treeOperator_tpl.h

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/****************************************************************************
 *   This file is part of the aGrUM/pyAgrum library.                        *
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 *   Copyright (c) 2005-2026 by                                             *
 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
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 *   SPDX-FileCopyrightText: Copyright 2005-2026                            *
 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
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#pragma once
 

 
#include <agrum/base/multidim/utils/FunctionGraphUtilities/internalNode.h>
#include <agrum/base/multidim/utils/FunctionGraphUtilities/operators/treeOperator.h>
 
#define ALLOCATE(x)      SmallObjectAllocator::instance().allocate(x)
#define DEALLOCATE(x, y) SmallObjectAllocator::instance().deallocate(x, y)
 
namespace gum {
 
  template < typename GUM_ELEMENT,
             template < typename > class COMBINEOPERATOR,
             template < typename > class TerminalNodePolicy >
  TreeOperator< GUM_ELEMENT, COMBINEOPERATOR, TerminalNodePolicy >::TreeOperator(
      const MultiDimFunctionGraph< GUM_ELEMENT, TerminalNodePolicy >* dt1,
      const MultiDimFunctionGraph< GUM_ELEMENT, TerminalNodePolicy >* dt2) :
      _dt1_(dt1), _dt2_(dt2), _combine_() {
    GUM_CONSTRUCTOR(TreeOperator);
 
    _rd_ = MultiDimFunctionGraph< GUM_ELEMENT, TerminalNodePolicy >::getTreeInstance();
  }
 
  template < typename GUM_ELEMENT,
             template < typename > class COMBINEOPERATOR,
             template < typename > class TerminalNodePolicy >
  TreeOperator< GUM_ELEMENT, COMBINEOPERATOR, TerminalNodePolicy >::TreeOperator(
      const MultiDimFunctionGraph< GUM_ELEMENT, TerminalNodePolicy >* dt1,
      const MultiDimFunctionGraph< GUM_ELEMENT, TerminalNodePolicy >* dt2,
      const HashTable< const DiscreteVariable*, Idx >                 givenContext) :
      _dt1_(dt1), _dt2_(dt2), _combine_(), _context_(givenContext) {
    GUM_CONSTRUCTOR(TreeOperator);
 
    _rd_ = MultiDimFunctionGraph< GUM_ELEMENT, TerminalNodePolicy >::getTreeInstance();
  }
 
  template < typename GUM_ELEMENT,
             template < typename > class COMBINEOPERATOR,
             template < typename > class TerminalNodePolicy >
  TreeOperator< GUM_ELEMENT, COMBINEOPERATOR, TerminalNodePolicy >::~TreeOperator() {
    GUM_DESTRUCTOR(TreeOperator);
  }
 
  // This function is the main function. To be call every time an operation
  // between the two given Function Graphs is required
  template < typename GUM_ELEMENT,
             template < typename > class COMBINEOPERATOR,
             template < typename > class TerminalNodePolicy >
  MultiDimFunctionGraph< GUM_ELEMENT, TerminalNodePolicy >*
      TreeOperator< GUM_ELEMENT, COMBINEOPERATOR, TerminalNodePolicy >::compute() {
    _rd_->manager()->setRootNode(_xPloreDT1_(_dt1_->root()));
 
    return _rd_;
  }
 
  // Main recursion function, called every time we move on a node to determine
  // what we have to do
  template < typename GUM_ELEMENT,
             template < typename > class COMBINEOPERATOR,
             template < typename > class TerminalNodePolicy >
  NodeId TreeOperator< GUM_ELEMENT, COMBINEOPERATOR, TerminalNodePolicy >::_xPloreDT1_(
      NodeId currentNodeId) {
    if (_dt1_->isTerminalNode(currentNodeId)) {
      _curDT1Leaf_ = currentNodeId;
      return _xPloreDT2_(_dt2_->root());
    }
 
    const InternalNode* currentNode = _dt1_->node(currentNodeId);
 
    if (!_rd_->variablesSequence().exists(currentNode->nodeVar()))
      _rd_->add(*(currentNode->nodeVar()));
 
    NodeId* sonsMap
        = static_cast< NodeId* >(ALLOCATE(sizeof(NodeId) * currentNode->nodeVar()->domainSize()));
    for (Idx moda = 0; moda < currentNode->nodeVar()->domainSize(); ++moda) {
      _context_.insert(currentNode->nodeVar(), moda);
      sonsMap[moda] = _xPloreDT1_(currentNode->son(moda));
      _context_.erase(currentNode->nodeVar());
    }
    return _checkRedundancy_(currentNode->nodeVar(), sonsMap);
  }
 
  template < typename GUM_ELEMENT,
             template < typename > class COMBINEOPERATOR,
             template < typename > class TerminalNodePolicy >
  NodeId TreeOperator< GUM_ELEMENT, COMBINEOPERATOR, TerminalNodePolicy >::_xPloreDT2_(
      NodeId currentNodeId) {
    if (_dt2_->isTerminalNode(currentNodeId))
      return _rd_->manager()->addTerminalNode(
          _combine_(_dt1_->nodeValue(_curDT1Leaf_), _dt2_->nodeValue(currentNodeId)));
 
    const InternalNode* currentNode = _dt2_->node(currentNodeId);
 
    if (!_rd_->variablesSequence().exists(currentNode->nodeVar()))
      _rd_->add(*(currentNode->nodeVar()));
 
    if (_context_.exists(currentNode->nodeVar()))
      return _xPloreDT2_(currentNode->son(_context_[currentNode->nodeVar()]));
 
    NodeId* sonsMap
        = static_cast< NodeId* >(ALLOCATE(sizeof(NodeId) * currentNode->nodeVar()->domainSize()));
    for (Idx moda = 0; moda < currentNode->nodeVar()->domainSize(); ++moda) {
      _context_.insert(currentNode->nodeVar(), moda);
      sonsMap[moda] = _xPloreDT2_(currentNode->son(moda));
      _context_.erase(currentNode->nodeVar());
    }
    return _checkRedundancy_(currentNode->nodeVar(), sonsMap);
  }
 
  template < typename GUM_ELEMENT,
             template < typename > class COMBINEOPERATOR,
             template < typename > class TerminalNodePolicy >
  NodeId TreeOperator< GUM_ELEMENT, COMBINEOPERATOR, TerminalNodePolicy >::_checkRedundancy_(
      const DiscreteVariable* var,
      NodeId*                 sonsMap) {
    bool diff = false;
    for (Idx moda = 1; moda < var->domainSize() && !diff; ++moda)
      if (sonsMap[0] != sonsMap[moda]) diff = true;
 
    if (!diff) {
      NodeId zero = sonsMap[0];
      DEALLOCATE(sonsMap, sizeof(NodeId) * var->domainSize());
      return zero;
    }
 
    return _rd_->manager()->addInternalNode(var, sonsMap);
  }
 
}   // namespace gum