Scippy

SCIP

Solving Constraint Integer Programs

heur_feaspump.h
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1 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
2 /* */
3 /* This file is part of the program and library */
4 /* SCIP --- Solving Constraint Integer Programs */
5 /* */
6 /* Copyright 2002-2022 Zuse Institute Berlin */
7 /* */
8 /* Licensed under the Apache License, Version 2.0 (the "License"); */
9 /* you may not use this file except in compliance with the License. */
10 /* You may obtain a copy of the License at */
11 /* */
12 /* http://www.apache.org/licenses/LICENSE-2.0 */
13 /* */
14 /* Unless required by applicable law or agreed to in writing, software */
15 /* distributed under the License is distributed on an "AS IS" BASIS, */
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17 /* See the License for the specific language governing permissions and */
18 /* limitations under the License. */
19 /* */
20 /* You should have received a copy of the Apache-2.0 license */
21 /* along with SCIP; see the file LICENSE. If not visit scipopt.org. */
22 /* */
23 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
24 
25 /**@file heur_feaspump.h
26  * @ingroup PRIMALHEURISTICS
27  * @brief Objective Feasibility Pump 2.0
28  * @author Timo Berthold
29  * @author Domenico Salvagnin
30  *
31  * The fundamental idea of the Feasibility Pump is to construct two sequences of points which hopefully converge to a
32  * feasible solution. One sequence consists of LP-feasiblepoints, the other one of integer feasible points. They are
33  * produced by alternately rounding an LP-feasible point and solvng an LP that finds a point on the LP polyhedron which
34  * is closest to the rounded, integral point (w.r.t. Manhattan distance).
35  *
36  * The version implemented in SCIP supports using an Objective Feasibility Pump that uses a convex combination of the
37  * Manhattan distance and the original LP objective for reoptimization. It further features Feasibility Pump 2.0
38  * capabilities, hence propagating the fixings for a faster convergence.
39  */
40 
41 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
42 
43 #ifndef __SCIP_HEUR_FEASPUMP_H__
44 #define __SCIP_HEUR_FEASPUMP_H__
45 
46 #include "scip/def.h"
47 #include "scip/type_retcode.h"
48 #include "scip/type_scip.h"
49 
50 #ifdef __cplusplus
51 extern "C" {
52 #endif
53 
54 /** creates the feaspump primal heuristic and includes it in SCIP
55  *
56  * @ingroup PrimalHeuristicIncludes
57  */
58 SCIP_EXPORT
60  SCIP* scip /**< SCIP data structure */
61  );
62 
63 #ifdef __cplusplus
64 }
65 #endif
66 
67 #endif
enum SCIP_Retcode SCIP_RETCODE
Definition: type_retcode.h:63
type definitions for return codes for SCIP methods
type definitions for SCIP&#39;s main datastructure
SCIP_RETCODE SCIPincludeHeurFeaspump(SCIP *scip)
common defines and data types used in all packages of SCIP