isoron
/
gtsp
Archived
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Refactoring

Browse Source
master
Alinson S. Xavier 11 years ago
parent ad8e20c62b
commit 67ca00a0e0
13 changed files with 487 additions and 365 deletions
Show Stats Download Patch File Download Diff File

1
CMakeLists.txt
Unescape View File

@ -8,7 +8,6 @@ set(CMAKE_SOURCE_DIR src)
set(CMAKE_C_FLAGS "-O3 -g -Wall -pedantic -g --std=c11 -Winline")
set(SOURCE_FILES
src/lp.c
src/lp.h

209
src/branch_and_cut.c
Unescape View File

@ -3,25 +3,81 @@
#include <math.h>
#include "lp.h"
#include "branch_and_cut.h"
#include "tsp.h"
#include "util.h"
int bnc_is_integral(double *x, int length);
static int BNC_solve_node(struct BNC *bnc, int depth);
int bnc_find_best_branch_var(double *x, int length);
static int BNC_branch_node(struct BNC *bnc, double *x, int depth);
int bnc_solve_node(
struct LP *lp, double *best_val, int ncount, int ecount, int *elist,
int depth)
static int BNC_is_integral(double *x, int num_cols);
static int BNC_find_best_branching_var(double *x, int num_cols);
int BNC_init(struct BNC *bnc)
{
int rval = 0;
bnc->lp = 0;
bnc->problem_data = 0;
bnc->problem_init_lp = 0;
bnc->problem_add_cutting_planes = 0;
bnc->lp = (struct LP *) malloc(sizeof(struct LP));
ABORT_IF(!bnc->lp, "could not allocate bnc->lp\n");
CLEANUP:
return rval;
}
void BNC_free(struct BNC *bnc)
{
if (!bnc) return;
if (bnc->lp)
{
LP_free(bnc->lp);
free(bnc->lp);
}
}
int BNC_init_lp(struct BNC *bnc)
{
int rval = 0;
time_printf("Initializing LP...\n");
rval = LP_open(bnc->lp);
ABORT_IF(rval, "LP_open failed\n");
rval = LP_create(bnc->lp, "subtour");
ABORT_IF(rval, "LP_create failed\n");
rval = bnc->problem_init_lp(bnc->lp, bnc->problem_data);
ABORT_IF(rval, "problem_init_lp failed\n");
rval = LP_write(bnc->lp, "subtour.lp");
ABORT_IF(rval, "LP_write failed\n");
CLEANUP:
return rval;
}
int BNC_solve(struct BNC *bnc)
{
return BNC_solve_node(bnc, 1);
}
static int BNC_solve_node(struct BNC *bnc, int depth)
{
struct LP *lp = bnc->lp;
double *best_val = &bnc->best_val;
int rval = 0;
double *x = (double *) NULL;
time_printf("Optimizing...\n");
int is_infeasible;
rval = lp_optimize(lp, &is_infeasible);
ABORT_IF (rval, "lp_optimize failed\n");
rval = LP_optimize(lp, &is_infeasible);
ABORT_IF (rval, "LP_optimize failed\n");
if (is_infeasible)
{
@ -30,8 +86,8 @@ int bnc_solve_node(
}
double objval;
rval = lp_get_obj_val(lp, &objval);
ABORT_IF (rval, "lp_get_obj_val failed\n");
rval = LP_get_obj_val(lp, &objval);
ABORT_IF (rval, "LP_get_obj_val failed\n");
time_printf(" objective value = %.2f\n", objval);
@ -43,25 +99,30 @@ int bnc_solve_node(
goto CLEANUP;
}
x = (double *) malloc(ecount * sizeof(double));
int num_cols = LP_get_num_cols(lp);
x = (double *) malloc(num_cols * sizeof(double));
ABORT_IF(!x, "could not allocate x\n");
rval = lp_get_x(lp, x);
ABORT_IF(rval, "lp_get_x failed\n");
rval = LP_get_x(lp, x);
ABORT_IF(rval, "LP_get_x failed\n");
rval = TSP_add_cutting_planes(ncount, ecount, elist, lp);
if (bnc->problem_add_cutting_planes)
{
rval = bnc->problem_add_cutting_planes(lp, bnc->problem_data);
ABORT_IF(rval, "TSP_add_cutting_planes failed\n");
}
rval = lp_optimize(lp, &is_infeasible);
ABORT_IF (rval, "lp_optimize failed\n");
rval = LP_optimize(lp, &is_infeasible);
ABORT_IF (rval, "LP_optimize failed\n");
rval = lp_get_obj_val(lp, &objval);
ABORT_IF(rval, "lp_get_obj_val failed\n");
rval = LP_get_obj_val(lp, &objval);
ABORT_IF(rval, "LP_get_obj_val failed\n");
rval = lp_get_x(lp, x);
ABORT_IF(rval, "lp_get_x failed\n");
rval = LP_get_x(lp, x);
ABORT_IF(rval, "LP_get_x failed\n");
if (bnc_is_integral(x, ecount))
if (BNC_is_integral(x, num_cols))
{
time_printf(" solution is integral\n");
@ -71,11 +132,12 @@ int bnc_solve_node(
time_printf("Found a better integral solution:\n");
time_printf(" objval = %.2lf **\n", objval);
}
} else
