gum::prm::PRMInference< GUM_SCALAR > Class Template Reference

This abstract class is used as base class for all inference class on PRM<GUM_SCALAR>. More...

#include <agrum/PRM/PRMInference.h>

Inheritance diagram for gum::prm::PRMInference< GUM_SCALAR >:

Collaboration diagram for gum::prm::PRMInference< GUM_SCALAR >:

Public Member Functions
Constructor & destructor.
	PRMInference (const PRM< GUM_SCALAR > &prm, const PRMSystem< GUM_SCALAR > &system)
	Default constructor. More...
	PRMInference (const PRMInference &source)
	Copy constructor. More...
virtual	~PRMInference ()
	Destructor. More...
PRMInference &	operator= (const PRMInference &source)
	Copy operator. More...
Getters & setters.
virtual std::string	name () const =0
	Returns the name of the current inference algorithm. More...
Query methods.
void	posterior (const Chain &chain, Potential< GUM_SCALAR > &m)
	Compute the posterior of the formal attribute pointed by chain and stores it in m. More...
void	joint (const std::vector< Chain > &chains, Potential< GUM_SCALAR > &j)
	Compute the joint probability of the formals attributes pointed by chains and stores it in m. More...
Evidence handling.
EMap &	evidence (const PRMInstance< GUM_SCALAR > &i)
	Returns EMap of evidences over i. More...
EMap &	evidence (const PRMInstance< GUM_SCALAR > *i)
	Returns EMap of evidences over i. More...
const EMap &	evidence (const PRMInstance< GUM_SCALAR > &i) const
	Returns EMap of evidences over i. More...
const EMap &	evidence (const PRMInstance< GUM_SCALAR > *i) const
	Returns EMap of evidences over i. More...
bool	hasEvidence (const PRMInstance< GUM_SCALAR > &i) const
	Returns true if i has evidence. More...
bool	hasEvidence (const PRMInstance< GUM_SCALAR > *i) const
	Returns EMap of evidences over i. More...
bool	hasEvidence (const Chain &chain) const
	Returns true if i has evidence on PRMAttribute<GUM_SCALAR> a. More...
bool	hasEvidence () const
	Returns true if i has evidence on PRMAttribute<GUM_SCALAR> a. More...
void	addEvidence (const Chain &chain, const Potential< GUM_SCALAR > &p)
	Add an evidence to the given instance's elt. More...
void	removeEvidence (const Chain &chain)
	Remove evidence on the given instance's elt. More...
void	clearEvidence ()
	Remove all evidences. More...

Public Types
typedef std::pair< const PRMInstance< GUM_SCALAR > *, const PRMAttribute< GUM_SCALAR > *>	Chain
	Code alias. More...
typedef NodeProperty< const Potential< GUM_SCALAR > *>	EMap
	Code alias. More...
typedef NodeProperty< const Potential< GUM_SCALAR > *>::iterator_safe	EMapIterator
	Code alias. More...
typedef NodeProperty< const Potential< GUM_SCALAR > *>::const_iterator_safe	EMapConstIterator
	Code alias. More...

Protected members.
PRM< GUM_SCALAR > const *	prm_
	The PRM<GUM_SCALAR> on which inference is done. More...
PRMSystem< GUM_SCALAR > const *	sys_
	The Model on which inference is done. More...
virtual void	evidenceAdded_ (const Chain &chain)=0
	This method is called whenever an evidence is added, but AFTER any processing made by PRMInference. More...
virtual void	evidenceRemoved_ (const Chain &chain)=0
	This method is called whenever an evidence is removed, but BEFORE any processing made by PRMInference. More...
virtual void	posterior_ (const Chain &chain, Potential< GUM_SCALAR > &m)=0
	Generic method to compute the posterior of given element. More...
virtual void	joint_ (const std::vector< Chain > &queries, Potential< GUM_SCALAR > &j)=0
	Generic method to compute the posterior of given element. More...

Private evidence handling methods and members.
typedef HashTable< const PRMInstance< GUM_SCALAR > *, EMap *>::iterator_safe	EvidenceIterator
	Code alias. More...
typedef HashTable< const PRMInstance< GUM_SCALAR > *, EMap *>::const_iterator_safe	EvidenceConstIterator
	Code alias. More...
HashTable< const PRMInstance< GUM_SCALAR > *, EMap *>	_evidences_
	Mapping of evidence over PRMInstance<GUM_SCALAR>'s nodes. More...
EMap &	_EMap_ (const PRMInstance< GUM_SCALAR > *i)
	Private getter over evidences, if necessary creates an EMap for i. More...

