Approximates the gradient by taking samples from an ensemble of Markov chains running in parallel. More...

#include <shark/Unsupervised/RBM/GradientApproximations/MultiChainApproximator.h>

Inheritance diagram for shark::MultiChainApproximator< MarkovChainType >:

Public Types
typedef MarkovChainType::RBM	RBM

Public Types inherited from shark::AbstractObjectiveFunction< PointType, ResultT >
enum	Feature { HAS_VALUE = 1, HAS_FIRST_DERIVATIVE = 2, HAS_SECOND_DERIVATIVE = 4, CAN_PROPOSE_STARTING_POINT = 8, IS_CONSTRAINED_FEATURE = 16, HAS_CONSTRAINT_HANDLER = 32, CAN_PROVIDE_CLOSEST_FEASIBLE = 64, IS_THREAD_SAFE = 128, IS_NOISY = 256 }
	List of features that are supported by an implementation. More...

typedef PointType	SearchPointType

typedef ResultT	ResultType

typedef boost::mpl::if_< std::is_arithmetic< ResultT >, SearchPointType, RealMatrix >::type	FirstOrderDerivative

typedef TypedFlags< Feature >	Features
	This statement declares the member m_features. See Core/Flags.h for details. More...

typedef TypedFeatureNotAvailableException< Feature >	FeatureNotAvailableException

Public Member Functions
	MultiChainApproximator (RBM *rbm)

std::string	name () const
	From INameable: return the class name. More...

void	setK (unsigned int k)

void	setNumberOfSamples (std::size_t samples)

void	setBatchSize (std::size_t batchSize)

MarkovChainType &	chain ()

MarkovChainType const &	chain () const

std::size_t	numBatches () const
	Returns the number of batches of the dataset that are used in every iteration. More...

std::size_t &	numBatches ()
	Returns a reference to the number of batches of the dataset that are used in every iteration. More...

void	setData (UnlabeledData< RealVector > const &data)

SearchPointType	proposeStartingPoint () const
	Proposes a starting point in the feasible search space of the function. More...

std::size_t	numberOfVariables () const
	Accesses the number of variables. More...

void	setRegularizer (double factor, SingleObjectiveFunction *regularizer)

double	evalDerivative (SearchPointType const &parameter, FirstOrderDerivative &derivative) const
	Evaluates the objective function and calculates its gradient. More...

Public Member Functions inherited from shark::AbstractObjectiveFunction< PointType, ResultT >
const Features &	features () const

virtual void	updateFeatures ()

bool	hasValue () const
	returns whether this function can calculate it's function value More...

bool	hasFirstDerivative () const
	returns whether this function can calculate the first derivative More...

bool	hasSecondDerivative () const
	returns whether this function can calculate the second derivative More...

bool	canProposeStartingPoint () const
	returns whether this function can propose a starting point. More...

bool	isConstrained () const
	returns whether this function can return More...

bool	hasConstraintHandler () const
	returns whether this function can return More...

bool	canProvideClosestFeasible () const
	Returns whether this function can calculate thee closest feasible to an infeasible point. More...

bool	isThreadSafe () const
	Returns true, when the function can be usd in parallel threads. More...

bool	isNoisy () const
	Returns true, when the function can be usd in parallel threads. More...

	AbstractObjectiveFunction ()
	Default ctor. More...

virtual	~AbstractObjectiveFunction ()
	Virtual destructor. More...

virtual void	init ()

void	setRng (random::rng_type *rng)
	Sets the Rng used by the objective function. More...

virtual bool	hasScalableDimensionality () const

virtual void	setNumberOfVariables (std::size_t numberOfVariables)
	Adjusts the number of variables if the function is scalable. More...

virtual std::size_t	numberOfObjectives () const

virtual bool	hasScalableObjectives () const

virtual void	setNumberOfObjectives (std::size_t numberOfObjectives)
	Adjusts the number of objectives if the function is scalable. More...

std::size_t	evaluationCounter () const
	Accesses the evaluation counter of the function. More...