}
else
{
time_printf(" solution is fractional\n");
rval = bnc_branch_node(lp, x, ncount, ecount, depth, best_val, elist);
ABORT_IF(rval, "bnc_branch_node failed\n");
rval = BNC_branch_node(bnc, x, depth);
ABORT_IF(rval, "BNC_branch_node failed\n");
}
CLEANUP:
@ -83,95 +145,66 @@ int bnc_solve_node(
return rval;
}
int bnc_branch_node(
struct LP *lp, double *x, int ncount, int ecount, int depth,
double *best_val, int *elist)
static int BNC_branch_node(struct BNC *bnc, double *x, int depth)
{
int rval = 0;
int best_index = bnc_find_best_branch_var(x, ecount);
struct LP *lp = bnc->lp;
time_printf("Branching on variable x%d = %.6lf (depth %d)...\n", best_index,
x[best_index], depth);
int num_cols = LP_get_num_cols(lp);
int best_branch_var = BNC_find_best_branching_var(x, num_cols);
time_printf("Fixing variable x%d to one...\n", best_index);
rval = lp_change_bound(lp, best_index, 'L', 1.0);
ABORT_IF(rval, "lp_change_bound failed\n");
time_printf("Branching on variable x%d = %.6lf (depth %d)...\n",
best_branch_var, x[best_branch_var], depth);
rval = bnc_solve_node(lp, best_val, ncount, ecount, elist, depth + 1);
ABORT_IF(rval, "bnc_solve_node failed\n");
time_printf("Fixing variable x%d to one...\n", best_branch_var);
rval = LP_change_bound(lp, best_branch_var, 'L', 1.0);
ABORT_IF(rval, "LP_change_bound failed\n");
rval = lp_change_bound(lp, best_index, 'L', 0.0);
ABORT_IF(rval, "lp_change_bound failed\n");
rval = BNC_solve_node(bnc, depth + 1);
ABORT_IF(rval, "BNC_solve_node failed\n");
time_printf("Fixing variable x%d to zero...\n", best_index);
rval = lp_change_bound(lp, best_index, 'U', 0.0);
ABORT_IF(rval, "lp_change_bound failed\n");
rval = LP_change_bound(lp, best_branch_var, 'L', 0.0);
ABORT_IF(rval, "LP_change_bound failed\n");
rval = bnc_solve_node(lp, best_val, ncount, ecount, elist, depth + 1);
ABORT_IF(rval, "bnc_solve_node failed\n");
time_printf("Fixing variable x%d to zero...\n", best_branch_var);
rval = LP_change_bound(lp, best_branch_var, 'U', 0.0);
ABORT_IF(rval, "LP_change_bound failed\n");
rval = lp_change_bound(lp, best_index, 'U', 1.0);
ABORT_IF(rval, "lp_change_bound failed\n");
rval = BNC_solve_node(bnc, depth + 1);
ABORT_IF(rval, "BNC_solve_node failed\n");
time_printf("Finished branching on variable %d\n", best_index);
rval = LP_change_bound(lp, best_branch_var, 'U', 1.0);
ABORT_IF(rval, "LP_change_bound failed\n");
time_printf("Finished branching on variable %d\n", best_branch_var);
CLEANUP:
return rval;
}
int bnc_find_best_branch_var(double *x, int length)
static int BNC_is_integral(double *x, int num_cols)
{
int best_index = 0;
double best_index_frac = 1.0;
for (int i = 0; i < num_cols; i++)
if (x[i] > LP_EPSILON && x[i] < 1.0 - LP_EPSILON)
return 0;
for (int j = 0; j < length; j++)
{
if (fabs(x[j] - 0.5) < best_index_frac)
{
best_index = j;
best_index_frac = fabs(x[j] - 0.5);
}
}
return best_index;
return 1;
}
int bnc_is_integral(double *x, int length)
static int BNC_find_best_branching_var(double *x, int num_cols)
{
int all_integral = 1;
int best_index = 0;
double best_index_frac = 1.0;
for (int j = 0; j < length; j++)
for (int i = 0; i < num_cols; i++)
{
if (x[j] > LP_EPSILON && x[j] < 1.0 - LP_EPSILON)
if (fabs(x[i] - 0.5) < best_index_frac)
{
all_integral = 0;
break;
best_index = i;
best_index_frac = fabs(x[i] - 0.5);
}
}
return all_integral;
}
int bnc_init_lp(
struct LP *lp, int node_count, int edge_count, int *edge_list,
int *edge_weights)
{
int rval = 0;
time_printf("Initializing LP...\n");
rval = lp_open(lp);
ABORT_IF(rval, "lp_open failed\n");
rval = lp_create(lp, "subtour");
ABORT_IF(rval, "lp_create failed\n");
rval = TSP_init_lp(node_count, lp, edge_count, edge_weights, edge_list);
ABORT_IF(rval, "TSP_init_lp failed\n");
rval = lp_write(lp, "subtour.lp");
ABORT_IF(rval, "lp_write failed\n");
CLEANUP:
return rval;
return best_index;
}