Detailed Description

template<typename GUM_SCALAR>
class gum::prm::PRMInference< GUM_SCALAR >

This abstract class is used as base class for all inference class on PRM<GUM_SCALAR>.

The main purpose of this class is to give a common interface between all inference algorithms and to handle evidences.

Definition at line 51 of file PRMInference.h.

Member Typedef Documentation

Chain

template<typename GUM_SCALAR>

typedef std::pair< const PRMInstance< GUM_SCALAR >*, const PRMAttribute< GUM_SCALAR >* > gum::prm::PRMInference< GUM_SCALAR >::Chain

Code alias.

Definition at line 55 of file PRMInference.h.

EMap

template<typename GUM_SCALAR>

typedef NodeProperty< const Potential< GUM_SCALAR >* > gum::prm::PRMInference< GUM_SCALAR >::EMap

Code alias.

Definition at line 58 of file PRMInference.h.

EMapConstIterator

template<typename GUM_SCALAR>

typedef NodeProperty< const Potential< GUM_SCALAR >* >::const_iterator_safe gum::prm::PRMInference< GUM_SCALAR >::EMapConstIterator

Code alias.

Definition at line 65 of file PRMInference.h.

EMapIterator

template<typename GUM_SCALAR>

typedef NodeProperty< const Potential< GUM_SCALAR >* >::iterator_safe gum::prm::PRMInference< GUM_SCALAR >::EMapIterator

Code alias.

Definition at line 61 of file PRMInference.h.

EvidenceConstIterator

template<typename GUM_SCALAR>

typedef HashTable< const PRMInstance< GUM_SCALAR >*, EMap* >::const_iterator_safe gum::prm::PRMInference< GUM_SCALAR >::EvidenceConstIterator

private

Code alias.

Definition at line 225 of file PRMInference.h.

EvidenceIterator

template<typename GUM_SCALAR>

typedef HashTable< const PRMInstance< GUM_SCALAR >*, EMap* >::iterator_safe gum::prm::PRMInference< GUM_SCALAR >::EvidenceIterator

private

Code alias.

Definition at line 222 of file PRMInference.h.

Constructor & Destructor Documentation

PRMInference() [1/2]

template<typename GUM_SCALAR>

INLINE gum::prm::PRMInference< GUM_SCALAR >::PRMInference	(	const PRM< GUM_SCALAR > &	prm,
		const PRMSystem< GUM_SCALAR > &	system
	)

Default constructor.

Definition at line 136 of file PRMInference_tpl.h.

                                                                                           :
        prm_(&prm),
        sys_(&system) {
      GUM_CONSTRUCTOR(PRMInference);
    }

PRMInference() [2/2]

template<typename GUM_SCALAR>

gum::prm::PRMInference< GUM_SCALAR >::PRMInference

(

const PRMInference< GUM_SCALAR > &

source

)

Copy constructor.

Definition at line 47 of file PRMInference_tpl.h.

                                                                                     :
        prm_(source.prm_), sys_(source.sys_) {
      GUM_CONS_CPY(PRMInference);

      for (const auto& elt: source._evidences_) {
        _evidences_.insert(elt.first, new PRMInference< GUM_SCALAR >::EMap());

        for (const auto& elt2: *elt.second) {
          Potential< GUM_SCALAR >* e = new Potential< GUM_SCALAR >();
          e->add(*(elt2.second->variablesSequence().front()));
          Instantiation i(*e);

          for (i.setFirst(); !i.end(); i.inc())
            e->set(i, elt2.second->get(i));

          _evidences_[elt.first]->insert(elt2.first, e);
        }
      }
    }

~PRMInference()

template<typename GUM_SCALAR >

INLINE gum::prm::PRMInference< GUM_SCALAR >::~PRMInference ( )

virtual

Destructor.

Definition at line 144 of file PRMInference_tpl.h.

                                                     {
      GUM_DESTRUCTOR(PRMInference);
      clearEvidence();
    }

Member Function Documentation

_EMap_()

template<typename GUM_SCALAR>

PRMInference< GUM_SCALAR >::EMap & gum::prm::PRMInference< GUM_SCALAR >::_EMap_ ( const PRMInstance< GUM_SCALAR > *  i )

private

Private getter over evidences, if necessary creates an EMap for i.

Definition at line 95 of file PRMInference_tpl.h.