AbstractConstraintHandler< SearchPointType > const &	getConstraintHandler () const
	Returns the constraint handler of the function if it has one. More...

virtual bool	isFeasible (const SearchPointType &input) const
	Tests whether a point in SearchSpace is feasible, e.g., whether the constraints are fulfilled. More...

virtual void	closestFeasible (SearchPointType &input) const
	If supported, the supplied point is repaired such that it satisfies all of the function's constraints. More...

virtual ResultType	eval (SearchPointType const &input) const
	Evaluates the objective function for the supplied argument. More...

ResultType	operator() (SearchPointType const &input) const
	Evaluates the function. Useful together with STL-Algorithms like std::transform. More...

virtual ResultType	evalDerivative (SearchPointType const &input, SecondOrderDerivative &derivative) const
	Evaluates the objective function and calculates its gradient. More...

Public Member Functions inherited from shark::INameable
virtual	~INameable ()

Additional Inherited Members
Protected Member Functions inherited from shark::AbstractObjectiveFunction< PointType, ResultT >
void	announceConstraintHandler (AbstractConstraintHandler< SearchPointType > const *handler)
	helper function which is called to announce the presence of an constraint handler. More...

Protected Attributes inherited from shark::AbstractObjectiveFunction< PointType, ResultT >
Features	m_features

std::size_t	m_evaluationCounter
	Evaluation counter, default value: 0. More...

AbstractConstraintHandler< SearchPointType > const *	m_constraintHandler

random::rng_type *	mep_rng

Detailed Description

template<class MarkovChainType>
class shark::MultiChainApproximator< MarkovChainType >

Approximates the gradient by taking samples from an ensemble of Markov chains running in parallel.

The advantage is, that every chain can produce samples of a different mode of the distribution. The disadvantage is however, that mixing is slower and a higher value of sampling steps between subsequent samples need to be chosen.

Definition at line 44 of file MultiChainApproximator.h.

Member Typedef Documentation

◆ RBM

template<class MarkovChainType >

typedef MarkovChainType::RBM shark::MultiChainApproximator< MarkovChainType >::RBM

Definition at line 46 of file MultiChainApproximator.h.

Constructor & Destructor Documentation

◆ MultiChainApproximator()

template<class MarkovChainType >

shark::MultiChainApproximator< MarkovChainType >::MultiChainApproximator ( RBM * rbm )

inline

Definition at line 48 of file MultiChainApproximator.h.

References shark::AbstractObjectiveFunction< PointType, ResultT >::CAN_PROPOSE_STARTING_POINT, shark::AbstractObjectiveFunction< PointType, ResultT >::HAS_FIRST_DERIVATIVE, shark::AbstractObjectiveFunction< PointType, ResultT >::HAS_VALUE, shark::AbstractObjectiveFunction< PointType, ResultT >::m_features, shark::TypedFlags< Flag >::reset(), shark::MultiChainApproximator< MarkovChainType >::setBatchSize(), and SHARK_ASSERT.

Member Function Documentation

◆ chain() [1/2]

template<class MarkovChainType >

MarkovChainType& shark::MultiChainApproximator< MarkovChainType >::chain ( )

inline

Definition at line 74 of file MultiChainApproximator.h.

◆ chain() [2/2]

template<class MarkovChainType >

MarkovChainType const& shark::MultiChainApproximator< MarkovChainType >::chain ( ) const

inline

Definition at line 77 of file MultiChainApproximator.h.

◆ evalDerivative()

template<class MarkovChainType >

double shark::MultiChainApproximator< MarkovChainType >::evalDerivative	(	SearchPointType const &	input,
		FirstOrderDerivative &	derivative
	)		const

inlinevirtual

Evaluates the objective function and calculates its gradient.

Parameters

[in]	input	The argument to eval the function for.
[out]	derivative	The derivate is placed here.

Returns: The result of evaluating the function for the supplied argument.

Exceptions

FeatureNotAvailableException in the default implementation and if a function does not support this feature.

Reimplemented from shark::AbstractObjectiveFunction< PointType, ResultT >.

Definition at line 136 of file MultiChainApproximator.h.

References shark::swap().

◆ name()

template<class MarkovChainType >

std::string shark::MultiChainApproximator< MarkovChainType >::name ( ) const

inlinevirtual

From INameable: return the class name.

