1 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ 2 /* */ 3 /* This file is part of the program and library */ 4 /* SCIP --- Solving Constraint Integer Programs */ 5 /* */ 6 /* Copyright (c) 2002-2023 Zuse Institute Berlin (ZIB) */ 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, */ 16 /* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */ 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 sepa_aggregation.h 26 * @ingroup SEPARATORS 27 * @brief flow cover and complemented mixed integer rounding cuts separator (Marchand's version) 28 * @author Leona Gottwald 29 * @author Kati Wolter 30 * @author Tobias Achterberg 31 * 32 * For an overview see: 33 * 34 * Marchand, H., & Wolsey, L. A. (2001).@n 35 * Aggregation and mixed integer rounding to solve MIPs.@n 36 * Operations research, 49(3), 363-371. 37 * 38 * Some remarks: 39 * - In general, continuous variables are less prefered than integer variables, since their cut 40 * coefficient is worse. 41 * - We seek for aggregations that project out continuous variables that are far away from their bound, 42 * since if it is at its bound then it doesn't contribute to the violation 43 * - These aggregations are also useful for the flowcover separation, so after building an aggregation 44 * we try to generate a MIR cut and a flowcover cut. 45 * - We only keep the best cut. 46 */ 47 48 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/ 49 50 #ifndef __SCIP_SEPA_CMIR_H__ 51 #define __SCIP_SEPA_CMIR_H__ 52 53 54 #include "scip/def.h" 55 #include "scip/type_retcode.h" 56 #include "scip/type_scip.h" 57 58 #ifdef __cplusplus 59 extern "C" { 60 #endif 61 62 /** creates the aggregation separator and includes it in SCIP 63 * 64 * @ingroup SeparatorIncludes 65 */ 66 SCIP_EXPORT 67 SCIP_RETCODE SCIPincludeSepaAggregation( 68 SCIP* scip /**< SCIP data structure */ 69 ); 70 71 #ifdef __cplusplus 72 } 73 #endif 74 75 #endif 76