1 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ 2 /* */ 3 /* This file is part of the program and library */ 4 /* SCIP --- Solving Constraint Integer Programs */ 5 /* */ 6 /* Copyright (C) 2002-2021 Konrad-Zuse-Zentrum */ 7 /* fuer Informationstechnik Berlin */ 8 /* */ 9 /* SCIP is distributed under the terms of the ZIB Academic License. */ 10 /* */ 11 /* You should have received a copy of the ZIB Academic License */ 12 /* along with SCIP; see the file COPYING. If not visit scipopt.org. */ 13 /* */ 14 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ 15 16 /**@file heur_nlpdiving.h 17 * @ingroup PRIMALHEURISTICS 18 * @brief NLP diving heuristic that chooses fixings w.r.t. the fractionalities 19 * @author Timo Berthold 20 * @author Stefan Vigerske 21 * 22 * Diving heuristic: Iteratively fixes some fractional variable and resolves the NLP-relaxation, thereby simulating a 23 * depth-first-search in the tree. Fractional Diving chooses the variable with the highest fractionality and rounds it to the 24 * nearest integer. One-level backtracking is applied: If the NLP gets infeasible, the last fixing is undone, and the 25 * opposite fixing is tried. If this is infeasible, too, the procedure aborts. 26 */ 27 28 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/ 29 30 #ifndef __SCIP_HEUR_NLPDIVING_H__ 31 #define __SCIP_HEUR_NLPDIVING_H__ 32 33 #include "scip/def.h" 34 #include "scip/type_retcode.h" 35 #include "scip/type_scip.h" 36 37 #ifdef __cplusplus 38 extern "C" { 39 #endif 40 41 /** creates the fracdiving heuristic and includes it in SCIP 42 * 43 * @ingroup PrimalHeuristicIncludes 44 */ 45 SCIP_EXPORT 46 SCIP_RETCODE SCIPincludeHeurNlpdiving( 47 SCIP* scip /**< SCIP data structure */ 48 ); 49 50 #ifdef __cplusplus 51 } 52 #endif 53 54 #endif 55