fmdpSimulator.cpp

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 *   Copyright (c) 2005-2025 by                                             *
 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
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 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
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// =====================================================================
#include <cstdlib>
//======================================================================
#include <agrum/base/core/utils_random.h>
//======================================================================
#include <agrum/FMDP/io/dat/fmdpDatReader.h>
#include <agrum/FMDP/simulation/fmdpSimulator.h>
 
//======================================================================
 
namespace gum {
 
  // ===========================================================================
  // Constructors, Destructors.
  // ===========================================================================
 
  /*
   * Default constructor.
   */
  FMDPSimulator::FMDPSimulator(const FMDP< double >* fmdp) :
      AbstractSimulator(), _fmdp_(const_cast< FMDP< double >* >(fmdp)), _loaded_(false) {
    GUM_CONSTRUCTOR(FMDPSimulator);
  }
 
  FMDPSimulator::FMDPSimulator(const std::string& ressource) : AbstractSimulator(), _loaded_(true) {
    GUM_CONSTRUCTOR(FMDPSimulator);
 
    _fmdp_ = new FMDP< double >(true);
    FMDPDatReader< double > reader(_fmdp_, ressource);
    reader.trace(false);
    reader.proceed();
  }
 
  /*
   * Default destructor.
   */
  FMDPSimulator::~FMDPSimulator() {
    GUM_DESTRUCTOR(FMDPSimulator);
    if (_loaded_) delete _fmdp_;
  }
 
  // ===========================================================================
  //
  // ===========================================================================
 
  void FMDPSimulator::perform(Idx actionId) {
    Instantiation newState;
    for (auto varIter = this->beginVariables(); varIter != this->endVariables(); ++varIter) {
      newState.add(**varIter);
      Instantiation transit(currentState_);
      transit.add(*(this->primeVar(*varIter)));
 
      double proba = randomProba();
      double cdd   = 0.0;
      for (transit.setFirstOut(currentState_); !transit.end(); transit.incOut(currentState_)) {
        cdd += this->transitionProbability_(*varIter, transit, actionId);
        if (proba <= cdd) {
          newState.chgVal(**varIter, transit.val(*(this->primeVar(*varIter))));
          break;
        }
      }
    }
    currentState_ = newState;
  }
 
 
}   // End of namespace gum