24
src/branch_and_cut.h
Unescape View File

@ -3,15 +3,23 @@
#include "lp.h"
int bnc_solve_node(
struct LP *lp, double *best_val, int ncount, int ecount, int *elist,
int depth);
struct BNC
{
struct LP *lp;
double best_val;
int *problem_data;
int bnc_branch_node(
struct LP *lp, double *x, int ncount, int ecount, int depth,
double *current_val, int *elist);
int (*problem_init_lp)(struct LP *, void *);
int bnc_init_lp(
struct LP *lp, int node_count, int edge_count, int *edge_list, int *edge_weights);
int (*problem_add_cutting_planes)(struct LP *, void *);
};
int BNC_init(struct BNC *bnc);
int BNC_solve(struct BNC *bnc);
int BNC_init_lp(struct BNC *bnc);
void BNC_free(struct BNC *bnc);
#endif //_PROJECT_BRANCH_AND_CUT_H_

11
src/graph.c
Unescape View File

@ -55,7 +55,7 @@ int graph_build(int node_count, int edge_count, int *edge_list, struct Graph *G)
(struct AdjObj *) malloc(2 * edge_count * sizeof(struct AdjObj));
ABORT_IF(!G->node_list, "could not allocate G->node_list\n");
ABORT_IF(!G->adj_space, "out of memory for node_list or adj_space\n");
ABORT_IF(!G->adj_space, "could not allocate G->adj_space\n");
for (int i = 0; i < node_count; i++)
G->node_list[i].deg = 0;
@ -109,8 +109,13 @@ int euclid_edgelen(int i, int j, double *x, double *y)
}
void get_delta(
int island_node_count, int *island_nodes, int edge_count, int *edges,
int *delta_count, int *delta, int *marks)
int island_node_count,
int *island_nodes,
int edge_count,
int *edges,
int *delta_count,
int *delta,
int *marks)
{
for (int i = 0; i < island_node_count; i++)
marks[island_nodes[i]] = 1;

44
src/graph.h
Unescape View File

@ -1,8 +1,32 @@
#ifndef __GRAPH_H_
#define __GRAPH_H_
#ifndef _PROJECT_GRAPH_H_
#define _PROJECT_GRAPH_H_
#include "main.h"
struct AdjObj
{
/* Index of neighbor node */
int n;
/* Index of adj joining neighbor */
int e;
};
struct Node
{
int deg;
struct AdjObj *adj;
int mark;
};
struct Graph
{
int node_count;
int edge_count;
struct Node *node_list;
struct AdjObj *adj_space;
};
void graph_dfs(
int n, struct Graph *G, double *x, int *icount, int *island);
@ -10,12 +34,18 @@ void graph_init(struct Graph *G);
void graph_free(struct Graph *G);
int graph_build(int node_count, int edge_count, int *edge_list, struct Graph *G);
int graph_build
(int node_count, int edge_count, int *edge_list, struct Graph *G);
int euclid_edgelen(int i, int j, double *x, double *y);
void get_delta(
int nsize, int *nlist, int ecount, int *elist, int *deltacount,
int *delta, int *marks);
#endif //___GRAPH_H_
int nsize,
int *nlist,
int ecount,
int *elist,
int *deltacount,
int *delta,
int *marks);
#endif

55
src/lp.c
Unescape View File

@ -7,11 +7,11 @@
#define LP_EPSILON 0.000001
int lp_open(struct LP *lp)
int LP_open(struct LP *lp)
{
int rval = 0;
lp->cplex_lp = (CPXLPptr)NULL;
lp->cplex_lp = (CPXLPptr) NULL;
lp->cplex_env = CPXopenCPLEX(&rval);
if (rval)
{
@ -23,7 +23,7 @@ int lp_open(struct LP *lp)
return rval;
}
void lp_free(struct LP *lp)
void LP_free(struct LP *lp)
{
if (!lp) return;
if (!lp->cplex_env) return;
@ -35,7 +35,7 @@ void lp_free(struct LP *lp)
lp->cplex_env = 0;
}
int lp_create(struct LP *lp, const char *name)
int LP_create(struct LP *lp, const char *name)
{
int rval = 0;
char nambuf[MAX_NAME_LENGTH];
@ -52,12 +52,11 @@ int lp_create(struct LP *lp, const char *name)
return rval;
}
int lp_new_row(struct LP *lp, char sense, double rhs)
int LP_new_row(struct LP *lp, char sense, double rhs)
{
int rval = 0;
rval = CPXnewrows(lp->cplex_env, lp->cplex_lp, 1, &rhs, &sense,
(double *) NULL, (char **) NULL);
rval = CPXnewrows(lp->cplex_env, lp->cplex_lp, 1, &rhs, &sense, 0, 0);
ABORT_IF(rval, "CPXnewrows failed\n");
@ -65,14 +64,20 @@ int lp_new_row(struct LP *lp, char sense, double rhs)
return rval;
}
int lp_add_rows(
struct LP *lp, int newrows, int newnz, double *rhs, char *sense,
int *rmatbeg, int *rmatind, double *rmatval)
int LP_add_rows(
struct LP *lp,
int newrows,
int newnz,
double *rhs,
char *sense,
int *rmatbeg,
int *rmatind,
double *rmatval)
{
int rval = 0;
rval = CPXaddrows(lp->cplex_env, lp->cplex_lp, 0, newrows, newnz, rhs,
sense, rmatbeg, rmatind, rmatval, (char **) NULL, (char **) NULL);
sense, rmatbeg, rmatind, rmatval, 0, 0);
ABORT_IF(rval, "CPXaddrows failed\n");
@ -80,9 +85,16 @@ int lp_add_rows(
return rval;
}
int lp_add_cols(
struct LP *lp, int newcols, int newnz, double *obj, int *cmatbeg,
int *cmatind, double *cmatval, double *lb, double *ub)
int LP_add_cols(
struct LP *lp,
int newcols,
int newnz,
double *obj,
int *cmatbeg,
int *cmatind,
double *cmatval,
double *lb,
double *ub)
{
int rval = 0;
@ -95,7 +107,7 @@ int lp_add_cols(
return rval;
}
int lp_change_bound(struct LP *lp, int col, char lower_or_upper, double bnd)
int LP_change_bound(struct LP *lp, int col, char lower_or_upper, double bnd)
{
int rval = 0;
@ -107,7 +119,7 @@ int lp_change_bound(struct LP *lp, int col, char lower_or_upper, double bnd)
return rval;
}
int lp_optimize(struct LP *lp, int *infeasible)
int LP_optimize(struct LP *lp, int *infeasible)
{
int rval = 0, solstat;
@ -134,7 +146,7 @@ int lp_optimize(struct LP *lp, int *infeasible)
return rval;
}
int lp_get_obj_val(struct LP *lp, double *obj)
int LP_get_obj_val(struct LP *lp, double *obj)
{
int rval = 0;
@ -145,7 +157,7 @@ int lp_get_obj_val(struct LP *lp, double *obj)
return rval;
}
int lp_get_x(struct LP *lp, double *x)
int LP_get_x(struct LP *lp, double *x)
{
int rval = 0;
@ -159,7 +171,12 @@ int lp_get_x(struct LP *lp, double *x)
return rval;
}
int lp_write(struct LP *lp, const char *fname)
int LP_get_num_cols(struct LP *lp)
{
return CPXgetnumcols(lp->cplex_env, lp->cplex_lp);
}
int LP_write(struct LP *lp, const char *fname)
{
int rval = 0;

