The OsiLPEngine engine uses the OSI interface to CLP solver. More...

#include <OsiLPEngine.h>

Inheritance diagram for Minotaur::OsiLPEngine:

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Collaboration diagram for Minotaur::OsiLPEngine:

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Public Member Functions
	OsiLPEngine (EnvPtr env)
	Constructor with an environment.

	~OsiLPEngine ()
	Destroy.

void	addConstraint (ConstraintPtr)
	Add a new constraint to the engine.

void	changeBound (ConstraintPtr cons, BoundType lu, double new_val)
	Change a bound of a constraint.

void	changeBound (VariablePtr var, BoundType lu, double new_val)
	Change a bound of a variable.

void	changeBound (VariablePtr var, double new_lb, double new_ub)
	Change both bounds of a variable.

void	changeConstraint (ConstraintPtr con, LinearFunctionPtr lf, double lb, double ub)
	Change the linear function, and the bounds of a constraint.

void	changeConstraint (ConstraintPtr c, NonlinearFunctionPtr nlf)
	Change the nonlinear function, and the bounds of a constraint.

void	changeObj (FunctionPtr f, double cb)
	Change objective function.

void	clear ()
	Clear the problem.

void	disableStrBrSetup ()
	Restore settings after strong branching.

EnginePtr	emptyCopy ()
	Return an empty OsiLPEngine pointer.

void	enableFactorization ()

void	disableFactorization ()

void	enableStrBrSetup ()
	Make settings for strong branching.

void	fillStats (std::vector< double > &)
	Accumulate statistics from different threads in a common data.

void	getBasics (int *index)

void	getBInvARow (int row, double z, double slack)

void	getBasisStatus (int cstat, int rstat)

const double *	getColLower ()

const double *	getColUpper ()

const double *	getRowLower ()

const double *	getRowUpper ()

const double *	getRightHandSide ()

int	getNumCols ()

int	getNumRows ()

const double *	getRowActivity ()

const double *	getOriginalTableau ()

const int *	getRowStarts ()

const int *	getIndicesofVars ()

const int *	getRowLength ()

double	getSolutionValue ()
	Return the solution value of the objective after solving the LP.

ConstSolutionPtr	getSolution ()
	Get the solution obtained after solving the problem.

EngineStatus	getStatus ()
	Get the status of the last solve command.

int	getIterationCount ()

std::string	getName () const
	Get the name.

ConstWarmStartPtr	getWarmStart ()
	Return the osilp interface. For hacks.

WarmStartPtr	getWarmStartCopy ()

bool	IsOptimalBasisAvailable ()

void	load (ProblemPtr problem)

void	loadFromWarmStart (const WarmStartPtr ws)

void	loadDualWarmStart (int size, double *dualVec)

void	negateObj ()
	Negate the objective function. Min f is changed to Min -f.

void	removeCons (std::vector< ConstraintPtr > &delcons)
	Delete constraints from the engine.

void	resetIterationLimit ()
	Reset the iteration limit to maximum possible.

void	setIterationLimit (int limit)

int	setDualObjLimit (double)
	Set the dual objective limit.

EngineStatus	solve ()

void	writeLP (const char *filename) const
	Writes an LP file of the loaded LP.

void	writeStats (std::ostream &out) const
	Write statistics.

Public Member Functions inherited from Minotaur::LPEngine
	LPEngine ()
	Constructor. May set default parameters/options here.

virtual	~LPEngine ()
	Destructor must be implemented if memory needs to be freed.

Public Member Functions inherited from Minotaur::Engine
	Engine ()
	Default constructor.

virtual	~Engine ()
	Destroy.

virtual std::string	getStatusString ()
	Return a string that describes the status in simple words.

virtual LoggerPtr	getLogger ()
	Return pointer to the log manager.

virtual void	setLogger (LoggerPtr logger)
	Set a new log manager.

virtual void	setOptionsForSingleSolve ()

virtual void	setOptionsForRepeatedSolve ()
	Set options to solve the NLP repeatedly, with few changes.

Additional Inherited Members
Protected Attributes inherited from Minotaur::Engine
EngineStatus	status_
	Status of the last solve.

LoggerPtr	logger_
	Keep log.

Detailed Description

The OsiLPEngine engine uses the OSI interface to CLP solver.

Member Function Documentation

◆ addConstraint()

void OsiLPEngine::addConstraint ( ConstraintPtr )

virtual

Add a new constraint to the engine.

Implements Minotaur::Engine.

◆ changeBound() [1/3]

void OsiLPEngine::changeBound	(	ConstraintPtr	cons,
		BoundType	lu,
		double	new_val
	)

virtual

Change a bound of a constraint.

Implements Minotaur::Engine.

