gum::learning::StructuralConstraintMandatoryArcs Class Reference

the structural constraint indicating that some arcs shall never be removed or reversed More...

#include <structuralConstraintMandatoryArcs.h>

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Public Types
using	allConstraints = _ConstraintSet_< void >

Public Member Functions
Constructors / Destructors
	StructuralConstraintMandatoryArcs ()
	default constructor
	StructuralConstraintMandatoryArcs (const DiGraph &graph)
	constructor starting with a given graph
	StructuralConstraintMandatoryArcs (const StructuralConstraintMandatoryArcs &from)
	copy constructor
	StructuralConstraintMandatoryArcs (StructuralConstraintMandatoryArcs &&from)
	move constructor
virtual	~StructuralConstraintMandatoryArcs ()
	destructor
Operators
StructuralConstraintMandatoryArcs &	operator= (const StructuralConstraintMandatoryArcs &from)
	copy operator
StructuralConstraintMandatoryArcs &	operator= (StructuralConstraintMandatoryArcs &&from)
	move operator
Specific Accessors / Modifiers
void	setArcs (const ArcSet &set)
	assign a set of forbidden arcs
void	addArc (const Arc &arc)
	assign a new forbidden arc
void	eraseArc (const Arc &arc)
	remove a forbidden arc
const ArcSet &	arcs () const
	returns the set of mandatory arcs
void	setGraphAlone (const DiGraph &graph)
	sets a new graph from which we will perform checkings
void	modifyGraphAlone (const ArcAddition &change)
	notify the constraint of a modification of the graph
void	modifyGraphAlone (const ArcDeletion &change)
	notify the constraint of a modification of the graph
void	modifyGraphAlone (const ArcReversal &change)
	notify the constraint of a modification of the graph
void	modifyGraphAlone (const ArcTriangleDeletion1 &change)
	notify the constraint of a modification of the graph
void	modifyGraphAlone (const ArcTriangleDeletion2 &change)
	notify the constraint of a modification of the graph
void	modifyGraphAlone (const GraphChange &change)
	notify the constraint of a modification of the graph
bool	isAlwaysInvalidAlone (const GraphChange &change) const
	indicates whether a change will always violate the constraint
bool	checkArcAdditionAlone (NodeId x, NodeId y) const
	checks whether the constraints enable to add arc (x,y)
bool	checkArcDeletionAlone (NodeId x, NodeId y) const
	checks whether the constraints enable to remove arc (x,y)
bool	checkArcReversalAlone (NodeId x, NodeId y) const
	checks whether the constraints enable to reverse arc (x,y)
bool	checkArcTriangleDeletion1Alone (NodeId node1, NodeId node2, NodeId node3) const
	checks whether the constraints enable to apply an ArcTriangleDeletion1
bool	checkArcTriangleDeletion2Alone (NodeId node1, NodeId node2, NodeId node3) const
	checks whether the constraints enable to apply an ArcTriangleDeletion2
bool	checkModificationAlone (const GraphChange &change) const
	checks whether the constraints enable to perform a graph change
bool	checkModificationAlone (const ArcAddition &change) const
	checks whether the constraints enable to add an arc
bool	checkModificationAlone (const ArcDeletion &change) const
	checks whether the constraints enable to remove an arc
bool	checkModificationAlone (const ArcReversal &change) const
	checks whether the constraints enable to reverse an arc
bool	checkModificationAlone (const ArcTriangleDeletion1 &change) const
	checks whether the constraints enable to apply an ArcTriangleDeletion1
bool	checkModificationAlone (const ArcTriangleDeletion2 &change) const
	checks whether the constraints enable to apply an ArcTriangleDeletion2

Protected Attributes
ArcSet	_MandatoryArcs_mandatory_arcs_
	the MandatoryArcs on which we perform checks

Detailed Description

the structural constraint indicating that some arcs shall never be removed or reversed

Definition at line 64 of file structuralConstraintMandatoryArcs.h.

Member Typedef Documentation

allConstraints

using gum::learning::StructuralConstraintEmpty::allConstraints = _ConstraintSet_< void >

inherited

Definition at line 61 of file structuralConstraint.h.