47
src/lp.h
Unescape View File

@ -1,5 +1,5 @@
#ifndef __MAIN_
#define __MAIN_
#ifndef _PROJECT_LP_H_
#define _PROJECT_LP_H_
#include <cplex.h>
@ -13,28 +13,45 @@ struct LP
static const int MAX_NAME_LENGTH = 100;
int lp_open(struct LP *lp);
int LP_open(struct LP *lp);
int lp_create(struct LP *lp, const char *name);
int LP_create(struct LP *lp, const char *name);
int lp_write(struct LP *lp, const char *fname);
int LP_write(struct LP *lp, const char *fname);
void lp_free(struct LP *lp);
void LP_free(struct LP *lp);
int lp_new_row(struct LP *lp, char sense, double rhs);
int LP_new_row(struct LP *lp, char sense, double rhs);
int lp_add_rows(struct LP *lp, int newrows, int newnz, double *rhs, char *sense,
int *rmatbeg, int *rmatind, double *rmatval);
int LP_add_rows(
struct LP *lp,
int newrows,
int newnz,
double *rhs,
char *sense,
int *rmatbeg,
int *rmatind,
double *rmatval);
int lp_add_cols(struct LP *lp, int newcols, int newnz, double *obj,
int *cmatbeg, int *cmatind, double *cmatval, double *lb, double *ub);
int LP_add_cols(
struct LP *lp,
int newcols,
int newnz,
double *obj,
int *cmatbeg,
int *cmatind,
double *cmatval,
double *lb,
double *ub);
int lp_change_bound(struct LP *lp, int col, char lower_or_upper, double bnd);
int LP_change_bound(struct LP *lp, int col, char lower_or_upper, double bnd);
int lp_optimize(struct LP *lp, int *infeasible);
int LP_optimize(struct LP *lp, int *infeasible);
int lp_get_obj_val(struct LP *lp, double *obj);
int LP_get_obj_val(struct LP *lp, double *obj);
int lp_get_x(struct LP *lp, double *x);
int LP_get_x(struct LP *lp, double *x);
int LP_get_num_cols(struct LP *lp);
#endif

