graphChangesGenerator4UndiGraph_tpl.h

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/****************************************************************************
 *   This file is part of the aGrUM/pyAgrum library.                        *
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 *   Copyright (c) 2005-2025 by                                             *
 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
 *                                                                          *
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 *   SPDX-FileCopyrightText: Copyright 2005-2025                            *
 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
 *   SPDX-License-Identifier: LGPL-3.0-or-later OR MIT                      *
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 *   Contact  : info_at_agrum_dot_org                                       *
 *   homepage : http://agrum.gitlab.io                                      *
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#pragma once
 

#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
namespace gum {
 
  namespace learning {

    template < typename STRUCT_CONSTRAINT >
    GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >::GraphChangesGenerator4UndiGraph(
        STRUCT_CONSTRAINT& constraint) : constraint_(&constraint) {
      GUM_CONSTRUCTOR(GraphChangesGenerator4UndiGraph);
    }

    template < typename STRUCT_CONSTRAINT >
    GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >::GraphChangesGenerator4UndiGraph(
        const GraphChangesGenerator4UndiGraph& from) :
        graph_(from.graph_), constraint_(from.constraint_), legal_changes_(from.legal_changes_),
        _max_threads_number_(from._max_threads_number_) {
      GUM_CONS_CPY(GraphChangesGenerator4UndiGraph);
    }

    template < typename STRUCT_CONSTRAINT >
    GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >::GraphChangesGenerator4UndiGraph(
        GraphChangesGenerator4UndiGraph&& from) :
        graph_(std::move(from.graph_)), constraint_(from.constraint_),
        legal_changes_(std::move(from.legal_changes_)),
        _max_threads_number_(from._max_threads_number_) {
      GUM_CONS_MOV(GraphChangesGenerator4UndiGraph);
    }

    template < typename STRUCT_CONSTRAINT >
    GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >::~GraphChangesGenerator4UndiGraph() {
      GUM_DESTRUCTOR(GraphChangesGenerator4UndiGraph);
    }

    template < typename STRUCT_CONSTRAINT >
    GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >&
        GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >::operator=(
            const GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >& from) {
      if (this != &from) {
        graph_               = from.graph_;
        constraint_          = from.constraint_;
        legal_changes_       = from.legal_changes_;
        _max_threads_number_ = from._max_threads_number_;
      }
      return *this;
    }

    template < typename STRUCT_CONSTRAINT >
    GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >&
        GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >::operator=(
            GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >&& from) {
      if (this != &from) {
        graph_               = std::move(from.graph_);
        constraint_          = std::move(from.constraint_);
        legal_changes_       = std::move(from.legal_changes_);
        _max_threads_number_ = from._max_threads_number_;
      }
      return *this;
    }

    template < typename STRUCT_CONSTRAINT >
    void GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >::createChanges_() {
      legal_changes_.clear();
 
      // for all the pairs of nodes, consider adding, reverse and removing arcs
      // do it for each thread
      const Size                        nb_threads = _max_threads_number_;
      std::vector< Set< GraphChange > > legal_changes(nb_threads);
 
      // create the lambda that will be used to fill the legal changes
      auto threadedLegalSet = [this, &legal_changes](const std::size_t this_thread,
                                                     const std::size_t nb_threads) -> void {
        Idx i = 0;
        for (const auto node1: this->graph_) {
          if (i == this_thread) {
            for (const auto node2: this->graph_) {
              if (node1 != node2) {
                // try edge additions
                EdgeAddition edge_add(node1, node2);
                if (!this->constraint_->isAlwaysInvalid(edge_add)) {
                  legal_changes[this_thread].insert(std::move(edge_add));
                }
 
                // try edge deletion
                EdgeDeletion edge_del(node1, node2);
                if (!this->constraint_->isAlwaysInvalid(edge_del)) {
                  legal_changes[this_thread].insert(std::move(edge_del));
                }
              }
            }
          }
          ++i;
          i %= nb_threads;
        }
      };
 
      // launch the threads
      ThreadExecutor::execute(nb_threads, threadedLegalSet);
 
 
      // now store the changes into the protected vectors of the
      // GraphChangesGenerator4UndiGraph
      for (const auto& changes: legal_changes) {
        for (const auto& change: changes) {
          legal_changes_.insert(std::move(change));
        }
      }
    }

    template < typename STRUCT_CONSTRAINT >
    INLINE void
        GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >::setGraph(const UndiGraph& graph) {
      // sets the current graph
      graph_ = graph;
 
      // generate the set of all changes
      createChanges_();
    }

    template < typename STRUCT_CONSTRAINT >
    INLINE void GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >::clearChanges() noexcept {
      legal_changes_.clear();
    }

    template < typename STRUCT_CONSTRAINT >
    INLINE typename GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >::iterator
        GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >::begin() const {
      return legal_changes_.cbegin();
    }

    template < typename STRUCT_CONSTRAINT >
    INLINE const typename GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >::iterator&
        GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >::end() const {
      return legal_changes_.cend();
    }

    template < typename STRUCT_CONSTRAINT >
    INLINE void GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >::modifyGraph(
        const EdgeAddition& change) {}

    template < typename STRUCT_CONSTRAINT >
    INLINE void GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >::modifyGraph(
        const EdgeDeletion& change) {}

    template < typename STRUCT_CONSTRAINT >
    INLINE void GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >::modifyGraph(
        const GraphChange& change) {}

    template < typename STRUCT_CONSTRAINT >
    INLINE void GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >::notifyGetCompleted() {
      if (legal_changes_.size()) legal_changes_.clear();
    }

    template < typename STRUCT_CONSTRAINT >
    INLINE void
        GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >::setMaxNbThreads(Size nb) noexcept {
      if (nb == 0) nb = gum::getNumberOfThreads();
      _max_threads_number_ = nb;
    }

    template < typename STRUCT_CONSTRAINT >
    INLINE STRUCT_CONSTRAINT&
        GraphChangesGenerator4UndiGraph< STRUCT_CONSTRAINT >::constraint() const noexcept {
      return *constraint_;
    }
 
  } /* namespace learning */
 
} /* namespace gum */
 
#endif /* DOXYGEN_SHOULD_SKIP_THIS */