structuralConstraintDAG.h

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#ifndef GUM_LEARNING_STRUCTURAL_CONSTRAINT_DAG_H
#define GUM_LEARNING_STRUCTURAL_CONSTRAINT_DAG_H
 
#include <atomic>
 
#include <agrum/agrum.h>
 
#include <agrum/base/graphs/DAG.h>
#include <agrum/BN/learning/constraints/structuralConstraint.h>
 
namespace gum {
 
  namespace learning {

    class StructuralConstraintDAG: public virtual StructuralConstraintEmpty {
      public:
      // ##########################################################################
      // ##########################################################################

      StructuralConstraintDAG();

      StructuralConstraintDAG(Size nb_nodes);

      StructuralConstraintDAG(const DAG& graph);

      StructuralConstraintDAG(const StructuralConstraintDAG& from);

      StructuralConstraintDAG(StructuralConstraintDAG&& from) noexcept;

      virtual ~StructuralConstraintDAG();

 
      // ##########################################################################
      // ##########################################################################

      StructuralConstraintDAG& operator=(const StructuralConstraintDAG& from);

      StructuralConstraintDAG& operator=(StructuralConstraintDAG&& from);

 
      // ##########################################################################
      // ##########################################################################

      void setGraphAlone(const DiGraph& graph);

      void setGraphAlone(Size nb_nodes);


      void modifyGraphAlone(const ArcAddition& change);


      void modifyGraphAlone(const ArcDeletion& change);


      void modifyGraphAlone(const ArcReversal& change);


      void modifyGraphAlone(const ArcTriangleDeletion1& change);


      void modifyGraphAlone(const ArcTriangleDeletion2& change);


      void modifyGraphAlone(const GraphChange& change);


      bool isAlwaysInvalidAlone(const GraphChange& change) const;


      bool checkArcAdditionAlone(NodeId x, NodeId y) const;

      bool checkArcDeletionAlone(NodeId x, NodeId y) const;


      bool checkArcReversalAlone(NodeId x, NodeId y) const;


      bool checkArcTriangleDeletion1Alone(NodeId node1, NodeId node2, NodeId node3) const;


      bool checkArcTriangleDeletion2Alone(NodeId node1, NodeId node2, NodeId node3) const;


      bool checkModificationAlone(const ArcAddition& change) const;


      bool checkModificationAlone(const ArcDeletion& change) const;


      bool checkModificationAlone(const ArcReversal& change) const;


      bool checkModificationAlone(const ArcTriangleDeletion1& change) const;


      bool checkModificationAlone(const ArcTriangleDeletion2& change) const;
 


      bool checkModificationAlone(const GraphChange& change) const;

      void setGraph(const DAG& graph);

      void setGraph(Size nb_nodes);

 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
// include the set of methods that enable the structural constraint to
// be standalone, i.e., that it needs not be included into a
// StructuralConstraintSetStatic to be used by learning algorithms
#  define GUM_CONSTRAINT_CLASS_NAME StructuralConstraintDAG
#  include <agrum/BN/learning/constraints/structuralConstraintPatternHeader.h>
#  undef GUM_CONSTRAINT_CLASS_NAME
#endif   // DOXYGEN_SHOULD_SKIP_THIS
 
      private:
      // the DiGraph on which we perform checks: it is better to use a DiGraph
      // here rather than a DAG because this will speed-up checking triangle
      // deletions (not enforcing checking the acyclicity for some graph
      // operations in which we know for sure that the graph cannot contain any
      // directed cycle)
      mutable DiGraph _graph_;
 
      // in order to check for directed acyclicity when performing operations
      // like arc reversals or triangle deletions, we will perform modifications
      // on _graph_. This will simplify the checking. In order to guaranty that
      // several threads do not mess with _graph_ (data races) or simply that
      // their computations are correct, we will use a spinlock. This should be
      // efficient because, usually, only 1 thread will perform these operations
      // at a time.
      mutable std::atomic_flag _lock_flag_ = ATOMIC_FLAG_INIT;

      void _lock_() const;

      void _unlock_() const;
    };
 
  } /* namespace learning */
 
} /* namespace gum */

#ifndef GUM_NO_INLINE
#  include <agrum/BN/learning/constraints/structuralConstraintDAG_inl.h>
#endif /* GUM_NO_INLINE */
 
#endif /* GUM_LEARNING_STRUCTURAL_CONSTRAINT_DAG_H */