Reimplemented from shark::INameable.

Definition at line 59 of file MultiChainApproximator.h.

◆ numBatches() [1/2]

template<class MarkovChainType >

std::size_t shark::MultiChainApproximator< MarkovChainType >::numBatches ( ) const

inline

Returns the number of batches of the dataset that are used in every iteration.

If it is less than all batches, the batches are chosen at random. if it is 0, all batches are used

Definition at line 84 of file MultiChainApproximator.h.

◆ numBatches() [2/2]

template<class MarkovChainType >

std::size_t& shark::MultiChainApproximator< MarkovChainType >::numBatches ( )

inline

Returns a reference to the number of batches of the dataset that are used in every iteration.

If it is less than all batches, the batches are chosen at random.if it is 0, all batches are used.

Definition at line 91 of file MultiChainApproximator.h.

◆ numberOfVariables()

template<class MarkovChainType >

std::size_t shark::MultiChainApproximator< MarkovChainType >::numberOfVariables ( ) const

inlinevirtual

Accesses the number of variables.

Implements shark::AbstractObjectiveFunction< PointType, ResultT >.

Definition at line 127 of file MultiChainApproximator.h.

◆ proposeStartingPoint()

template<class MarkovChainType >

SearchPointType shark::MultiChainApproximator< MarkovChainType >::proposeStartingPoint ( ) const

inlinevirtual

Proposes a starting point in the feasible search space of the function.

Returns: The generated starting point.

Exceptions

FeatureNotAvailableException in the default implementation and if a function does not support this feature.

Reimplemented from shark::AbstractObjectiveFunction< PointType, ResultT >.

Definition at line 123 of file MultiChainApproximator.h.

◆ setBatchSize()

template<class MarkovChainType >

void shark::MultiChainApproximator< MarkovChainType >::setBatchSize ( std::size_t batchSize )

inline

Definition at line 68 of file MultiChainApproximator.h.

References shark::batchSize().

Referenced by shark::MultiChainApproximator< MarkovChainType >::MultiChainApproximator().

◆ setData()

template<class MarkovChainType >

void shark::MultiChainApproximator< MarkovChainType >::setData ( UnlabeledData< RealVector > const & data )

inline

Definition at line 95 of file MultiChainApproximator.h.

References shark::Data< Type >::numberOfElements(), shark::MultiChainApproximator< MarkovChainType >::setNumberOfSamples(), and shark::swap().

◆ setK()

template<class MarkovChainType >

void shark::MultiChainApproximator< MarkovChainType >::setK ( unsigned int k )

inline

Definition at line 62 of file MultiChainApproximator.h.

◆ setNumberOfSamples()

template<class MarkovChainType >

void shark::MultiChainApproximator< MarkovChainType >::setNumberOfSamples ( std::size_t samples )

inline

Definition at line 65 of file MultiChainApproximator.h.

Referenced by shark::MultiChainApproximator< MarkovChainType >::setData().

◆ setRegularizer()

template<class MarkovChainType >

void shark::MultiChainApproximator< MarkovChainType >::setRegularizer	(	double	factor,
		SingleObjectiveFunction *	regularizer
	)

inline

Definition at line 131 of file MultiChainApproximator.h.

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

include/shark/Unsupervised/RBM/GradientApproximations/MultiChainApproximator.h

Public Types

Public Member Functions

Additional Inherited Members

Detailed Description

template<class MarkovChainType> class shark::MultiChainApproximator< MarkovChainType >

Member Typedef Documentation

◆ RBM

Constructor & Destructor Documentation

◆ MultiChainApproximator()

Member Function Documentation

◆ chain() [1/2]

◆ chain() [2/2]

◆ evalDerivative()

◆ name()

◆ numBatches() [1/2]

◆ numBatches() [2/2]

◆ numberOfVariables()

◆ proposeStartingPoint()

◆ setBatchSize()

◆ setData()

◆ setK()

◆ setNumberOfSamples()

◆ setRegularizer()

template<class MarkovChainType>
class shark::MultiChainApproximator< MarkovChainType >