112
src/main.c
Unescape View File

@ -7,82 +7,69 @@
#include "tsp.h"
#include "branch_and_cut.h"
char *fname = (char *) NULL;
int seed = 0;
int geometric_data = 0;
int ncount_rand = 0;
int gridsize_rand = 100;
int use_all_subtours = 0;
char *INPUT_FILENAME = 0;
unsigned int SEED = 0;
int GEOMETRIC_DATA = 0;
int NODE_COUNT_RAND = 0;
int GRID_SIZE_RAND = 100;
static int parse_arguments(int ac, char **av);
static void print_usage(char *f);
int main(int ac, char **av)
{
int rval = 0;
int *edge_weights = 0;
int *edge_list = 0;
int *tlist = 0;
seed = (int) util_get_current_time();
SEED = (unsigned int) get_current_time();
rval = parseargs(ac, av);
rval = parse_arguments(ac, av);
ABORT_IF(rval, "Failed to parse arguments.\n");
ABORT_IF(!fname && !ncount_rand, "Must specify a problem file or use -k for"
" random prob\n");
printf("Seed = %d\n", seed);
srand(seed);
if (fname)
{
printf("Problem name: %s\n", fname);
if (geometric_data) printf("Geometric data\n");
}
int node_count = 0, edge_count = 0;
rval = TSP_read_problem(fname, &node_count, &edge_count, &edge_list,
&edge_weights);
ABORT_IF(rval, "TSP_read_problem failed\n");
ABORT_IF(use_all_subtours && node_count > 20, "Too many nodes to add all"
" subtours\n");
printf("Seed = %d\n", SEED);
srand(SEED);
tlist = (int *) malloc((node_count) * sizeof(int));
struct BNC bnc;
struct TSPData data;
ABORT_IF(!tlist, "out of memory for tlist\n");
TSP_init_data(&data);
double best_val = TSP_find_initial_solution(edge_weights, edge_list,
node_count, edge_count);
rval = TSP_read_problem(INPUT_FILENAME, &data);
ABORT_IF(rval, "TSP_read_problem failed\n");
initial_time = util_get_current_time();
rval = BNC_init(&bnc);
ABORT_IF(rval, "BNC_init failed");
struct LP *lp;
lp = (struct LP *) malloc(sizeof(struct LP *));
bnc.best_val = TSP_find_initial_solution(&data);
bnc.problem_data = (void *) &data;
bnc.problem_init_lp = (int (*)(struct LP *, void *)) TSP_init_lp;
bnc.problem_add_cutting_planes =
(int (*)(struct LP *, void *)) TSP_add_cutting_planes;
rval = bnc_init_lp(lp, node_count, edge_count, edge_list, edge_weights);
ABORT_IF(rval, "bnc_init_lp failed\n");
rval = BNC_init_lp(&bnc);
ABORT_IF(rval, "BNC_init_lp failed");
rval = bnc_solve_node(lp, &best_val, node_count, edge_count, edge_list, 1);
ABORT_IF(rval, "bnc_solve_node failed\n");
rval = BNC_solve(&bnc);
ABORT_IF(rval, "BNC_solve_node failed\n");
time_printf("Optimal integral solution:\n");
time_printf(" objective value = %.2lf **\n", best_val);
printf("\nRunning Time: %.2f seconds\n",
util_get_current_time() - initial_time);
fflush(stdout);
time_printf(" obj value = %.2lf **\n", bnc.best_val);
CLEANUP:
if (tlist) free(tlist);
if (edge_list) free(edge_list);
if (edge_weights) free(edge_weights);
BNC_free(&bnc);
TSP_free_data(&data);
return rval;
}
int parseargs(int ac, char **av)
static int parse_arguments(int ac, char **av)
{
int rval = 0;
int c;
if (ac == 1)
{
usage(av[0]);
print_usage(av[0]);
return 1;
}
@ -90,46 +77,49 @@ int parseargs(int ac, char **av)
{
switch (c)
{
case 'a':
use_all_subtours = 1;
case 'a':;
break;
case 'b':
gridsize_rand = atoi(optarg);
GRID_SIZE_RAND = atoi(optarg);
break;
case 'g':
geometric_data = 1;
GEOMETRIC_DATA = 1;
break;
case 'k':
ncount_rand = atoi(optarg);
NODE_COUNT_RAND = atoi(optarg);
break;
case 's':
seed = atoi(optarg);
SEED = (unsigned) atoi(optarg);
break;
case '?':
default:
usage(av[0]);
print_usage(av[0]);
return 1;
}
}
if (optind < ac) fname = av[optind++];
if (optind < ac) INPUT_FILENAME = av[optind++];
if (optind != ac)
{
usage(av[0]);
print_usage(av[0]);
return 1;
}
return 0;
ABORT_IF(!INPUT_FILENAME && !NODE_COUNT_RAND,
"Must specify an input file or use -k for random problem\n");
CLEANUP:
return rval;
}
void usage(char *f)
static void print_usage(char *f)
{
fprintf(stderr, "Usage: %s [-see below-] [prob_file]\n"
" -a add all subtours cuts at once\n"
" -b d gridsize d for random problems\n"
" -g prob_file has x-y coordinates\n"
" -k d generate problem with d cities\n"
" -s d random seed\n", f);
" -s d random SEED\n", f);
}

45
src/main.h
Unescape View File

@ -1,39 +1,10 @@
#ifndef __MAIN_H_
#define __MAIN_H_
struct AdjObj
{
int n;
/* index of neighbor node */
int e; /* index of adj joining neighbor */
};
struct Node
{
int deg;
struct AdjObj *adj;
int mark;
};
struct Graph
{
int node_count;
int edge_count;
struct Node *node_list;
struct AdjObj *adj_space;
};
void usage(char *f);
int parseargs(int ac, char **av);
extern char *fname;
extern int seed;
extern int geometric_data;
extern int ncount_rand;
extern int gridsize_rand;
extern int use_all_subtours;
extern double initial_time;
#ifndef _PROJECT_MAIN_H_
#define _PROJECT_MAIN_H_
extern char *INPUT_FILENAME;
extern unsigned int SEED;
extern int GEOMETRIC_DATA;
extern int NODE_COUNT_RAND;
extern int GRID_SIZE_RAND;
#endif

