ROL
Public Member Functions | Private Attributes | List of all members
ROL::GradientStep< Real > Class Template Reference

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...
 
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 26 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]parlistis a parameter list containing algorithmic specifications

Definition at line 45 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 51 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 
)
inlinevirtual
template<class Real >
std::string ROL::GradientStep< Real >::printHeader ( void  ) const
inlinevirtual

Print iterate header.

Reimplemented from ROL::Step< Real >.

Definition at line 87 of file ROL_GradientStep.hpp.

References ROL::DESCENT_STEEPEST, ROL::EDescentToString(), and ROL::GradientStep< Real >::verbosity_.

Referenced by ROL::GradientStep< Real >::print().

template<class Real >
std::string ROL::GradientStep< Real >::printName ( void  ) const
inlinevirtual

Print step name.

Reimplemented from ROL::Step< Real >.

Definition at line 113 of file ROL_GradientStep.hpp.

References ROL::DESCENT_STEEPEST, and ROL::EDescentToString().

Referenced by ROL::GradientStep< Real >::print().

template<class Real >
std::string ROL::GradientStep< Real >::print ( AlgorithmState< Real > &  algo_state,
bool  printHeader = false 
) const
inlinevirtual

Member Data Documentation

template<class Real >
int ROL::GradientStep< Real >::verbosity_
private

Verbosity setting.

Definition at line 29 of file ROL_GradientStep.hpp.

Referenced by ROL::GradientStep< Real >::GradientStep(), and ROL::GradientStep< Real >::printHeader().

template<class Real >
const bool ROL::GradientStep< Real >::computeObj_
private

Allows line search to compute objective.

Definition at line 30 of file ROL_GradientStep.hpp.

Referenced by ROL::GradientStep< Real >::update().


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