Constructor & Destructor Documentation

StructuralConstraintMandatoryArcs() [1/4]

gum::learning::StructuralConstraintMandatoryArcs::StructuralConstraintMandatoryArcs

(

)

default constructor

Definition at line 61 of file structuralConstraintMandatoryArcs.cpp.

                                                                         {
      GUM_CONSTRUCTOR(StructuralConstraintMandatoryArcs);
    }

References StructuralConstraintMandatoryArcs().

Referenced by StructuralConstraintMandatoryArcs(), StructuralConstraintMandatoryArcs(), StructuralConstraintMandatoryArcs(), StructuralConstraintMandatoryArcs(), ~StructuralConstraintMandatoryArcs(), operator=(), and operator=().

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StructuralConstraintMandatoryArcs() [2/4]

gum::learning::StructuralConstraintMandatoryArcs::StructuralConstraintMandatoryArcs

(

const DiGraph &

graph

)

constructor starting with a given graph

Definition at line 66 of file structuralConstraintMandatoryArcs.cpp.

                                                                                             {
      setGraph(graph);
      GUM_CONSTRUCTOR(StructuralConstraintMandatoryArcs);
    }

References StructuralConstraintMandatoryArcs().

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StructuralConstraintMandatoryArcs() [3/4]

gum::learning::StructuralConstraintMandatoryArcs::StructuralConstraintMandatoryArcs

(

const StructuralConstraintMandatoryArcs &

from

)

copy constructor

Definition at line 72 of file structuralConstraintMandatoryArcs.cpp.

                                                       :
        _MandatoryArcs_mandatory_arcs_(from._MandatoryArcs_mandatory_arcs_) {
      GUM_CONS_CPY(StructuralConstraintMandatoryArcs);
    }

References StructuralConstraintMandatoryArcs(), and _MandatoryArcs_mandatory_arcs_.

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StructuralConstraintMandatoryArcs() [4/4]

gum::learning::StructuralConstraintMandatoryArcs::StructuralConstraintMandatoryArcs

(

StructuralConstraintMandatoryArcs &&

from

)

move constructor

Definition at line 79 of file structuralConstraintMandatoryArcs.cpp.

                                                  :
        _MandatoryArcs_mandatory_arcs_(std::move(from._MandatoryArcs_mandatory_arcs_)) {
      GUM_CONS_MOV(StructuralConstraintMandatoryArcs);
    }

References StructuralConstraintMandatoryArcs(), and _MandatoryArcs_mandatory_arcs_.

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~StructuralConstraintMandatoryArcs()

gum::learning::StructuralConstraintMandatoryArcs::~StructuralConstraintMandatoryArcs ( )

virtual

destructor

Definition at line 86 of file structuralConstraintMandatoryArcs.cpp.

                                                                          {
      GUM_DESTRUCTOR(StructuralConstraintMandatoryArcs);
    }

References StructuralConstraintMandatoryArcs().

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Member Function Documentation

addArc()

void gum::learning::StructuralConstraintMandatoryArcs::addArc

(

const Arc &

arc

)

assign a new forbidden arc

arcs()

const ArcSet & gum::learning::StructuralConstraintMandatoryArcs::arcs

(

)

const

returns the set of mandatory arcs

checkArcAdditionAlone()

bool gum::learning::StructuralConstraintMandatoryArcs::checkArcAdditionAlone	(	NodeId	x,
		NodeId	y ) const

checks whether the constraints enable to add arc (x,y)

an arc can be added if and only if its extremal nodes belong to the graph and the arc does not already exist.

Referenced by checkModificationAlone().

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checkArcDeletionAlone()

bool gum::learning::StructuralConstraintMandatoryArcs::checkArcDeletionAlone	(	NodeId	x,
		NodeId	y ) const

checks whether the constraints enable to remove arc (x,y)

an arc can be removed if and only if the arc exists.

Referenced by checkModificationAlone(), and isAlwaysInvalidAlone().