                                                                            {
      if (_evidences_.exists(i)) {
        return *(_evidences_[i]);
      } else {
        _evidences_.insert(i, new PRMInference< GUM_SCALAR >::EMap());
        return *(_evidences_[i]);
      }
    }

addEvidence()

template<typename GUM_SCALAR>

void gum::prm::PRMInference< GUM_SCALAR >::addEvidence	(	const Chain &	chain,
		const Potential< GUM_SCALAR > &	p
	)

Add an evidence to the given instance's elt.

Parameters

chain	The variable being observed.
p	The Potential added (by copy) as evidence.

Exceptions

NotFound	Raised if elt does not belong to i.
OperationNotAllowed	Raised if p is inconsistent with elt.

Definition at line 105 of file PRMInference_tpl.h.

                                                                                   {
      if (chain.first->exists(chain.second->id())) {
        if ((p.nbrDim() != 1) || (!p.contains(chain.second->type().variable())))
          GUM_ERROR(OperationNotAllowed, "illegal evidence for the given PRMAttribute.")

        Potential< GUM_SCALAR >* e = new Potential< GUM_SCALAR >();
        e->add(chain.second->type().variable());
        Instantiation i(*e);

        for (i.setFirst(); !i.end(); i.inc())
          e->set(i, p.get(i));

        PRMInference< GUM_SCALAR >::EMap& emap = _EMap_(chain.first);

        if (emap.exists(chain.second->id())) {
          delete emap[chain.second->id()];
          emap[chain.second->id()] = e;
        } else {
          emap.insert(chain.second->id(), e);
        }

        evidenceAdded_(chain);
      } else {
        GUM_ERROR(NotFound,
                  "the given PRMAttribute does not belong to this "
                  "Instance<GUM_SCALAR>.");
      }
    }

clearEvidence()

template<typename GUM_SCALAR >

void gum::prm::PRMInference< GUM_SCALAR >::clearEvidence

(

)

Remove all evidences.

Definition at line 35 of file PRMInference_tpl.h.

                                                   {
      for (const auto& elt: _evidences_) {
        for (const auto& elt2: *elt.second)
          delete elt2.second;

        delete elt.second;
      }

      _evidences_.clear();
    }

evidence() [1/4]

template<typename GUM_SCALAR>

INLINE PRMInference< GUM_SCALAR >::EMap & gum::prm::PRMInference< GUM_SCALAR >::evidence

(

const PRMInstance< GUM_SCALAR > &

i

)

Returns EMap of evidences over i.

Exceptions

NotFound

if i has no evidence.

Definition at line 151 of file PRMInference_tpl.h.

                                                                              {
      try {
        return *(_evidences_[&i]);
      } catch (NotFound&) { GUM_ERROR(NotFound, "this instance has no evidence.") }
    }

evidence() [2/4]

template<typename GUM_SCALAR>

INLINE PRMInference< GUM_SCALAR >::EMap & gum::prm::PRMInference< GUM_SCALAR >::evidence

(

const PRMInstance< GUM_SCALAR > *

i

)

Returns EMap of evidences over i.

Exceptions

NotFound

if i has no evidence.

Definition at line 167 of file PRMInference_tpl.h.

                                                                              {
      try {
        return *(_evidences_[i]);
      } catch (NotFound&) { GUM_ERROR(NotFound, "this instance has no evidence.") }
    }

evidence() [3/4]

template<typename GUM_SCALAR>

INLINE const PRMInference< GUM_SCALAR >::EMap & gum::prm::PRMInference< GUM_SCALAR >::evidence

(

const PRMInstance< GUM_SCALAR > &

i

)

const

Returns EMap of evidences over i.

Exceptions

NotFound

if i has no evidence.

Definition at line 159 of file PRMInference_tpl.h.

                                                                                    {
      try {
        return *(_evidences_[&i]);
      } catch (NotFound&) { GUM_ERROR(NotFound, "this instance has no evidence.") }
    }

evidence() [4/4]

template<typename GUM_SCALAR>

INLINE const PRMInference< GUM_SCALAR >::EMap & gum::prm::PRMInference< GUM_SCALAR >::evidence

(

const PRMInstance< GUM_SCALAR > *

i

)

const

Returns EMap of evidences over i.

Exceptions

NotFound

if i has no evidence.

Definition at line 175 of file PRMInference_tpl.h.

                                                                                    {
      try {
        return *(_evidences_[i]);
      } catch (NotFound&) { GUM_ERROR(NotFound, "this instance has no evidence.") }
    }

evidenceAdded_()

template<typename GUM_SCALAR>

virtual void gum::prm::PRMInference< GUM_SCALAR >::evidenceAdded_ ( const Chain &  chain )

protectedpure virtual

This method is called whenever an evidence is added, but AFTER any processing made by PRMInference.

