnum center)
	Construct a concrete Model instance with a single ellipse and multishapelet basis.

static std::shared_ptr< Model >	makeGaussian (CenterEnum center, double radius=1.0)
	Construct a concrete Model instance that represents a single elliptical Gaussian function.

Protected Member Functions
	Model (BasisVector basisVector, NameVector nonlinearNames, NameVector amplitudeNames, NameVector fixedNames)

Detailed Description

Abstract base class and concrete factories that define multi-shapelet galaxy models.

A Model provides a mapping from its parameters to ellipses and to a realization using shapelet objects. A Model does not "hold" its parameters; parameters are always stored in separate arrays.

Model parameters are split into three categories: nonlinear, amplitudes, and fixed. These are described more fully in Models, Interpreters, and Parameters.

A few private concrete subclasses of Model have been provided that will meet most needs; instances can be constructed via the make() and makeGaussian()

Definition at line 56 of file Model.h.

Member Typedef Documentation

◆ BasisVector

typedef std::vector<std::shared_ptr<shapelet::MultiShapeletBasis> > lsst::meas::modelfit::Model::BasisVector

Definition at line 66 of file Model.h.

◆ EllipseConstIterator

typedef std::vector<afw::geom::ellipses::Ellipse>::const_iterator lsst::meas::modelfit::Model::EllipseConstIterator

Definition at line 69 of file Model.h.

◆ EllipseIterator

typedef std::vector<afw::geom::ellipses::Ellipse>::iterator lsst::meas::modelfit::Model::EllipseIterator

Definition at line 68 of file Model.h.

◆ EllipseVector

typedef std::vector<afw::geom::ellipses::Ellipse> lsst::meas::modelfit::Model::EllipseVector

Definition at line 67 of file Model.h.

◆ NameVector

typedef std::vector<std::string> lsst::meas::modelfit::Model::NameVector

Definition at line 65 of file Model.h.

Member Enumeration Documentation

◆ CenterEnum

enum lsst::meas::modelfit::Model::CenterEnum

Enumerator
FIXED_CENTER
SINGLE_CENTER
MULTI_CENTER

Definition at line 59 of file Model.h.

                    {
        FIXED_CENTER  = 0x0,
        SINGLE_CENTER = 0x1,
        MULTI_CENTER  = 0x2
    };

Constructor & Destructor Documentation

◆ ~Model()

virtual lsst::meas::modelfit::Model::~Model ( )

inlinevirtual

Definition at line 251 of file Model.h.

251{}

◆ Model() [1/3]

lsst::meas::modelfit::Model::Model ( const Model & )

delete

◆ Model() [2/3]

lsst::meas::modelfit::Model::Model ( Model && )

delete

◆ Model() [3/3]

lsst::meas::modelfit::Model::Model	(	BasisVector	basisVector,
		NameVector	nonlinearNames,
		NameVector	amplitudeNames,
		NameVector	fixedNames )

protected

Member Function Documentation

◆ adaptPrior()

virtual std::shared_ptr< Prior > lsst::meas::modelfit::Model::adaptPrior ( std::shared_ptr< Prior > prior ) const

pure virtual

Given an arbitrary prior, return one compatible with this Model or throw LogicError.

Implemented in lsst::meas::modelfit::MultiModel.

◆ getAmplitudeDim()

int lsst::meas::modelfit::Model::getAmplitudeDim ( ) const

inline

Return the number of linear parameters.

Definition at line 127 of file Model.h.

127{ return _amplitudeNames.size(); }

std::vector::size

T size(T... args)

◆ getAmplitudeNames()

NameVector const & lsst::meas::modelfit::Model::getAmplitudeNames ( ) const

inline

Return the names of the amplitude parameters.

Definition at line 139 of file Model.h.

139{ return _amplitudeNames; }

◆ getBasisCount()

int lsst::meas::modelfit::Model::getBasisCount ( ) const

inline

Return the number of MultiShapeletBasis objects (equivalently, the number of ellipses)

Definition at line 133 of file Model.h.

133{ return _basisVector.size(); }

◆ getBasisVector()

BasisVector const & lsst::meas::modelfit::Model::getBasisVector ( ) const

inline

Return the MultiShapeletBasis objects that comprise the Model.

Definition at line 145 of file Model.h.

145{ return _basisVector; }

◆ getFixedDim()

int lsst::meas::modelfit::Model::getFixedDim ( ) const

inline

Return the number of fixed nonlinear parameters.

Definition at line 130 of file Model.h.

130{ return _fixedNames.size(); }

◆ getFixedNames()

NameVector const & lsst::meas::modelfit::Model::getFixedNames ( ) const

inline

Return the names of the fixed nonlinear parameters.

Definition at line 142 of file Model.h.