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checkArcReversalAlone()

bool gum::learning::StructuralConstraintMandatoryArcs::checkArcReversalAlone	(	NodeId	x,
		NodeId	y ) const

checks whether the constraints enable to reverse arc (x,y)

an arc can be reversed if and only if it exists and arc (y,x) does not.

Referenced by checkModificationAlone(), and isAlwaysInvalidAlone().

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checkArcTriangleDeletion1Alone()

bool gum::learning::StructuralConstraintMandatoryArcs::checkArcTriangleDeletion1Alone	(	NodeId	node1,
		NodeId	node2,
		NodeId	node3 ) const

checks whether the constraints enable to apply an ArcTriangleDeletion1

An arc triangle deletion1 substitutes triangle node1 -> node2 -> node3 + node1 -> node3 into v-structure node2 -> node1 <- node3

Referenced by checkModificationAlone(), and isAlwaysInvalidAlone().

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checkArcTriangleDeletion2Alone()

bool gum::learning::StructuralConstraintMandatoryArcs::checkArcTriangleDeletion2Alone	(	NodeId	node1,
		NodeId	node2,
		NodeId	node3 ) const

checks whether the constraints enable to apply an ArcTriangleDeletion2

An arc triangle deletion1 substitutes triangle node1 -> node2 -> node3 + node1 -> node3 into v-structure node1 -> node2 <- node3

Referenced by checkModificationAlone(), and isAlwaysInvalidAlone().

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checkModificationAlone() [1/6]

bool gum::learning::StructuralConstraintMandatoryArcs::checkModificationAlone

(

const ArcAddition &

change

)

const

checks whether the constraints enable to add an arc

an arc can be added if and only if its extremal nodes belong to the graph and the arc does not already exist.

checkModificationAlone() [2/6]

bool gum::learning::StructuralConstraintMandatoryArcs::checkModificationAlone

(

const ArcDeletion &

change

)

const

checks whether the constraints enable to remove an arc

an arc can be removed if and only if the arc exists.

checkModificationAlone() [3/6]

bool gum::learning::StructuralConstraintMandatoryArcs::checkModificationAlone

(

const ArcReversal &

change

)

const

checks whether the constraints enable to reverse an arc

an arc (x,y) can be reversed if and only if it exists and arc (y,x) does not.

checkModificationAlone() [4/6]

bool gum::learning::StructuralConstraintMandatoryArcs::checkModificationAlone

(

const ArcTriangleDeletion1 &

change

)

const

checks whether the constraints enable to apply an ArcTriangleDeletion1

An arc triangle deletion1 substitutes triangle node1 -> node2 -> node3 + node1 -> node3 into v-structure node2 -> node1 <- node3

checkModificationAlone() [5/6]

bool gum::learning::StructuralConstraintMandatoryArcs::checkModificationAlone

(

const ArcTriangleDeletion2 &

change

)

const

checks whether the constraints enable to apply an ArcTriangleDeletion2

An arc triangle deletion1 substitutes triangle node1 -> node2 -> node3 + node1 -> node3 into v-structure node1 -> node2 <- node3

checkModificationAlone() [6/6]

bool gum::learning::StructuralConstraintMandatoryArcs::checkModificationAlone

(

const GraphChange &

change

)

const

checks whether the constraints enable to perform a graph change

An arc can be added if and only if its extremal nodes belong to the graph and the arc does not already exist. An arc can be removed if and only if the arc exists. An arc (x,y) can be reversed if and only if it exists and arc (y,x) does not.

Definition at line 107 of file structuralConstraintMandatoryArcs.cpp.