118
src/tsp.c
Unescape View File

@ -4,17 +4,36 @@
#include "tsp.h"
#include "util.h"
int TSP_init_lp(
int node_count, struct LP *lp, int edge_count, int *edge_weights,
int *edge_list)
int TSP_init_data(struct TSPData *data)
{
data->node_count = 0;
data->edge_count = 0;
data->edge_weights = 0;
data->edge_list = 0;
return 0;
}
void TSP_free_data(struct TSPData *data)
{
if (data->edge_list) free(data->edge_list);
if (data->edge_weights) free(data->edge_weights);
}
int TSP_init_lp(struct LP *lp, struct TSPData *data)
{
int node_count = data->node_count;
int edge_count = data->edge_count;
int *edge_list = data->edge_list;
int *edge_weights = data->edge_weights;
int rval = 0;
/* Build a row for each degree equation */
for (int i = 0; i < node_count; i++)
{
rval = lp_new_row(lp, 'E', 2.0);
ABORT_IF(rval, "lp_new_row failed\n");
rval = LP_new_row(lp, 'E', 2.0);
ABORT_IF(rval, "LP_new_row failed\n");
}
/* Build a column for each edge of the graph */
@ -27,10 +46,10 @@ int TSP_init_lp(
double obj = (double) edge_weights[j];
int cmatind[] = {edge_list[2 * j], edge_list[2 * j + 1]};
rval = lp_add_cols(lp, 1, 2, &obj, &cmatbeg, cmatind, cmatval, &lb,
rval = LP_add_cols(lp, 1, 2, &obj, &cmatbeg, cmatind, cmatval, &lb,
&ub);
ABORT_IF(rval, "lp_add_cols failed\n");
ABORT_IF(rval, "LP_add_cols failed\n");
}
CLEANUP:
@ -38,8 +57,13 @@ int TSP_init_lp(
}
int TSP_find_violated_subtour_elimination_cut(
int ncount, int edge_count, int *edges, struct LP *lp)
struct LP *lp,
struct TSPData *data)
{
int ncount = data->node_count;
int edge_count = data->edge_count;
int *edges = data->edge_list;
int rval = 0;
int is_infeasible = 0;
@ -53,8 +77,8 @@ int TSP_find_violated_subtour_elimination_cut(
struct Graph G;
graph_init(&G);
rval = lp_optimize(lp, &is_infeasible);
ABORT_IF(rval, "lp_optimize failed\n");
rval = LP_optimize(lp, &is_infeasible);
ABORT_IF(rval, "LP_optimize failed\n");
ABORT_IF(is_infeasible, "LP is infeasible\n");
rval = graph_build(ncount, edge_count, edges, &G);
@ -77,8 +101,8 @@ int TSP_find_violated_subtour_elimination_cut(
for (int i = 0; i < ncount; i++)
marks[i] = 0;
rval = lp_get_x(lp, x);
ABORT_IF(rval, "lp_get_x failed\n");
rval = LP_get_x(lp, x);
ABORT_IF(rval, "LP_get_x failed\n");
int round = 0;
int delta_count = 0;
@ -87,7 +111,7 @@ int TSP_find_violated_subtour_elimination_cut(
while (!TSP_is_graph_connected(&G, x, &island_count, island_sizes,
island_start, island_nodes))
{
time_printf("Adding %d bnc_solve_node inequalities...\n", island_count);
time_printf("Adding %d BNC_solve_node inequalities...\n", island_count);
for (int i = 0; i < island_count; i++)
{
get_delta(island_sizes[i], island_nodes + island_start[i],
@ -99,19 +123,19 @@ int TSP_find_violated_subtour_elimination_cut(
time_printf("Reoptimizing (round %d)...\n", ++round);
ABORT_IF(rval, "TSP_add_subtour_elimination_cut failed");
rval = lp_optimize(lp, &is_infeasible);
ABORT_IF(rval, "lp_optimize failed\n");
rval = LP_optimize(lp, &is_infeasible);
ABORT_IF(rval, "LP_optimize failed\n");
ABORT_IF(is_infeasible, "LP is infeasible\n");
double objval = 0;
rval = lp_get_obj_val(lp, &objval);
ABORT_IF(rval, "lp_get_obj_val failed\n");
rval = LP_get_obj_val(lp, &objval);
ABORT_IF(rval, "LP_get_obj_val failed\n");
rval = lp_get_x(lp, x);
ABORT_IF(rval, "lp_get_x failed\n");
rval = LP_get_x(lp, x);
ABORT_IF(rval, "LP_get_x failed\n");
}
time_printf(" graph is TSP_is_graph_connected\n");
time_printf(" graph is connected\n");
CLEANUP:
graph_free(&G);
@ -122,7 +146,7 @@ int TSP_find_violated_subtour_elimination_cut(
return rval;
}
int TSP_add_subtour_elimination_cut(struct LP *lp, int deltacount, int *delta)
int TSP_add_subtour_elimination_cut(struct LP *lp, int delta_length, int *delta)
{
int rval = 0;
char sense = 'G';
@ -132,16 +156,16 @@ int TSP_add_subtour_elimination_cut(struct LP *lp, int deltacount, int *delta)
double *rmatval;
int *rmatind = delta;
rmatval = (double *) malloc(deltacount * sizeof(double));
rmatval = (double *) malloc(delta_length * sizeof(double));
ABORT_IF(!rmatval, "out of memory for rmatval\n");
for (int i = 0; i < deltacount; i++)
for (int i = 0; i < delta_length; i++)
rmatval[i] = 1.0;
rval = lp_add_rows(lp, 1, deltacount, &rhs, &sense, &rmatbeg, rmatind,
rval = LP_add_rows(lp, 1, delta_length, &rhs, &sense, &rmatbeg, rmatind,
rmatval);
ABORT_IF(rval, "lp_add_rows failed");
ABORT_IF(rval, "LP_add_rows failed");
CLEANUP:
if (rmatval) free(rmatval);
@ -149,8 +173,12 @@ int TSP_add_subtour_elimination_cut(struct LP *lp, int deltacount, int *delta)
}
int TSP_is_graph_connected(
struct Graph *G, double *x, int *island_count, int *island_sizes,
int *island_start, int *island_nodes)
struct Graph *G,
double *x,
int *island_count,
int *island_sizes,
int *island_start,
int *island_nodes)
{
for (int i = 0; i < G->node_count; i++)
{
@ -180,7 +208,11 @@ int TSP_is_graph_connected(
}
int TSP_find_closest_neighbor_tour(
int start, int node_count, int edge_count, int *edges, int *elen,
int start,
int node_count,
int edge_count,
int *edges,
int *elen,
int *path_length)
{
int rval;
@ -227,10 +259,13 @@ int TSP_find_closest_neighbor_tour(
return rval;
}
int TSP_read_problem(
char *filename, int *p_ncount, int *p_ecount, int **p_elist,
int **p_elen)
int TSP_read_problem(char *filename, struct TSPData *data)
{
int *p_ncount = &data->node_count;
int *p_ecount = &data->edge_count;
int **p_elist = &data->edge_list;
int **p_elen = &data->edge_weights;
struct _IO_FILE *f = (struct _IO_FILE *) NULL;
int i, j, end1, end2, w, rval = 0, ncount, ecount;
int *elist = (int *) NULL, *elen = (int *) NULL;
@ -246,7 +281,7 @@ int TSP_read_problem(
}
}
if (filename && geometric_data == 0)
if (filename && GEOMETRIC_DATA == 0)
{
if (fscanf(f, "%d %d", &ncount, &ecount) != 2)
{
@ -300,7 +335,7 @@ int TSP_read_problem(
}
else
{
ncount = ncount_rand;
ncount = NODE_COUNT_RAND;
}
x = (double *) malloc(ncount * sizeof(double));
@ -326,10 +361,10 @@ int TSP_read_problem(
}
else
{
rval = CO759_build_xy(ncount, x, y, gridsize_rand);
rval = build_random_2d_points(ncount, x, y, GRID_SIZE_RAND);
if (rval)
{
fprintf(stderr, "CO759_build_xy failed\n");
fprintf(stderr, "build_random_2d_points failed\n");
goto CLEANUP;
}
@ -385,29 +420,28 @@ int TSP_read_problem(
return rval;
}
int TSP_add_cutting_planes(int ncount, int ecount, int *elist, struct LP *lp)
int TSP_add_cutting_planes(struct LP *lp, struct TSPData *data)
{
int rval = 0;
rval = TSP_find_violated_subtour_elimination_cut(ncount, ecount, elist, lp);
rval = TSP_find_violated_subtour_elimination_cut(lp, data);
ABORT_IF (rval, "TSP_find_violated_subtour_elimination_cut failed\n");
CLEANUP:
return rval;
}
double TSP_find_initial_solution(
int *edge_weights, int *edge_list, int node_count, int edge_count)
double TSP_find_initial_solution(struct TSPData *data)
{
double best_val = 1e99;
time_printf("Finding closest neighbor tour\n");
for (int i = 0; i < node_count; i++)
for (int i = 0; i < data->node_count; i++)
{
int path_length = 0;
TSP_find_closest_neighbor_tour(i, node_count, edge_count, edge_list,
edge_weights, &path_length);
TSP_find_closest_neighbor_tour(i, data->node_count, data->edge_count,
data->edge_list, data->edge_weights, &path_length);
if (best_val > path_length) best_val = path_length;
}

