multiDimCombineAndProjectDefault.h

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/**
 *
 *   Copyright (c) 2005-2021 by Pierre-Henri WUILLEMIN(@LIP6) & Christophe GONZALES(@AMU)
 *   info_at_agrum_dot_org
 *
 *  This library is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */


/**
 * @file
 *
 * @author Christophe GONZALES(@AMU) and Pierre-Henri WUILLEMIN(@LIP6)
 */

#ifndef GUM_MULTI_DIM_COMBINE_AND_PROJECT_DEFAULT_H
#define GUM_MULTI_DIM_COMBINE_AND_PROJECT_DEFAULT_H

#include <agrum/tools/multidim/utils/operators/multiDimCombinationDefault.h>
#include <agrum/tools/multidim/utils/operators/multiDimCombineAndProject.h>
#include <agrum/tools/multidim/utils/operators/multiDimProjection.h>

namespace gum {

  // clang-format off
  /**
   * @class MultiDimCombineAndProjectDefault
   * @headerfile multiDimCombineAndProjectDefault.h <agrum/tools/multidim/operators/multiDimCombineAndProjectDefault.h>
   * @ingroup multidim_op_group
   *
   * @brief An efficient class for combining and projecting MultiDim tables
   */
  // clang-format on
  template < typename GUM_SCALAR, template < typename > class TABLE >
  class MultiDimCombineAndProjectDefault: public MultiDimCombineAndProject< GUM_SCALAR, TABLE > {
    public:
    // ========================================================================
    /// @name Constructors / Destructors
    // ========================================================================
    /// @{

    /// Default constructor
    MultiDimCombineAndProjectDefault(
       TABLE< GUM_SCALAR >* (*combine)(const TABLE< GUM_SCALAR >&, const TABLE< GUM_SCALAR >&),
       TABLE< GUM_SCALAR >* (*project)(const TABLE< GUM_SCALAR >&,
                                       const Set< const DiscreteVariable* >&));

    /// Copy constructor
    MultiDimCombineAndProjectDefault(const MultiDimCombineAndProjectDefault< GUM_SCALAR, TABLE >&);

    /// Destructor
    virtual ~MultiDimCombineAndProjectDefault();

    /**
     * @brief virtual constructor
     *
     * @return a new fresh MultiDimCombineAndProjectDefault with the same
     * combination and projection functions.
     */
    virtual MultiDimCombineAndProjectDefault< GUM_SCALAR, TABLE >* newFactory() const;

    /// @}
    // ========================================================================
    /// @name Accessors/Modifiers
    // ========================================================================
    /// @{

    /**
     * @brief creates and returns the result of the projection over the
     * variables not in del_vars of the combination of the tables within set
     *
     * @return a new freshly created TABLE which is the result of the
     * projection of the combination of all the TABLES passed in argument
     *
     * @throws InvalidArgumentsNumber exception is thrown if the set passed in
     * argument contains less than two elements.
     */
    virtual Set< const TABLE< GUM_SCALAR >* >
       combineAndProject(Set< const TABLE< GUM_SCALAR >* > set,
                         Set< const DiscreteVariable* >    del_vars);

    /// changes the function used for combining two TABLES
    virtual void setCombineFunction(TABLE< GUM_SCALAR >* (*combine)(const TABLE< GUM_SCALAR >&,
                                                                    const TABLE< GUM_SCALAR >&));

    /**
     * @brief changes the class that performs the combinations
     *
     * Combinations are performed by pair, the CombineFunction being the
     * function used to combine 2 tables, thus producing a new one. Of course,
     * when we have to combine, say T1 * T2 * T3 * T4, there are several ways
     * to do this computation. For instance, we might first compute T1 * T2,
     * then T3 * T4, and finally compute the product of the resulting two
     * tables. Or we might compute T1 * T2, then combine the result with T3,
     * and then combine the last result with T4. The CombinationClass is
     * responsible for determining which of these possibilities will actually
     * be used. Function setCombinationClass allows to change the
     * combinationClass and, thus, the way all those tables will be combined.
     */
    virtual void setCombinationClass(const MultiDimCombination< GUM_SCALAR, TABLE >& comb_class);

    /// Returns the current combination function
    virtual TABLE< GUM_SCALAR >* (*combineFunction())(const TABLE< GUM_SCALAR >&,
                                                      const TABLE< GUM_SCALAR >&);

    /// Changes the function used for projecting TABLES
    virtual void
       setProjectFunction(TABLE< GUM_SCALAR >* (*proj)(const TABLE< GUM_SCALAR >&,
                                                       const Set< const DiscreteVariable* >&));

    /**
     * @brief Changes the class that performs the projections.
     *
     * As for the combination class, it is possible to change the projection
     * class, thus defining a new projection behaviour.
     */
    virtual void setProjectionClass(const MultiDimProjection< GUM_SCALAR, TABLE >& proj_class);

    /// returns the current projection function
    virtual TABLE< GUM_SCALAR >* (*projectFunction())(const TABLE< GUM_SCALAR >&,
                                                      const Set< const DiscreteVariable* >&);

    /**
     * @brief returns a rough estimate of the number of operations that will be
     * performed to compute the combination.
     */
    virtual float nbOperations(const Set< const TABLE< GUM_SCALAR >* >& set,
                               const Set< const DiscreteVariable* >&    del_vars) const;

    /**
     * @brief returns a rough estimate of the number of operations that will be
     * performed to compute the combination.
     */
    virtual float nbOperations(const Set< const Sequence< const DiscreteVariable* >* >& set,
                               Set< const DiscreteVariable* > del_vars) const;

    /**
     * @brief returns the memory consumption used during the combinations and
     * projections
     *
     * Actually, this function does not return a precise account of the memory
     * used by the MultiDimCombineAndProject but a rough estimate based on the
     * size of the tables involved in the combinations and projections.
     *
     * @return a pair of memory consumption: the first one is the maximum
     * amount of memory used during the set of combinations and projections
     * performed, and the second one is the amount of memory still used at the
     * end of the function ( the memory used by the resulting tables )
     */
    virtual std::pair< long, long >
       memoryUsage(const Set< const TABLE< GUM_SCALAR >* >& set,
                   const Set< const DiscreteVariable* >&    del_vars) const;

    /**
     * @brief returns the memory consumption used during the combinations and
     * projections
     *
     * Actually, this function does not return a precise account of the memory
     * used by the MultiDimCombineAndProject but a rough estimate based on the
     * size of the tables involved in the combinations and projections.
     *
     * @return a pair of memory consumption: the first one is the maximum
     * amount of memory used during the set of combinations and projections
     * performed, and the second one is the amount of memory still used at the
     * end of the function ( the memory used by the resulting tables )
     */
    virtual std::pair< long, long >
       memoryUsage(const Set< const Sequence< const DiscreteVariable* >* >& set,
                   Set< const DiscreteVariable* >                           del_vars) const;

    /// @}

    private:
    /// the class used for the combinations
    MultiDimCombination< GUM_SCALAR, TABLE >* _combination_;

    /// the class used for the projections
    MultiDimProjection< GUM_SCALAR, TABLE >* _projection_;
  };

} /* namespace gum */

// always include the template implementation
#include <agrum/tools/multidim/utils/operators/multiDimCombineAndProjectDefault_tpl.h>

#endif /* GUM_MULTI_DIM_COMBINE_AND_PROJECT_DEFAULT_H */