                                                                                                 {
      switch (change.type()) {
        case GraphChangeType::ARC_ADDITION :
          return checkArcAdditionAlone(change.node1(), change.node2());
 
        case GraphChangeType::ARC_DELETION :
          return checkArcDeletionAlone(change.node1(), change.node2());
 
        case GraphChangeType::ARC_REVERSAL :
          return checkArcReversalAlone(change.node1(), change.node2());
 
        case GraphChangeType::ARC_TRIANGLE_DELETION1 :
          return checkArcTriangleDeletion1Alone(change.node1(), change.node2(), change.node3());
 
        case GraphChangeType::ARC_TRIANGLE_DELETION2 :
          return checkArcTriangleDeletion2Alone(change.node1(), change.node2(), change.node3());
 
        default :
          GUM_ERROR(OperationNotAllowed,
                    "Graph change operation "
                        << change.typeAsString()
                        << " is not supported by the Mandatory Arcs structural constraint");
      }
    }

References gum::learning::ARC_ADDITION, gum::learning::ARC_DELETION, gum::learning::ARC_REVERSAL, gum::learning::ARC_TRIANGLE_DELETION1, gum::learning::ARC_TRIANGLE_DELETION2, checkArcAdditionAlone(), checkArcDeletionAlone(), checkArcReversalAlone(), checkArcTriangleDeletion1Alone(), checkArcTriangleDeletion2Alone(), GUM_ERROR, gum::learning::GraphChange::node1(), gum::learning::GraphChange::node2(), gum::learning::GraphChange::node3(), gum::learning::GraphChange::type(), and gum::learning::GraphChange::typeAsString().

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eraseArc()

void gum::learning::StructuralConstraintMandatoryArcs::eraseArc

(

const Arc &

arc

)

remove a forbidden arc

isAlwaysInvalidAlone()

bool gum::learning::StructuralConstraintMandatoryArcs::isAlwaysInvalidAlone

(

const GraphChange &

change

)

const

indicates whether a change will always violate the constraint

Some learning algorithms need examine several times whether a given graph change can be applied. For instance, the first time arc (X,Y) addition is considered, the learning algorithm may discard this change because it violates the structural constraint (e.g., if the latter enforces a DAG structure, this arc addition might induce a directed cycle), but, later on, other arc removal may induce that the arc addition is now possible. Such change is thus not always invalid. Conversely, there are changes that can be discarded once and for all. For instance, in a 2TBN structure, it is always impossible to add a backward-time arc. Such graph changes are always invalid and are therefore tagged as such by the isAlwaysInvalid method.

Definition at line 132 of file structuralConstraintMandatoryArcs.cpp.

                                                                                                {
      switch (change.type()) {
        case GraphChangeType::ARC_ADDITION : return false;
 
        case GraphChangeType::ARC_DELETION :
          return !checkArcDeletionAlone(change.node1(), change.node2());
 
        case GraphChangeType::ARC_REVERSAL :
          return !checkArcReversalAlone(change.node1(), change.node2());
 
        case GraphChangeType::ARC_TRIANGLE_DELETION1 :
          return !checkArcTriangleDeletion1Alone(change.node1(), change.node2(), change.node3());
 
        case GraphChangeType::ARC_TRIANGLE_DELETION2 :
          return !checkArcTriangleDeletion2Alone(change.node1(), change.node2(), change.node3());
 
        default :
          GUM_ERROR(OperationNotAllowed,
                    "Graph change operation "
                        << change.typeAsString()
                        << " is not supported by the Mandatory Arcs structural constraint");
      }
    }

References gum::learning::ARC_ADDITION, gum::learning::ARC_DELETION, gum::learning::ARC_REVERSAL, gum::learning::ARC_TRIANGLE_DELETION1, gum::learning::ARC_TRIANGLE_DELETION2, checkArcDeletionAlone(), checkArcReversalAlone(), checkArcTriangleDeletion1Alone(), checkArcTriangleDeletion2Alone(), GUM_ERROR, gum::learning::GraphChange::node1(), gum::learning::GraphChange::node2(), gum::learning::GraphChange::node3(), gum::learning::GraphChange::type(), and gum::learning::GraphChange::typeAsString().

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modifyGraphAlone() [1/6]

void gum::learning::StructuralConstraintMandatoryArcs::modifyGraphAlone

(

const ArcAddition &

change

)

notify the constraint of a modification of the graph

Warning

If an already existing arc is added nothing is done. In particular, no exception is raised.

