gum::MarkovBlanket Class Reference

Class building the markov Blanket from a BN and a nodeName. More...

#include <agrum/BN/algorithms/MarokovBlanket.h>

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Public Member Functions
	MarkovBlanket (const DAGmodel &m, NodeId n, int level=1)
	MarkovBlanket (const DAGmodel &m, const std::string &name, int level=1)
	~MarkovBlanket ()
DAG	dag ()
std::string	toDot () const
const NodeSet &	parents (const NodeId id) const
	wrapping DAG::parents(id) More...
const NodeSet &	children (const NodeId id) const
	wrapping DAG::parents(id) More...
Size	sizeArcs () const
	wrapping DAG::sizeArcs() More...
const ArcSet &	arcs () const
	wrapping DAG::arcs() More...
Size	sizeNodes () const
	wrapping DAG::sizeNodes() More...
Size	size () const
	wrapping DAG::size() More...
const NodeGraphPart &	nodes () const
	wrapping DAG::nodes() More...
bool	hasSameStructure (const DAGmodel &other)

Detailed Description

Class building the markov Blanket from a BN and a nodeName.

The main goal of this class is to build and to encapsulate the DiGraph which represents the Markov Blanket.

Definition at line 49 of file MarkovBlanket.h.

Constructor & Destructor Documentation

MarkovBlanket() [1/2]

gum::MarkovBlanket::MarkovBlanket	(	const DAGmodel &	m,
		NodeId	n,
		int	level = 1
	)

Definition at line 37 of file MarkovBlanket.cpp.

References __buildMarkovBlanket(), __mb, __model, __node, __specialArcs, gum::DAG::addArc(), gum::NodeGraphPart::asNodeSet(), gum::DAGmodel::children(), gum::ArcGraphPart::existsArc(), gum::NodeGraphPart::existsNode(), GUM_ERROR, gum::Set< Key, Alloc >::insert(), and gum::NodeGraphPart::nodes().

                                                                      :
      __model(m), __node(id) {
    if (level < 1)
      GUM_ERROR(InvalidArgument, "Argument level(=" << level << ") must be >0.")

    NodeSet done;
    __buildMarkovBlanket(__node);
    done.insert(__node);

    while (level > 1) {
      level--;
      auto todo = __mb.nodes().asNodeSet() - done;
      bool anythingnew = false;
      for (NodeId n: todo) {
        done.insert(n);
        if (__buildMarkovBlanket(n)) anythingnew = true;
      }
      if (!anythingnew) break;
    }

    // we add now some arcs that are between the nodes in __mb but are not part of
    // the last ones.
    // For instance, an arc between a parent and a parent of children
    for (const auto node: __mb.nodes()) {
      for (const auto child: __model.children(node)) {
        if (__mb.existsNode(child) && !__mb.existsArc(Arc(node, child))) {
          __mb.addArc(node, child);
          __specialArcs.insert(Arc(node, child));
        }
      }
    }
  }

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MarkovBlanket() [2/2]

gum::MarkovBlanket::MarkovBlanket	(	const DAGmodel &	m,
		const std::string &	name,
		int	level = 1
	)

Definition at line 70 of file MarkovBlanket.cpp.

                                                         :
      MarkovBlanket(m, m.idFromName(name), level) {}

~MarkovBlanket()

gum::MarkovBlanket::~MarkovBlanket

(

)

Definition at line 75 of file MarkovBlanket.cpp.

{}

Member Function Documentation

__buildMarkovBlanket()

bool gum::MarkovBlanket::__buildMarkovBlanket ( const NodeId  id )

private

Definition at line 77 of file MarkovBlanket.cpp.

References __mb, __model, gum::DAG::addArc(), gum::NodeGraphPart::addNodeWithId(), gum::DAGmodel::children(), gum::NodeGraphPart::exists(), GUM_ERROR, gum::DAGmodel::nodes(), gum::NodeGraphPart::nodes(), and gum::DAGmodel::parents().

Referenced by MarkovBlanket().

                                                            {
    bool change = false;
    if (!__model.nodes().exists(node))
      GUM_ERROR(InvalidArgument, "Node " << node << " does not exist.");

    if (!__mb.nodes().exists(node)) {
      __mb.addNodeWithId(node);
      change = true;
    }

    for (const auto& parent: __model.parents(node)) {
      if (!__mb.nodes().exists(parent)) {
        __mb.addNodeWithId(parent);
        change = true;
      }
      __mb.addArc(parent, node);
    }

    for (const auto& child: __model.children(node)) {
      if (!__mb.nodes().exists(child)) {
        __mb.addNodeWithId(child);
        change = true;
      }
      __mb.addArc(node, child);
      for (const auto& opar: __model.parents(child)) {
        if (opar != node) {
          if (!__mb.nodes().exists(opar)) {
            __mb.addNodeWithId(opar);
            change = true;
          }
          __mb.addArc(opar, child);
        }
      }
    }

    return change;
  }

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arcs()

INLINE const ArcSet & gum::MarkovBlanket::arcs

(

)

const

wrapping DAG::arcs()

Definition at line 47 of file MarkovBlanket_inl.h.

References __mb, and gum::ArcGraphPart::arcs().

Referenced by hasSameStructure().

{ return __mb.arcs(); }

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children()

INLINE const NodeSet & gum::MarkovBlanket::children

(

const NodeId

id

)

const

wrapping DAG::parents(id)

Definition at line 41 of file MarkovBlanket_inl.h.