142{ return _fixedNames; }

◆ getNonlinearDim()

int lsst::meas::modelfit::Model::getNonlinearDim ( ) const

inline

Return the number of free nonlinear parameters.

Definition at line 124 of file Model.h.

124{ return _nonlinearNames.size(); }

◆ getNonlinearNames()

NameVector const & lsst::meas::modelfit::Model::getNonlinearNames ( ) const

inline

Return the names of the free nonlinear parameters.

Definition at line 136 of file Model.h.

136{ return _nonlinearNames; }

◆ make() [1/2]

static std::shared_ptr< Model > lsst::meas::modelfit::Model::make	(	BasisVector	basisVector,
		NameVector const &	prefixes,
		CenterEnum	center )

static

Construct a concrete Model instance with multiple ellipses and multishapelet bases.

This can be used to construct a multi-component model (for instance, a bulge-disk decomposition), using MultiShapeletBasis objects such as those loaded by the lsst.shapelet.tractor module.

Parameters

[in]	basisVector	A vector of MultiShapeletBasis objects, one for each component. Each component will have a separate set of ellipse parameters.
[in]	prefixes	A vector of parameter name prefixes, one for each basis. These will be prepended to the names described in the documentation for the other overload of make().
[in]	center	An enum specifying whether the different components should have a fixed center (FIXED_CENTER), the same center (SINGLE_CENTER), or independent centers (MULTI_CENTER).

◆ make() [2/2]

static std::shared_ptr< Model > lsst::meas::modelfit::Model::make	(	std::shared_ptr< shapelet::MultiShapeletBasis >	basis,
		CenterEnum	center )

static

Construct a concrete Model instance with a single ellipse and multishapelet basis.

This can be used to construct a single-component model (e.g. a single fixed-index Sersic profile), or a linear combination model with only one ellipse.

Parameters

[in]	basis	A MultiShapeletBasis object, of the sort provided by the lsst.shapelet.tractor module.
[in]	center	An enum specifying whether the model should have a fixed center (FIXED_CENTER) or parametrized center (SINGLE_CENTER or MULTI_CENTER).

The names of the nonlinear and fixed parameters will be ["eta1", "eta2", "logR", "x", "y"], with "x" and "y" in the fixed parameters if center==FIXED_CENTER. The amplitudes will be labeled "alphaN", where "N" is an integer starting from 0.

As implied by the parameter names, the ellipse is parametrized using afw::geom::ellipses::SeparableConformalShearLogTraceRadius. For the basis objects provided by lsst.shapelet.tractor, that generally means that logR=0 corresponds to the half-light radius.

◆ makeEllipseVector()

virtual EllipseVector lsst::meas::modelfit::Model::makeEllipseVector ( ) const

pure virtual

Return an uninitialized vector of afw::geom::ellipses::Ellipse with the parametrization expected by readEllipses() and writeEllipses().

Implemented in lsst::meas::modelfit::MultiModel.

◆ makeGaussian()

static std::shared_ptr< Model > lsst::meas::modelfit::Model::makeGaussian	(	CenterEnum	center,
		double	radius = 1.0 )

static

Construct a concrete Model instance that represents a single elliptical Gaussian function.

The Models returned by this method use the same ellipse parametrization and naming schemes as those returned by make().

Parameters

[in]	center	An enum specifying whether the model should have a fixed center (FIXED_CENTER) or parametrized center (SINGLE_CENTER or MULTI_CENTER).
[in]	radius	The radius at which logR=0, in units of the Gaussian sigma parameter (i.e. radius=1 corresponds to a model in which the radius parameter is ln(sigma)).

◆ makeShapeletFunction()

shapelet::MultiShapeletFunction lsst::meas::modelfit::Model::makeShapeletFunction	(	ndarray::Array< Scalar const, 1, 1 > const &	nonlinear,
		ndarray::Array< Scalar const, 1, 1 > const &	amplitudes,
		ndarray::Array< Scalar const, 1, 1 > const &	fixed ) const

Create a MultiShapeletFunction object from a set of parameter vectors.

◆ operator=() [1/2]

Model & lsst::meas::modelfit::Model::operator= ( const Model & )

delete

◆ operator=() [2/2]

Model & lsst::meas::modelfit::Model::operator= ( Model && )

delete

◆ readEllipses() [1/2]

virtual void lsst::meas::modelfit::Model::readEllipses	(	EllipseConstIterator	ellipseIter,
		Scalar *	nonlinearIter,
		Scalar *	fixedIter ) const

pure virtual

Convert a vector of ellipses to a set of nonlinear+fixed parameter arrays.

Parameters

[in]	ellipseIter	Iterator to the beginning of an ellipse vector, as returned by makeEllipseVector().
[out]	nonlinearIter	Pointer to the beginning of a nonlinear parameter array.
[out]	fixedIter	Pointer to the beginning of a fixed parameter array.