Exceptions

InvalidNode

exception is thrown if an arc (x,y) is added and x or y does not belong to the graph nodes

modifyGraphAlone() [2/6]

void gum::learning::StructuralConstraintMandatoryArcs::modifyGraphAlone

(

const ArcDeletion &

change

)

notify the constraint of a modification of the graph

Warning

If a nonexisting arc is removed, nothing is done. In particular, no exception is raised.

modifyGraphAlone() [3/6]

void gum::learning::StructuralConstraintMandatoryArcs::modifyGraphAlone

(

const ArcReversal &

change

)

notify the constraint of a modification of the graph

Warning

If an already existing arc is added, or if a nonexisting arc is removed, nothing is done. In particular, no exception is raised.

Exceptions

InvalidNode

exception is thrown if at least one extremity of the arc does not belong to the graph nodes

modifyGraphAlone() [4/6]

void gum::learning::StructuralConstraintMandatoryArcs::modifyGraphAlone

(

const ArcTriangleDeletion1 &

change

)

notify the constraint of a modification of the graph

An arc triangle deletion1 substitutes triangle node1 -> node2 -> node3 + node1 -> node3 into v-structure node2 -> node1 <- node3

modifyGraphAlone() [5/6]

void gum::learning::StructuralConstraintMandatoryArcs::modifyGraphAlone

(

const ArcTriangleDeletion2 &

change

)

notify the constraint of a modification of the graph

An arc triangle deletion1 substitutes triangle node1 -> node2 -> node3 + node1 -> node3 into v-structure node1 -> node2 <- node3

modifyGraphAlone() [6/6]

void gum::learning::StructuralConstraintMandatoryArcs::modifyGraphAlone

(

const GraphChange &

change

)

notify the constraint of a modification of the graph

Warning

If an already existing arc is added, or if a nonexisting arc is removed, nothing is done. In particular, no exception is raised.

Exceptions

InvalidNode

exception is thrown if an arc (x,y) is added and x or y does not belong to the graph nodes

operator=() [1/2]

StructuralConstraintMandatoryArcs & gum::learning::StructuralConstraintMandatoryArcs::operator=

(

const StructuralConstraintMandatoryArcs &

from

)

copy operator

Definition at line 91 of file structuralConstraintMandatoryArcs.cpp.

                                                       {
      if (this != &from) { _MandatoryArcs_mandatory_arcs_ = from._MandatoryArcs_mandatory_arcs_; }
      return *this;
    }

References StructuralConstraintMandatoryArcs(), and _MandatoryArcs_mandatory_arcs_.

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operator=() [2/2]

StructuralConstraintMandatoryArcs & gum::learning::StructuralConstraintMandatoryArcs::operator=

(

StructuralConstraintMandatoryArcs &&

from

)

move operator

Definition at line 99 of file structuralConstraintMandatoryArcs.cpp.

                                                                                           {
      if (this != &from) {
        _MandatoryArcs_mandatory_arcs_ = std::move(from._MandatoryArcs_mandatory_arcs_);
      }
      return *this;
    }

References StructuralConstraintMandatoryArcs(), and _MandatoryArcs_mandatory_arcs_.

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setArcs()

void gum::learning::StructuralConstraintMandatoryArcs::setArcs

(

const ArcSet &

set

)

assign a set of forbidden arcs

setGraphAlone()

void gum::learning::StructuralConstraintMandatoryArcs::setGraphAlone

(

const DiGraph &

graph

)

sets a new graph from which we will perform checkings

Member Data Documentation

_MandatoryArcs_mandatory_arcs_

ArcSet gum::learning::StructuralConstraintMandatoryArcs::_MandatoryArcs_mandatory_arcs_

protected

the MandatoryArcs on which we perform checks

Definition at line 248 of file structuralConstraintMandatoryArcs.h.

Referenced by StructuralConstraintMandatoryArcs(), StructuralConstraintMandatoryArcs(), operator=(), and operator=().

---

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

• agrum/BN/learning/constraints/structuralConstraintMandatoryArcs.h
• agrum/BN/learning/constraints/structuralConstraintMandatoryArcs.cpp