References __mb, and gum::ArcGraphPart::children().

                                                                     {
    return __mb.children(id);
  }

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dag()

INLINE DAG gum::MarkovBlanket::dag

(

)

Returns

a copy of the graph

Definition at line 35 of file MarkovBlanket_inl.h.

References __mb.

{ return __mb; }

hasSameStructure()

bool gum::MarkovBlanket::hasSameStructure

(

const DAGmodel &

other

)

Returns

true if all the named node are the same and all the named arcs are the same

Definition at line 115 of file MarkovBlanket.cpp.

References __model, arcs(), gum::DAGmodel::arcs(), gum::Set< Key, Alloc >::exists(), gum::DAGmodel::idFromName(), gum::Variable::name(), nodes(), size(), gum::DAGmodel::size(), sizeArcs(), gum::DAGmodel::sizeArcs(), and gum::DAGmodel::variable().

                                                            {
    if (size() != other.size()) return false;

    if (sizeArcs() != other.sizeArcs()) return false;

    for (const auto& nid: nodes()) {
      try {
        other.idFromName(__model.variable(nid).name());
      } catch (NotFound) { return false; }
    }

    for (const auto& arc: arcs()) {
      if (!other.arcs().exists(
             Arc(other.idFromName(__model.variable(arc.tail()).name()),
                 other.idFromName(__model.variable(arc.head()).name()))))
        return false;
    }

    return true;
  }

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nodes()

INLINE const NodeGraphPart & gum::MarkovBlanket::nodes

(

)

const

wrapping DAG::nodes()

Definition at line 53 of file MarkovBlanket_inl.h.

References __mb, and gum::NodeGraphPart::nodes().

Referenced by hasSameStructure().

{ return __mb.nodes(); }

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parents()

INLINE const NodeSet & gum::MarkovBlanket::parents

(

const NodeId

id

)

const

wrapping DAG::parents(id)

Definition at line 37 of file MarkovBlanket_inl.h.

References __mb, and gum::ArcGraphPart::parents().

                                                                    {
    return __mb.parents(id);
  }

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size()

INLINE Size gum::MarkovBlanket::size

(

)

const

wrapping DAG::size()

Definition at line 51 of file MarkovBlanket_inl.h.

References __mb, and gum::NodeGraphPart::size().

Referenced by hasSameStructure().

{ return __mb.size(); }

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sizeArcs()

INLINE Size gum::MarkovBlanket::sizeArcs

(

)

const

wrapping DAG::sizeArcs()

Definition at line 45 of file MarkovBlanket_inl.h.

References __mb, and gum::ArcGraphPart::sizeArcs().

Referenced by hasSameStructure().

{ return __mb.sizeArcs(); }

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sizeNodes()

INLINE Size gum::MarkovBlanket::sizeNodes

(

)

const

wrapping DAG::sizeNodes()

Definition at line 49 of file MarkovBlanket_inl.h.

References __mb, and gum::NodeGraphPart::sizeNodes().

{ return __mb.sizeNodes(); }

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toDot()

std::string gum::MarkovBlanket::toDot

(

)

const

Definition at line 136 of file MarkovBlanket.cpp.

References __mb, __model, __node, __specialArcs, gum::ArcGraphPart::children(), gum::Set< Key, Alloc >::exists(), gum::Variable::name(), gum::NodeGraphPart::nodes(), and gum::DAGmodel::variable().

                                       {
    std::stringstream output;
    std::stringstream nodeStream;
    std::stringstream arcStream;
    List< NodeId >    treatedNodes;
    output << "digraph \""
           << "no_name\" {" << std::endl;
    nodeStream << "node [shape = ellipse];" << std::endl;
    std::string tab = "  ";

    for (const auto node: __mb.nodes()) {
      nodeStream << tab << node << "[label=\"" << __model.variable(node).name()
                 << "\"";
      if (node == __node) { nodeStream << ", color=red"; }
      nodeStream << "];" << std::endl;

      for (const auto chi: __mb.children(node)) {
        arcStream << tab << node << " -> " << chi;
        if (__specialArcs.exists(Arc(node, chi))) { arcStream << " [color=grey]"; }
        arcStream << ";" << std::endl;
      }
    }

    output << nodeStream.str() << std::endl
           << arcStream.str() << std::endl
           << "}" << std::endl;

    return output.str();
  }

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Member Data Documentation

__mb

DAG gum::MarkovBlanket::__mb

private

Definition at line 94 of file MarkovBlanket.h.

Referenced by __buildMarkovBlanket(), arcs(), children(), dag(), MarkovBlanket(), nodes(), parents(), size(), sizeArcs(), sizeNodes(), and toDot().

__model

const DAGmodel& gum::MarkovBlanket::__model

private

Definition at line 93 of file MarkovBlanket.h.

Referenced by __buildMarkovBlanket(), hasSameStructure(), MarkovBlanket(), and toDot().

__node

const NodeId gum::MarkovBlanket::__node

private

Definition at line 95 of file MarkovBlanket.h.

Referenced by MarkovBlanket(), and toDot().

__specialArcs

ArcSet gum::MarkovBlanket::__specialArcs

private

Definition at line 96 of file MarkovBlanket.h.

Referenced by MarkovBlanket(), and toDot().

---

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

• agrum/BN/algorithms/MarkovBlanket.h
• agrum/BN/algorithms/MarkovBlanket.cpp
• agrum/BN/algorithms/MarkovBlanket_inl.h