Scippy

SCIP

Solving Constraint Integer Programs

struct_cutpool.h
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2 /* */
3 /* This file is part of the program and library */
4 /* SCIP --- Solving Constraint Integer Programs */
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6 /* Copyright 2002-2022 Zuse Institute Berlin */
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21 /* along with SCIP; see the file LICENSE. If not visit scipopt.org. */
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24 
25 /**@file struct_cutpool.h
26  * @ingroup INTERNALAPI
27  * @brief datastructures for storing cuts in a cut pool
28  * @author Tobias Achterberg
29  */
30 
31 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
32 
33 #ifndef __SCIP_STRUCT_CUTPOOL_H__
34 #define __SCIP_STRUCT_CUTPOOL_H__
35 
36 
37 #include "scip/def.h"
38 #include "scip/type_clock.h"
39 #include "scip/type_misc.h"
40 #include "scip/type_lp.h"
41 #include "scip/type_cutpool.h"
42 
43 #ifdef __cplusplus
44 extern "C" {
45 #endif
46 
47 /** datastructure for cuts in a cut pool */
48 struct SCIP_Cut
49 {
50  SCIP_ROW* row; /**< LP row of this cut */
51  SCIP_Longint processedlp; /**< last LP, where this cut was processed in separation of the LP solution */
52  SCIP_Longint processedlpsol; /**< last LP, where this cut was processed in separation of other solutions */
53  int age; /**< age of the cut: number of successive times, the cut was not violated */
54  int pos; /**< position of cut in the cuts array of the cut pool */
55 };
56 
57 /** storage for pooled cuts */
59 {
60  SCIP_Longint ncalls; /**< number of times, the cutpool was separated */
61  SCIP_Longint nrootcalls; /**< number of times, the cutpool was separated at the root */
62  SCIP_Longint ncutsfound; /**< total number of cuts that were added to the pool */
63  SCIP_Longint ncutsadded; /**< total number of cuts that were added from the pool */
64  SCIP_CLOCK* poolclock; /**< separation time */
65  SCIP_HASHTABLE* hashtable; /**< hash table to identify already stored cuts */
66  SCIP_CUT** cuts; /**< stored cuts of the pool */
67  SCIP_Longint processedlp; /**< last LP that has been processed for separating the LP */
68  SCIP_Longint processedlpsol; /**< last LP that has been processed for separating other solutions */
69  SCIP_Real processedlpefficacy;/**< minimal efficacy used in last processed LP */
70  SCIP_Real processedlpsolefficacy;/**< minimal efficacy used in last processed LP for separating other solutions */
71  int cutssize; /**< size of cuts array */
72  int ncuts; /**< number of cuts stored in the pool */
73  int nremovablecuts; /**< number of cuts stored in the pool that are marked to be removable */
74  int agelimit; /**< maximum age a cut can reach before it is deleted from the pool */
75  int firstunprocessed; /**< first cut that has not been processed in the last LP */
76  int firstunprocessedsol;/**< first cut that has not been processed in the last LP when separating other solutions */
77  SCIP_Longint maxncuts; /**< maximal number of cuts stored in the pool at the same time */
78  SCIP_Bool globalcutpool; /**< is this the global cut pool of SCIP? */
79 };
80 
81 #ifdef __cplusplus
82 }
83 #endif
84 
85 #endif
SCIP_ROW * row
SCIP_HASHTABLE * hashtable
type definitions for miscellaneous datastructures
SCIP_Longint processedlp
SCIP_Longint nrootcalls
SCIP_CUT ** cuts
SCIP_Longint processedlpsol
SCIP_Longint ncutsadded
SCIP_Real processedlpefficacy
SCIP_Longint processedlp
type definitions for LP management
type definitions for storing cuts in a cut pool
SCIP_Longint processedlpsol
SCIP_Real processedlpsolefficacy
#define SCIP_Bool
Definition: def.h:93
int firstunprocessedsol
type definitions for clocks and timing issues
SCIP_CLOCK * poolclock
SCIP_Longint maxncuts
SCIP_Longint ncalls
SCIP_Longint ncutsfound
#define SCIP_Real
Definition: def.h:186
#define SCIP_Longint
Definition: def.h:171
SCIP_Bool globalcutpool
common defines and data types used in all packages of SCIP