53
src/tsp.h
Unescape View File

@ -1,39 +1,48 @@
//
// Created by isoron on 3/17/15.
//
#ifndef ___TSP_H_
#define ___TSP_H_
#ifndef _PROJECT_TSP_H_
#define _PROJECT_TSP_H_
#include "lp.h"
#include "graph.h"
int add_all_subtours(int ncount, int ecount, int *elist, struct LP *lp);
struct TSPData
{
int node_count;
int edge_count;
int *edge_list;
int *edge_weights;
};
int TSP_init_data(struct TSPData *data);
void TSP_free_data(struct TSPData *data);
int TSP_find_violated_subtour_elimination_cut
(int ncount, int ecount, int *elist, struct LP *lp);
(struct LP *lp, struct TSPData *data);
int TSP_is_graph_connected(
struct Graph *G, double *x, int *island_count, int *island_sizes,
int *island_start, int *island_nodes);
struct Graph *G,
double *x,
int *island_count,
int *island_sizes,
int *island_start,
int *island_nodes);
int TSP_find_closest_neighbor_tour(
int start, int node_count, int edge_count, int *edges, int *elen,
int start,
int node_count,
int edge_count,
int *edges,
int *elen,
int *path_length);
int TSP_add_subtour_elimination_cut(struct LP *lp, int deltacount, int *delta);
int TSP_add_subtour_elimination_cut(struct LP *lp, int delta_length, int *delta);
int TSP_read_problem(
char *filename, int *p_ncount, int *p_ecount, int **p_elist,
int **p_elen);
int TSP_read_problem(char *filename, struct TSPData *data);
int TSP_add_cutting_planes(int ncount, int ecount, int *elist, struct LP *lp);
int TSP_add_cutting_planes(struct LP *lp, struct TSPData *data);
int TSP_init_lp(
int node_count, struct LP *lp, int edge_count, int *edge_weights,
int *edge_list);
int TSP_init_lp(struct LP *lp, struct TSPData *data);
double TSP_find_initial_solution
(int *edge_weights, int *edge_list, int node_count, int edge_count);
double TSP_find_initial_solution(struct TSPData *data);
#endif //_PROJECT_TSP_H_
#endif