Implemented in gum::prm::SVE< GUM_SCALAR >, and gum::prm::SVED< GUM_SCALAR >.

evidenceRemoved_()

template<typename GUM_SCALAR>

virtual void gum::prm::PRMInference< GUM_SCALAR >::evidenceRemoved_ ( const Chain &  chain )

protectedpure virtual

This method is called whenever an evidence is removed, but BEFORE any processing made by PRMInference.

Implemented in gum::prm::SVE< GUM_SCALAR >, and gum::prm::SVED< GUM_SCALAR >.

hasEvidence() [1/4]

template<typename GUM_SCALAR>

INLINE bool gum::prm::PRMInference< GUM_SCALAR >::hasEvidence

(

const PRMInstance< GUM_SCALAR > &

i

)

const

Returns true if i has evidence.

Definition at line 182 of file PRMInference_tpl.h.

                                                                                                {
      return _evidences_.exists(&i);
    }

hasEvidence() [2/4]

template<typename GUM_SCALAR>

INLINE bool gum::prm::PRMInference< GUM_SCALAR >::hasEvidence

(

const PRMInstance< GUM_SCALAR > *

i

)

const

Returns EMap of evidences over i.

Definition at line 187 of file PRMInference_tpl.h.

                                                                                                {
      return _evidences_.exists(i);
    }

hasEvidence() [3/4]

template<typename GUM_SCALAR>

INLINE bool gum::prm::PRMInference< GUM_SCALAR >::hasEvidence

(

const Chain &

chain

)

const

Returns true if i has evidence on PRMAttribute<GUM_SCALAR> a.

Definition at line 192 of file PRMInference_tpl.h.

                                                                                {
      return (hasEvidence(chain.first)) ? evidence(chain.first).exists(chain.second->id()) : false;
    }

hasEvidence() [4/4]

template<typename GUM_SCALAR>

INLINE bool gum::prm::PRMInference< GUM_SCALAR >::hasEvidence

(

)

const

Returns true if i has evidence on PRMAttribute<GUM_SCALAR> a.

Definition at line 197 of file PRMInference_tpl.h.

                                                              {
      return (_evidences_.size() != (Size)0);
    }

joint()

template<typename GUM_SCALAR>

INLINE void gum::prm::PRMInference< GUM_SCALAR >::joint	(	const std::vector< Chain > &	chains,
		Potential< GUM_SCALAR > &	j
	)

Compute the joint probability of the formals attributes pointed by chains and stores it in m.

Parameters

chains	A Set of strings of the form instance.attribute.
j	An empty CPF which will be filed by the joint probability over chains.

Exceptions

NotFound	Raised if some chain in chains does not point to a formal attribute.
OperationNotAllowed	Raise if m is not empty.

Definition at line 241 of file PRMInference_tpl.h.

                                                                           {
      if (j.nbrDim() > 0) { GUM_ERROR(OperationNotAllowed, "the given Potential is not empty.") }

      for (auto chain = chains.begin(); chain != chains.end(); ++chain) {
        j.add(chain->second->type().variable());
      }

      joint_(chains, j);
    }

joint_()

template<typename GUM_SCALAR>

virtual void gum::prm::PRMInference< GUM_SCALAR >::joint_ ( const std::vector< Chain > &  queries, Potential< GUM_SCALAR > &  j  )

protectedpure virtual

Generic method to compute the posterior of given element.

Parameters

queries	Set of pairs of PRMInstance<GUM_SCALAR> and PRMAttribute<GUM_SCALAR>.
j	CPF filled with the joint probability of queries. It is initialized properly.

Implemented in gum::prm::SVE< GUM_SCALAR >, and gum::prm::SVED< GUM_SCALAR >.

name()

template<typename GUM_SCALAR>

virtual std::string gum::prm::PRMInference< GUM_SCALAR >::name ( ) const

pure virtual

Returns the name of the current inference algorithm.

Implemented in gum::prm::StructuredInference< GUM_SCALAR >, gum::prm::GroundedInference< GUM_SCALAR >, gum::prm::SVE< GUM_SCALAR >, and gum::prm::SVED< GUM_SCALAR >.

operator=()

template<typename GUM_SCALAR >

PRMInference< GUM_SCALAR > & gum::prm::PRMInference< GUM_SCALAR >::operator=

(

const PRMInference< GUM_SCALAR > &

source

)

Copy operator.

Definition at line 69 of file PRMInference_tpl.h.