◆ changeBound() [2/3]

void OsiLPEngine::changeBound	(	VariablePtr	var,
		BoundType	lu,
		double	new_val
	)

virtual

Change a bound of a variable.

Implements Minotaur::Engine.

◆ changeBound() [3/3]

void OsiLPEngine::changeBound	(	VariablePtr	var,
		double	new_lb,
		double	new_ub
	)

virtual

Change both bounds of a variable.

Implements Minotaur::Engine.

◆ changeConstraint() [1/2]

void OsiLPEngine::changeConstraint	(	ConstraintPtr	c,
		NonlinearFunctionPtr	nlf
	)

virtual

Change the nonlinear function, and the bounds of a constraint.

Parameters

[in]	c	Original constraint that is to be changed.
	[nlf]	The new nonlinear function.

Implements Minotaur::Engine.

◆ changeConstraint() [2/2]

void OsiLPEngine::changeConstraint	(	ConstraintPtr	c,
		LinearFunctionPtr	lf,
		double	lb,
		double	ub
	)

virtual

Change the linear function, and the bounds of a constraint.

Parameters

[in]	c	Original constraint that is to be changed.
	[lf]	The new linear function.
	[lb]	The new lower bound.
	[ub]	The new upper bound.

Implements Minotaur::Engine.

◆ changeObj()

void OsiLPEngine::changeObj	(	FunctionPtr	f,
		double	cb
	)

virtual

Change objective function.

Implements Minotaur::Engine.

◆ clear()

void OsiLPEngine::clear ( )

virtual

Clear the problem.

Implements Minotaur::Engine.

◆ disableFactorization()

void OsiLPEngine::disableFactorization ( )

virtual

Reimplemented from Minotaur::LPEngine.

◆ disableStrBrSetup()

void OsiLPEngine::disableStrBrSetup ( )

virtual

Restore settings after strong branching.

Implements Minotaur::Engine.

◆ emptyCopy()

EnginePtr OsiLPEngine::emptyCopy ( )

virtual

Return an empty OsiLPEngine pointer.

Reimplemented from Minotaur::Engine.

◆ enableFactorization()

void OsiLPEngine::enableFactorization ( )

virtual

Reimplemented from Minotaur::LPEngine.

◆ enableStrBrSetup()

void OsiLPEngine::enableStrBrSetup ( )

virtual

Make settings for strong branching.

Implements Minotaur::Engine.

◆ fillStats()

void OsiLPEngine::fillStats ( std::vector< double > & )

virtual

Accumulate statistics from different threads in a common data.

Reimplemented from Minotaur::Engine.

◆ getBasics()

void OsiLPEngine::getBasics ( int * index )

virtual

Reimplemented from Minotaur::LPEngine.

◆ getBInvARow()

void OsiLPEngine::getBInvARow	(	int	row,
		double *	z,
		double *	slack
	)

virtual

Reimplemented from Minotaur::LPEngine.

◆ getColLower()

const double * OsiLPEngine::getColLower ( )

virtual

Reimplemented from Minotaur::LPEngine.

◆ getColUpper()

const double * OsiLPEngine::getColUpper ( )

virtual

Reimplemented from Minotaur::LPEngine.

◆ getIndicesofVars()

const int * OsiLPEngine::getIndicesofVars ( )

virtual

Reimplemented from Minotaur::LPEngine.

◆ getIterationCount()

int OsiLPEngine::getIterationCount ( )

Return the number of iterations it took to solve the last problem.

◆ getName()

std::string OsiLPEngine::getName ( ) const

virtual

Get the name.

Implements Minotaur::Engine.

◆ getNumCols()

int OsiLPEngine::getNumCols ( )

virtual

Reimplemented from Minotaur::LPEngine.

◆ getNumRows()

int OsiLPEngine::getNumRows ( )

virtual

Reimplemented from Minotaur::LPEngine.

◆ getOriginalTableau()

const double * OsiLPEngine::getOriginalTableau ( )

virtual

Reimplemented from Minotaur::LPEngine.

◆ getRightHandSide()

const double * OsiLPEngine::getRightHandSide ( )

virtual

Reimplemented from Minotaur::LPEngine.

◆ getRowActivity()

const double * OsiLPEngine::getRowActivity ( )

virtual

Reimplemented from Minotaur::LPEngine.

◆ getRowLength()

const int * OsiLPEngine::getRowLength ( )

virtual

Reimplemented from Minotaur::LPEngine.

◆ getRowLower()

const double * OsiLPEngine::getRowLower ( )

virtual

Reimplemented from Minotaur::LPEngine.

◆ getRowStarts()

const int * OsiLPEngine::getRowStarts ( )

virtual

Reimplemented from Minotaur::LPEngine.

◆ getRowUpper()

const double * OsiLPEngine::getRowUpper ( )

virtual

Reimplemented from Minotaur::LPEngine.

