#include "minimise.h"
#include "mgraph.h"
-#include <gsl/gsl_errno.h>
-#include <gsl/gsl_multimin.h>
-
-#include <signal.h>
-#include <sys/time.h>
-
-static const char *input_file, *output_file;
-static char *output_file_tmp;
-
static void compute_vertex_areas(const Vertices vertices, double areas[N]);
static double best_energy= DBL_MAX;
-enum printing_instance { pr_cost, pr_size, pr__max };
-
static void addcost(double *energy, double tweight, double tcost, int pr);
#define COST(weight, compute) addcost(&energy, (weight), (compute), printing)
-static int printing_check(enum printing_instance);
-static void printing_init(void);
/*---------- main energy computation and subroutines ----------*/
-static double compute_energy(const Vertices vertices) {
+double compute_energy(const struct Vertices *vs) {
double vertex_areas[N], energy;
int printing;
- compute_vertex_areas(vertices,vertex_areas);
+ compute_vertex_areas(vs->a, vertex_areas);
energy= 0;
printing= printing_check(pr_cost);
if (printing) printf("cost > energy |");
- COST(1e2, edgewise_vertex_displacement_cost(vertices));
- COST(1e2, graph_layout_cost(vertices,vertex_areas));
-// COST(1e4, noncircular_rim_cost(vertices));
+ COST(1e2, edgewise_vertex_displacement_cost(vs->a));
+ COST(1e2, graph_layout_cost(vs->a,vertex_areas));
+// COST(1e4, noncircular_rim_cost(vs->a));
if (printing) printf("| total %# e |", energy);
if (printing) printf(" BEST");
best_f= fopen(output_file_tmp,"wb"); if (!best_f) diee("fopen new out");
- r= fwrite(vertices,sizeof(Vertices),1,best_f); if (r!=1) diee("fwrite");
+ r= fwrite(vs->a,sizeof(vs->a),1,best_f); if (r!=1) diee("fwrite");
if (fclose(best_f)) diee("fclose new best");
if (rename(output_file_tmp,output_file)) diee("rename install new best");
}
}
-/*---------- use of GSL ----------*/
-
- /* We want to do multidimensional minimisation.
- *
- * We don't think there are any local minima. Or at least, if there
- * are, the local minimum which will be found from the starting
- * state is the one we want.
- *
- * We don't want to try to provide a derivative of the cost
- * function. That's too tedious (and anyway the polynomial
- * approximation to our our cost function sometimes has high degree
- * in the inputs which means the quadratic model implied by most of
- * the gradient descent minimisers is not ideal).
- *
- * This eliminates most of the algorithms. Nelder and Mead's
- * simplex algorithm is still available and we will try that.
- *
- * In our application we are searching for the optimal locations of
- * N actualvertices in D3 (3) dimensions - ie, we are searching for
- * the optimal metapoint in an N*D3-dimensional space.
- *
- * So eg with X=Y=100, the simplex will contain 300 metavertices
- * each of which is an array of 300 doubles for the actualvertex
- * coordinates. Hopefully this won't be too slow ...
- */
-
-static gsl_multimin_fminimizer *minimiser;
-
-static const double stop_epsilon= 1e-6;
-
-static double minfunc_f(const gsl_vector *x, void *params) {
- assert(x->size == DIM);
- assert(x->stride == 1);
- return compute_energy((const double(*)[D3])x->data);
-}
-
-int main(int argc, const char *const *argv) {
- gsl_multimin_function multimin_function;
- double size;
- Vertices initial, step_size;
- FILE *initial_f;
- gsl_vector initial_gsl, step_size_gsl;
- int r, v, k;
-
- if (argc!=3 || argv[1][0]=='-' || strncmp(argv[2],"-o",2))
- { fputs("usage: minimise <input> -o<output\n",stderr); exit(8); }
-
- input_file= argv[1];
- output_file= argv[2]+2;
- if (asprintf(&output_file_tmp,"%s.new",output_file) <= 0) diee("asprintf");
-
- graph_layout_prepare();
- printing_init();
-
- minimiser= gsl_multimin_fminimizer_alloc
- (gsl_multimin_fminimizer_nmsimplex, DIM);
- if (!minimiser) { perror("alloc minimiser"); exit(-1); }
-
- multimin_function.f= minfunc_f;
- multimin_function.n= DIM;
- multimin_function.params= 0;
-
- initial_f= fopen(input_file,"rb"); if (!initial_f) diee("fopen initial");
- errno= 0; r= fread(initial,sizeof(initial),1,initial_f);
- if (r!=1) diee("fread");
- fclose(initial_f);
-
- initial_gsl.size= DIM;
- initial_gsl.stride= 1;
- initial_gsl.block= 0;
- initial_gsl.owner= 0;
- step_size_gsl= initial_gsl;
-
- initial_gsl.data= &initial[0][0];
- step_size_gsl.data= &step_size[0][0];
-
- FOR_VERTEX(v)
- K step_size[v][k]= 0.03;
-//int vx,vy;
-// FOR_RIM_VERTEX(vx,vy,v)
-// step_size[v][3] *= 0.1;
-
- GA( gsl_multimin_fminimizer_set(minimiser, &multimin_function,
- &initial_gsl, &step_size_gsl) );
-
- for (;;) {
- GA( gsl_multimin_fminimizer_iterate(minimiser) );
-
- size= gsl_multimin_fminimizer_size(minimiser);
- r= gsl_multimin_test_size(size, stop_epsilon);
-
- if (printing_check(pr_size))
- printf("%*s size %# e, r=%d\n", 135,"", size, r);
- flushoutput();
-
- if (r==GSL_SUCCESS) break;
- assert(r==GSL_CONTINUE);
- }
- return 0;
-}
-
/*---------- Edgewise vertex displacement ----------*/
/*
}
return cost;
}
-
-/*---------- printing rate limit ----------*/
-
-static volatile unsigned print_todo;
-static sigset_t print_alarmset;
-
-static int printing_check(enum printing_instance which) {
- static int skipped[pr__max];
-
- unsigned bits= 1u << which;
- int sk;
-
- if (!(print_todo & bits)) {
- skipped[which]++;
- return 0;;
- }
-
- sigprocmask(SIG_BLOCK,&print_alarmset,0);
- print_todo &= ~bits;
- sigprocmask(SIG_UNBLOCK,&print_alarmset,0);
-
- sk= skipped[which];
- if (sk) printf("[%4d] ",sk);
- else printf(" ");
- skipped[which]= 0;
-
- return 1;
-}
-
-static void alarmhandler(int ignored) {
- print_todo= ~0u;
-}
-
-static void printing_init(void) {
- struct sigaction sa;
- struct itimerval itv;
-
- sigemptyset(&print_alarmset);
- sigaddset(&print_alarmset,SIGALRM);
-
- sa.sa_handler= alarmhandler;
- sa.sa_mask= print_alarmset;
- sa.sa_flags= SA_RESTART;
- if (sigaction(SIGALRM,&sa,0)) diee("sigaction ALRM");
-
- itv.it_interval.tv_sec= 0;
- itv.it_interval.tv_usec= 200000;
- itv.it_value= itv.it_interval;
-
- if (setitimer(ITIMER_REAL,&itv,0)) diee("setitimer REAL");
-
- raise(SIGALRM);
-}
~ian / moebius2.git / blobdiff