                                                                                     {
      clearEvidence();
      prm_ = source.prm_;
      sys_ = source.sys_;

      for (const auto& elt: source._evidences_) {
        _evidences_.insert(elt.first, new PRMInference< GUM_SCALAR >::EMap());

        for (const auto& elt2: *elt.second) {
          Potential< GUM_SCALAR >* e = new Potential< GUM_SCALAR >();
          e->add(*(elt2.second->variablesSequence().front()));
          Instantiation i(*e);

          for (i.setFirst(); !i.end(); i.inc()) {
            e->set(i, elt2.second->get(i));
          }

          _evidences_[elt.first]->insert(elt2.first, e);
        }
      }

      return *this;
    }

posterior()

template<typename GUM_SCALAR>

INLINE void gum::prm::PRMInference< GUM_SCALAR >::posterior	(	const Chain &	chain,
		Potential< GUM_SCALAR > &	m
	)

Compute the posterior of the formal attribute pointed by chain and stores it in m.

Parameters

chain	A string of the form instance.attribute.
m	An empty CPF which will be filed by the posterior of chain.

Exceptions

NotFound	Raised if chain is invalid.
TypeError	Raised if chain does not point to an PRMAttribute<GUM_SCALAR>.
OperationNotAllowed	Raise if m is not empty.

Definition at line 215 of file PRMInference_tpl.h.

                                                            {
      if (m.nbrDim() > 0) { GUM_ERROR(OperationNotAllowed, "the given Potential is not empty.") }

      if (hasEvidence(chain)) {
        m.add(chain.second->type().variable());
        const Potential< GUM_SCALAR >& e = *(evidence(chain.first)[chain.second->id()]);
        Instantiation                  i(m), j(e);

        for (i.setFirst(), j.setFirst(); !i.end(); i.inc(), j.inc())
          m.set(i, e.get(j));
      } else {
        if (chain.second != &(chain.first->get(chain.second->safeName()))) {
          typename PRMInference< GUM_SCALAR >::Chain good_chain
             = std::make_pair(chain.first, &(chain.first->get(chain.second->safeName())));
          m.add(good_chain.second->type().variable());
          posterior_(good_chain, m);
        } else {
          m.add(chain.second->type().variable());
          posterior_(chain, m);
        }
      }
    }

posterior_()

template<typename GUM_SCALAR>

virtual void gum::prm::PRMInference< GUM_SCALAR >::posterior_ ( const Chain &  chain, Potential< GUM_SCALAR > &  m  )

protectedpure virtual

Generic method to compute the posterior of given element.

Parameters

chain
m	CPF filled with the posterior of elt. It is initialized properly.

Implemented in gum::prm::SVE< GUM_SCALAR >, and gum::prm::SVED< GUM_SCALAR >.

removeEvidence()

template<typename GUM_SCALAR >

INLINE void gum::prm::PRMInference< GUM_SCALAR >::removeEvidence

(

const Chain &

chain

)

Remove evidence on the given instance's elt.

Parameters

chain

The variable being observed.

Exceptions

NotFound	Raised if the given names are not found.
TypeError	Raised if the elt is not an PRMAttribute<GUM_SCALAR>.

Definition at line 202 of file PRMInference_tpl.h.

                                                                             {
      try {
        if (_EMap_(chain.first).exists(chain.second->id())) {
          evidenceRemoved_(chain);
          delete _EMap_(chain.first)[chain.second->id()];
          _EMap_(chain.first).erase(chain.second->id());
        }
      } catch (NotFound&) {
        // Ok, we are only removing
      }
    }

Member Data Documentation

_evidences_

template<typename GUM_SCALAR>

HashTable< const PRMInstance< GUM_SCALAR >*, EMap* > gum::prm::PRMInference< GUM_SCALAR >::_evidences_

private

Mapping of evidence over PRMInstance<GUM_SCALAR>'s nodes.

Definition at line 228 of file PRMInference.h.

prm_

template<typename GUM_SCALAR>

PRM< GUM_SCALAR > const* gum::prm::PRMInference< GUM_SCALAR >::prm_

protected

The PRM<GUM_SCALAR> on which inference is done.

Definition at line 207 of file PRMInference.h.

sys_

template<typename GUM_SCALAR>

PRMSystem< GUM_SCALAR > const* gum::prm::PRMInference< GUM_SCALAR >::sys_

protected

The Model on which inference is done.

Definition at line 210 of file PRMInference.h.

---

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

• agrum/PRM/inference/PRMInference.h
• agrum/PRM/inference/PRMInference_tpl.h