lemon/cbc.h
author Peter Kovacs <kpeter@inf.elte.hu>
Tue, 15 Mar 2011 19:32:21 +0100
changeset 936 ddd3c0d3d9bf
parent 746 e4554cd6b2bf
child 1064 fc3854d936f7
permissions -rw-r--r--
Implement the scaling Price Refinement heuristic in CostScaling (#417)
instead of Early Termination.

These two heuristics are similar, but the newer one is faster
and not only makes it possible to skip some epsilon phases, but
it can improve the performance of the other phases, as well.
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/* -*- mode: C++; indent-tabs-mode: nil; -*-
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 *
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 * This file is a part of LEMON, a generic C++ optimization library.
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 *
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 * Copyright (C) 2003-2010
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 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
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 * (Egervary Research Group on Combinatorial Optimization, EGRES).
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 *
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 * Permission to use, modify and distribute this software is granted
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 * provided that this copyright notice appears in all copies. For
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 * precise terms see the accompanying LICENSE file.
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 *
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 * This software is provided "AS IS" with no warranty of any kind,
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 * express or implied, and with no claim as to its suitability for any
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 * purpose.
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 *
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 */
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// -*- C++ -*-
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#ifndef LEMON_CBC_H
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#define LEMON_CBC_H
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///\file
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///\brief Header of the LEMON-CBC mip solver interface.
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///\ingroup lp_group
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#include <lemon/lp_base.h>
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class CoinModel;
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class OsiSolverInterface;
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class CbcModel;
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namespace lemon {
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  /// \brief Interface for the CBC MIP solver
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  ///
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  /// This class implements an interface for the CBC MIP solver.
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  ///\ingroup lp_group
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  class CbcMip : public MipSolver {
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  protected:
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    CoinModel *_prob;
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    OsiSolverInterface *_osi_solver;
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    CbcModel *_cbc_model;
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  public:
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    /// \e
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    CbcMip();
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    /// \e
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    CbcMip(const CbcMip&);
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    /// \e
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    ~CbcMip();
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    /// \e
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    virtual CbcMip* newSolver() const;
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    /// \e
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    virtual CbcMip* cloneSolver() const;
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  protected:
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    virtual const char* _solverName() const;
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    virtual int _addCol();
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    virtual int _addRow();
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    virtual int _addRow(Value l, ExprIterator b, ExprIterator e, Value u);
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    virtual void _eraseCol(int i);
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    virtual void _eraseRow(int i);
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    virtual void _eraseColId(int i);
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    virtual void _eraseRowId(int i);
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    virtual void _getColName(int col, std::string& name) const;
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    virtual void _setColName(int col, const std::string& name);
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    virtual int _colByName(const std::string& name) const;
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    virtual void _getRowName(int row, std::string& name) const;
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    virtual void _setRowName(int row, const std::string& name);
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    virtual int _rowByName(const std::string& name) const;
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    virtual void _setRowCoeffs(int i, ExprIterator b, ExprIterator e);
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    virtual void _getRowCoeffs(int i, InsertIterator b) const;
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    virtual void _setColCoeffs(int i, ExprIterator b, ExprIterator e);
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    virtual void _getColCoeffs(int i, InsertIterator b) const;
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    virtual void _setCoeff(int row, int col, Value value);
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    virtual Value _getCoeff(int row, int col) const;
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    virtual void _setColLowerBound(int i, Value value);
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    virtual Value _getColLowerBound(int i) const;
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    virtual void _setColUpperBound(int i, Value value);
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    virtual Value _getColUpperBound(int i) const;
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    virtual void _setRowLowerBound(int i, Value value);
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    virtual Value _getRowLowerBound(int i) const;
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    virtual void _setRowUpperBound(int i, Value value);
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    virtual Value _getRowUpperBound(int i) const;
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    virtual void _setObjCoeffs(ExprIterator b, ExprIterator e);
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    virtual void _getObjCoeffs(InsertIterator b) const;
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    virtual void _setObjCoeff(int i, Value obj_coef);
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    virtual Value _getObjCoeff(int i) const;
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    virtual void _setSense(Sense sense);
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    virtual Sense _getSense() const;
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    virtual ColTypes _getColType(int col) const;
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    virtual void _setColType(int col, ColTypes col_type);
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    virtual SolveExitStatus _solve();
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    virtual ProblemType _getType() const;
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    virtual Value _getSol(int i) const;
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    virtual Value _getSolValue() const;
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    virtual void _clear();
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    virtual void _messageLevel(MessageLevel level);
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    void _applyMessageLevel();
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    int _message_level;
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  };
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}
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#endif