114
src/util.c
Unescape View File

@ -1,103 +1,111 @@
/****************************************************************************/
/* */
/* Utility Functions for CO759 */
/* */
/****************************************************************************/
#include "main.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/resource.h>
#include <stdarg.h>
#include "util.h"
double util_get_current_time(void)
double get_current_time(void)
{
struct rusage ru;
getrusage (RUSAGE_SELF, &ru);
getrusage(RUSAGE_SELF, &ru);
return ((double) ru.ru_utime.tv_sec) +
((double) ru.ru_utime.tv_usec)/1000000.0;
return ((double) ru.ru_utime.tv_sec)
+ ((double) ru.ru_utime.tv_usec) / 1000000.0;
}
/* function for creating a random set of points in unit square */
int CO759_build_xy (int ncount, double *xlist, double *ylist, int gridsize)
int build_random_2d_points(
int node_count, double *x_list, double *y_list, int grid_size)
{
int rval = 0, i, j, winner, x, y;
int **hit = (int **) NULL, *hitcount = (int *) NULL;
printf ("Random %d point set, gridsize = %d\n", ncount, gridsize);
fflush (stdout);
printf("Random %d point set, grid_size = %d\n", node_count, grid_size);
fflush(stdout);
hit = (int **) malloc (gridsize * sizeof (int *));
if (!hit) {
fprintf (stderr, "out of memory for hit\n");
rval = 1; goto CLEANUP;
hit = (int **) malloc(grid_size * sizeof(int *));
if (!hit)
{
fprintf(stderr, "out of memory for hit\n");
rval = 1;
goto CLEANUP;
}
for (i = 0; i < gridsize; i++) hit[i] = (int *) NULL;
hitcount = (int *) malloc (gridsize * sizeof (int));
if (!hitcount) {
fprintf (stderr, "out of memory for hitcount\n");
rval = 1; goto CLEANUP;
for (i = 0; i < grid_size; i++) hit[i] = (int *) NULL;
hitcount = (int *) malloc(grid_size * sizeof(int));
if (!hitcount)
{
fprintf(stderr, "out of memory for hitcount\n");
rval = 1;
goto CLEANUP;
}
for (i = 0; i < gridsize; i++) hitcount[i] = 0;
for (i = 0; i < grid_size; i++) hitcount[i] = 0;
for (i = 0; i < ncount; i++) {
for (i = 0; i < node_count; i++)
{
winner = 0;
do {
x = (int) (rand () % gridsize);
y = (int) (rand () % gridsize);
do
{
x = (int) (rand() % grid_size);
y = (int) (rand() % grid_size);
/* check to see if (x,y) is a duplicate point */
for (j = 0; j < hitcount[x]; j++) {
for (j = 0; j < hitcount[x]; j++)
{
if (hit[x][j] == y) break;
}
if (j == hitcount[x]) {
if (j == hitcount[x])
{
void *tmp_ptr = (void *) hit[x];
tmp_ptr = realloc (tmp_ptr, (hitcount[x]+1)*sizeof (int));
if (!tmp_ptr) {
fprintf (stderr, "out of member in realloc of hit\n");
rval = 1; goto CLEANUP;
tmp_ptr = realloc(tmp_ptr, (hitcount[x] + 1) * sizeof(int));
if (!tmp_ptr)
{
fprintf(stderr, "out of member in realloc of hit\n");
rval = 1;
goto CLEANUP;
}
hit[x] = (int *) tmp_ptr;
hit[x][hitcount[x]] = y;
hitcount[x]++;
winner = 1;
}
if (!winner) {
printf ("X"); fflush (stdout);
if (!winner)
{
printf("X");
fflush(stdout);
}
} while (!winner);
xlist[i] = (double) x;
ylist[i] = (double) y;
x_list[i] = (double) x;
y_list[i] = (double) y;
}
CLEANUP:
CLEANUP:
printf ("\n");
printf("\n");
if (hit) {
for (i = 0; i < gridsize; i++) {
if (hit[i]) free (hit[i]);
if (hit)
{
for (i = 0; i < grid_size; i++)
{
if (hit[i]) free(hit[i]);
}
free (hit);
free(hit);
}
if (hitcount) free (hitcount);
if (hitcount) free(hitcount);
return rval;
}
double initial_time = 0;
static double initial_time = 0;
void time_printf(const char *fmt, ...)
{
if(initial_time == 0)
initial_time = util_get_current_time();
if (initial_time == 0)
initial_time = get_current_time();
printf("[%10.2lf] ", util_get_current_time() - initial_time);
printf("[%10.2lf] ", get_current_time() - initial_time);
va_list args;
va_start(args, fmt);
@ -107,9 +115,9 @@ void time_printf(const char *fmt, ...)
fflush(stdout);
}
void next_set (int sz, int *Set)
void next_set(int sz, int *set)
{
int i;
for (i=0; i < sz-1 && Set[i]+1 == Set[i+1]; i++) Set[i] = i;
Set[i] = Set[i]+1;
for (i = 0; i < sz - 1 && set[i] + 1 == set[i + 1]; i++) set[i] = i;
set[i] = set[i] + 1;
}

15
src/util.h
Unescape View File

@ -1,17 +1,18 @@
#ifndef __CO759_UTIL_H
#define __CO759_UTIL_H
#ifndef _PROJECT_UTIL_H_
#define _PROJECT_UTIL_H_
#define ABORT_IF(cond, msg) if(cond) { \
fprintf(stderr, msg); rval = 1; goto CLEANUP; }
double util_get_current_time(void);
double get_current_time(void);
int CO759_build_xy(int ncount, double *xlist, double *ylist, int gridsize);
int build_random_2d_points
(int node_count, double *x_list, double *y_list, int grid_size);
double util_get_current_time(void);
double get_current_time(void);
void time_printf(const char *fmt, ...);
void next_set(int sz, int *Set);
void next_set(int sz, int *set);
#endif /* __CO759_UTIL_H */
#endif