Provides the interface to compute optimization steps with the gradient descent method globalized using line search. More...

#include <ROL_GradientStep.hpp>

Inheritance diagram for ROL::GradientStep< Real >:

Public Member Functions
	GradientStep (ROL::ParameterList &parlist, const bool computeObj=true)
	Constructor. More...

void	compute (Vector< Real > &s, const Vector< Real > &x, Objective< Real > &obj, BoundConstraint< Real > &bnd, AlgorithmState< Real > &algo_state)
	Compute step. More...

void	update (Vector< Real > &x, const Vector< Real > &s, Objective< Real > &obj, BoundConstraint< Real > &con, AlgorithmState< Real > &algo_state)
	Update step, if successful. More...

std::string	printHeader (void) const
	Print iterate header. More...

std::string	printName (void) const
	Print step name. More...

std::string	print (AlgorithmState< Real > &algo_state, bool print_header=false) const
	Print iterate status. More...

Public Member Functions inherited from ROL::Step< Real >
virtual	~Step ()

	Step (void)

virtual void	initialize (Vector< Real > &x, const Vector< Real > &g, Objective< Real > &obj, BoundConstraint< Real > &con, AlgorithmState< Real > &algo_state)
	Initialize step with bound constraint. More...

virtual void	initialize (Vector< Real > &x, const Vector< Real > &s, const Vector< Real > &g, Objective< Real > &obj, BoundConstraint< Real > &con, AlgorithmState< Real > &algo_state)
	Initialize step with bound constraint. More...

virtual void	initialize (Vector< Real > &x, const Vector< Real > &g, Vector< Real > &l, const Vector< Real > &c, Objective< Real > &obj, Constraint< Real > &con, AlgorithmState< Real > &algo_state)
	Initialize step with equality constraint. More...

virtual void	initialize (Vector< Real > &x, const Vector< Real > &g, Vector< Real > &l, const Vector< Real > &c, Objective< Real > &obj, Constraint< Real > &con, BoundConstraint< Real > &bnd, AlgorithmState< Real > &algo_state)
	Initialize step with equality constraint. More...

virtual void	compute (Vector< Real > &s, const Vector< Real > &x, const Vector< Real > &l, Objective< Real > &obj, Constraint< Real > &con, AlgorithmState< Real > &algo_state)
	Compute step (equality constraints). More...

virtual void	update (Vector< Real > &x, Vector< Real > &l, const Vector< Real > &s, Objective< Real > &obj, Constraint< Real > &con, AlgorithmState< Real > &algo_state)
	Update step, if successful (equality constraints). More...

virtual void	compute (Vector< Real > &s, const Vector< Real > &x, const Vector< Real > &l, Objective< Real > &obj, Constraint< Real > &con, BoundConstraint< Real > &bnd, AlgorithmState< Real > &algo_state)
	Compute step (equality constraints). More...

virtual void	update (Vector< Real > &x, Vector< Real > &l, const Vector< Real > &s, Objective< Real > &obj, Constraint< Real > &con, BoundConstraint< Real > &bnd, AlgorithmState< Real > &algo_state)
	Update step, if successful (equality constraints). More...

void	initialize (OptimizationProblem< Real > &opt, AlgorithmState< Real > &algo_state)

void	compute (Vector< Real > &s, OptimizationProblem< Real > &opt, AlgorithmState< Real > &algo_state)

void	update (OptimizationProblem< Real > &opt, const Vector< Real > &s, AlgorithmState< Real > &algo_state)

const ROL::Ptr< const StepState< Real > >	getStepState (void) const
	Get state for step object. More...

void	reset (const Real searchSize=1.0)
	Get state for step object. More...

Private Attributes
int	verbosity_
	Verbosity setting. More...

const bool	computeObj_
	Allows line search to compute objective. More...

Additional Inherited Members
Protected Member Functions inherited from ROL::Step< Real >
ROL::Ptr< StepState< Real > >	getState (void)

Detailed Description

template<class Real>
class ROL::GradientStep< Real >

Provides the interface to compute optimization steps with the gradient descent method globalized using line search.

Definition at line 60 of file ROL_GradientStep.hpp.

Constructor & Destructor Documentation

template<class Real >

ROL::GradientStep< Real >::GradientStep	(	ROL::ParameterList &	parlist,
		const bool	computeObj = `true`
	)

inline

Constructor.

Constructor to build a GradientStep object. Algorithmic specifications are passed in through a ROL::ParameterList.

Parameters

[in] parlist is a parameter list containing algorithmic specifications

Definition at line 79 of file ROL_GradientStep.hpp.

References ROL::GradientStep< Real >::verbosity_.

Member Function Documentation

template<class Real >

void ROL::GradientStep< Real >::compute	(	Vector< Real > &	s,
		const Vector< Real > &	x,
		Objective< Real > &	obj,
		BoundConstraint< Real > &	bnd,
		AlgorithmState< Real > &	algo_state
	)

inlinevirtual

Compute step.

Reimplemented from ROL::Step< Real >.

Definition at line 85 of file ROL_GradientStep.hpp.

References ROL::Step< Real >::getState(), ROL::Vector< Real >::scale(), and ROL::Vector< Real >::set().

template<class Real >

void ROL::GradientStep< Real >::update	(	Vector< Real > &	x,
		const Vector< Real > &	s,
		Objective< Real > &	obj,
		BoundConstraint< Real > &	bnd,
		AlgorithmState< Real > &	algo_state
	)