◆ getSolution()

ConstSolutionPtr OsiLPEngine::getSolution ( )

virtual

Get the solution obtained after solving the problem.

Implements Minotaur::Engine.

◆ getSolutionValue()

double OsiLPEngine::getSolutionValue ( )

virtual

Return the solution value of the objective after solving the LP.

Implements Minotaur::Engine.

◆ getStatus()

EngineStatus OsiLPEngine::getStatus ( )

virtual

Get the status of the last solve command.

Implements Minotaur::Engine.

◆ getWarmStart()

ConstWarmStartPtr Minotaur::OsiLPEngine::getWarmStart ( )

inlinevirtual

Return the osilp interface. For hacks.

Implements Minotaur::Engine.

◆ getWarmStartCopy()

WarmStartPtr OsiLPEngine::getWarmStartCopy ( )

virtual

Get a full copy of warm start information from the engine. Does not change even if the engine starts solving something else later on.

Implements Minotaur::Engine.

◆ IsOptimalBasisAvailable()

bool OsiLPEngine::IsOptimalBasisAvailable ( )

virtual

Reimplemented from Minotaur::LPEngine.

◆ load()

void OsiLPEngine::load ( ProblemPtr problem )

virtual

Load the problem into the engine. We create arrays of variables and constraints, the A matrix, rhs, objective etc from the problem and initialize the LP solver.

Implements Minotaur::Engine.

◆ loadDualWarmStart()

void OsiLPEngine::loadDualWarmStart	(	int	size,
		double *	dualVec
	)

virtual

Reimplemented from Minotaur::LPEngine.

◆ loadFromWarmStart()

void OsiLPEngine::loadFromWarmStart ( const WarmStartPtr ws )

virtual

Use warm start information for solving the next problem. May Create a copy of WarmStart and use the copy inside the engine; the copy (but not the original) gets updated after solving a relaxation.

Implements Minotaur::Engine.

◆ negateObj()

void OsiLPEngine::negateObj ( )

virtual

Negate the objective function. Min f is changed to Min -f.

Implements Minotaur::Engine.

◆ removeCons()

void OsiLPEngine::removeCons ( std::vector< ConstraintPtr > & delcons )

virtual

Delete constraints from the engine.

Parameters

[in] delcons A vector of constraint pointers that should be deleted from the engine.

Implements Minotaur::Engine.

◆ resetIterationLimit()

void OsiLPEngine::resetIterationLimit ( )

virtual

Reset the iteration limit to maximum possible.

Implements Minotaur::Engine.

◆ setDualObjLimit()

int Minotaur::OsiLPEngine::setDualObjLimit ( double )

inlinevirtual

Set the dual objective limit.

Implements Minotaur::Engine.

◆ setIterationLimit()

void OsiLPEngine::setIterationLimit ( int limit )

virtual

Set a limit on number of iterations. For strong-branching, for instance.

Implements Minotaur::Engine.

◆ solve()

EngineStatus OsiLPEngine::solve ( )

virtual

Solve the problem that was loaded. Calls resolve() function of Osi. The resolve() function `‘smartly’' decides what method of clp should be called.

Implements Minotaur::Engine.

◆ writeStats()

void OsiLPEngine::writeStats ( std::ostream & out ) const

virtual

Write statistics.

Reimplemented from Minotaur::Engine.

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

/home/amahajan/tmp/minotaur-test/src/interfaces/OsiLPEngine.h
/home/amahajan/tmp/minotaur-test/src/interfaces/OsiLPEngine.cpp

Public Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ addConstraint()

◆ changeBound() [1/3]

◆ changeBound() [2/3]

◆ changeBound() [3/3]

◆ changeConstraint() [1/2]

◆ changeConstraint() [2/2]

◆ changeObj()

◆ clear()

◆ disableFactorization()

◆ disableStrBrSetup()

◆ emptyCopy()

◆ enableFactorization()

◆ enableStrBrSetup()

◆ fillStats()

◆ getBasics()

◆ getBInvARow()

◆ getColLower()

◆ getColUpper()

◆ getIndicesofVars()

◆ getIterationCount()

◆ getName()

◆ getNumCols()

◆ getNumRows()

◆ getOriginalTableau()

◆ getRightHandSide()

◆ getRowActivity()

◆ getRowLength()

◆ getRowLower()

◆ getRowStarts()

◆ getRowUpper()

◆ getSolution()

◆ getSolutionValue()

◆ getStatus()

◆ getWarmStart()

◆ getWarmStartCopy()

◆ IsOptimalBasisAvailable()

◆ load()

◆ loadDualWarmStart()

◆ loadFromWarmStart()

◆ negateObj()

◆ removeCons()

◆ resetIterationLimit()

◆ setDualObjLimit()

◆ setIterationLimit()

◆ solve()

◆ writeStats()