Warning: The ellipse iterator must point to an EllipseVector originally constructed by makeEllipseVector(); Calling writeEllipses() followed by readEllipses() does not guarantee that that the parameters on output will be the same as those on input, as the parameters may be degenerate. However, calling readEllipses() followed by writeEllipses() is guaranteed to round-trip the ellipses.

Implemented in lsst::meas::modelfit::MultiModel.

◆ readEllipses() [2/2]

void lsst::meas::modelfit::Model::readEllipses	(	EllipseVector const &	ellipses,
		ndarray::Array< Scalar, 1, 1 > const &	nonlinear,
		ndarray::Array< Scalar, 1, 1 > const &	fixed ) const

Convert a vector of ellipses to a set of nonlinear+fixed parameter arrays.

Parameters

[in]	ellipses	An ellipse vector, as returned by makeEllipseVector().
[out]	nonlinear	Output nonlinear parameter array.
[out]	fixed	Output fixed parameter array.

Warning: The EllipseVector must have been originally constructed by makeEllipseVector()

◆ transformParameters()

virtual void lsst::meas::modelfit::Model::transformParameters	(	LocalUnitTransform const &	transform,
		ndarray::Array< Scalar, 1, 1 > const &	nonlinear,
		ndarray::Array< Scalar, 1, 1 > const &	amplitudes,
		ndarray::Array< Scalar, 1, 1 > const &	fixed ) const

virtual

Transform (in-place) parameter vectors from one unit system to another.

The default implementation transforms nonlinear and fixed parameters by converting them to ellipses, transforming the ellipses, and converting back to parameters. The amplitudes are simply multiplied by transform.flux. Subclasses for which this isn't appropriate should override.

◆ writeEllipses() [1/2]

EllipseVector lsst::meas::modelfit::Model::writeEllipses	(	ndarray::Array< Scalar const, 1, 1 > const &	nonlinear,
		ndarray::Array< Scalar const, 1, 1 > const &	fixed ) const

Convert a set of nonlinear+fixed parameter arrays to a vector of ellipses.

Parameters

[in]	nonlinear	nonlinear parameter array.
[in]	fixed	fixed parameter array.

This is a convenient method that combines the call to makeEllipseVector() with a call to the other overload of writeEllipses(), for cases when there is no need to reuse an existing ellipse vector.

◆ writeEllipses() [2/2]

virtual void lsst::meas::modelfit::Model::writeEllipses	(	Scalar const *	nonlinearIter,
		Scalar const *	fixedIter,
		EllipseIterator	ellipseIter ) const

pure virtual

Convert a set of nonlinear+fixed parameter arrays to a vector of ellipses.

Parameters

[in]	nonlinearIter	Pointer to the beginning of a nonlinear parameter array.
[in]	fixedIter	Pointer to the beginning of a fixed parameter array.
[out]	ellipseIter	Iterator to the beginning of an ellipse vector, as returned by makeEllipseVector().

Warning: The ellipse iterator must point to an EllipseVector originally constructed by makeEllipseVector(); Calling writeEllipses() followed by readEllipses() does not guarantee that that the parameters on output will be the same as those on input, as the parameters may be degenerate. However, calling readEllipses() followed by writeEllipses() is guaranteed to round-trip the ellipses.

Implemented in lsst::meas::modelfit::MultiModel.

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

/j/snowflake/release/lsstsw/stack/lsst-scipipe-8.0.0/Linux64/meas_modelfit/g591dd9f2cf+b2918d57ae/include/lsst/meas/modelfit/Model.h

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Detailed Description

Member Typedef Documentation

◆ BasisVector

◆ EllipseConstIterator

◆ EllipseIterator

◆ EllipseVector

◆ NameVector

Member Enumeration Documentation

◆ CenterEnum

Constructor & Destructor Documentation

◆ ~Model()

◆ Model() [1/3]

◆ Model() [2/3]

◆ Model() [3/3]

Member Function Documentation

◆ adaptPrior()

◆ getAmplitudeDim()

◆ getAmplitudeNames()

◆ getBasisCount()

◆ getBasisVector()

◆ getFixedDim()

◆ getFixedNames()

◆ getNonlinearDim()

◆ getNonlinearNames()

◆ make() [1/2]

◆ make() [2/2]

◆ makeEllipseVector()

◆ makeGaussian()

◆ makeShapeletFunction()

◆ operator=() [1/2]

◆ operator=() [2/2]

◆ readEllipses() [1/2]

◆ readEllipses() [2/2]

◆ transformParameters()

◆ writeEllipses() [1/2]

◆ writeEllipses() [2/2]