gallagers.c

快速傅立叶变换程序代码,学信号的同学,可要注意了

/*
   gallagerS.c 
   gallager.c
   mncN.c
   mnc6.c                                    (c) DJCM 94 07 04
                                                      94 10 26
						      94 10 31
						      95 01 02
						      95 02 23 (from mnc2 to mnc3)
						      95 04 01 continued work on mnc3
						      95 05 01 to mnc4
						      95 05 27 to mnc5
						      95 08 31 to mnc6
						      95 11 04 to mnc7
						      95 11 16 to mncN
						      97 07 23 added noise-writing
                                                      98 10 12 to gallager
						      98 11 19 added bsc option again

   - GallagerS restores some capabilities that were removed at mncN,
         namely we allow the use of state bits (like MN source bits) again.
	 They must be consecutive bits.
   - gallager writes files rationally like RA.c
      added features: spotting of low weight errors
      and logging of det/undet and histograms.
      So that the output file becomes unnecessary.

   - mncN = quick hack to do all bits as if they are noise bits.

   - free energy minimization for the MacKay-Neal Error Correcting Code - 
   - or belief net decoder                                              -
   - mnc7 includes option of gaussian channel                           -

   - space is made for the fe min or for the bnd, then the scoring 
     routine gets to look at the results via pointers in the mnc_vector
     structure. Thus scoring is divorced from fe. 

     crucial var files: both fe_var6 and dc_var6

   ======================================================================

   This code is (c) David J.C. MacKay 1994, 1995. It is free software 
   as defined by the free software foundation. 

   What this program does: 

     reads in a matrix A in alist format.
     do {
       generates a  random vector x, 
       shoves it through A, adds y if appropriate, -> z = Ax + y
       do {
         gives b, g (z) to the minimization machine, or A,z to the bnd
         checks the answer. 
	 next strategy
       }
       until ( success OR no more strategies )
     }
     while ( not many failures )

*/

#include "./ansi/r.h"
#include "./ansi/rand2.h"
#include "./ansi/mynr.h"
#include "./ansi/cmatrix.h"
#include "./ansi/macopt.h"
#include "./thing_sort.h"
#include "./fe6.h"
#include "./bnd.h"
/* this must come last:
 data_creation_param is defined where? */
#include "./mnc6.h"

/* static void totalline ( FILE * , mnc_all * , data_creation_param * ); */
static void dc_defaults ( data_creation_param * ) ; 
static int    process_command ( int , char **  , mnc_all * ) ; 
static void   print_usage ( char ** , FILE * ,  mnc_all *  );
static void   fe_print_usage ( char ** , FILE * ,  mnc_all *  );
static int make_sense ( data_creation_param * , mnc_all * ) ; 
static int make_sense_c ( data_creation_param * , fe_min_control * ) ; 
static int make_space ( mnc_all * , mnc_vectors * ) ;
static int make_norder ( alist_matrix * , fe_min_control * ) ;
static int make_vectors_quick ( data_creation_param * , mnc_vectors * ,  mnc_all * ) ;
static int make_vectors_quickER ( data_creation_param * , mnc_vectors * ,  mnc_all * ) ;
static void process_vector_fe ( mnc_vectors *v , fe_min_param *p ) ;
static int make_fgaussian_noise_bits_and_fix_biases ( unsigned char * ,
						    double *,double *,
						    double  , double , 
						    double  , int , int  ) ;
static int make_gaussian_noise_bits_and_fix_biases ( unsigned char * ,
						    double *,
						    double  ,
						    int , int  ) ;
static int make_gaussian_noise_bits_ONLY ( unsigned char * ,
						    double *,
						    double  ,
						    int , int  ) ;
static void set_up_biases ( double * , mnc_vectors * , data_creation_param * ) ; 
static void set_up_priors ( double * , mnc_vectors * , data_creation_param * ) ; 
static int score ( data_creation_param * , mnc_vectors  * , mnc_all * ) ; 
static int evaluate_feasibility ( data_creation_param * ) ;

static double bern ( int  , int  , double * , double * ,  double * , double );
static void write_histo ( FILE * , mnc_all * ) ;
static void snappyline ( data_creation_param * ) ;
static void   finalline (  FILE * , mnc_all * , data_creation_param * , int ) ;

static void mnc_free ( mnc_all * ) ; 
static int check_alist_MN ( alist_matrix * , mnc_vectors *vec , data_creation_param * ) ; 
static int hook_mnc_vec_to_bnd ( bnd_param *p , mnc_vectors *vec ) ;
static int hook_mnc_vec_to_fe ( fe_min_param *p , mnc_vectors *vec ) ;
static void bnd_print_usage ( char **argv , FILE * fp , mnc_all *all );
static double h2 ( double ) ;

void   main ( int , char ** ) ;

/*
        MAIN
                     */
void main ( int argc, char *argv[] )
{
  FILE   *fp  ; 

  fe_min_param        p    ;
  fe_min_control      c    ;
  fe_min_control      c2   ; /* backup strategy */
  fe_min_control      c3   ; /* backup strategy */
  bnd_control         bndc ; 
  bnd_param           bndp ;
  data_creation_param dc   ;
  mnc_vectors         vec  ; 
  mnc_all             all  ;

  all.dc   = &dc ; 
  all.p    = &p ; 
  all.c    = &c ; 
  all.bndp = &bndp ; 
  all.bndc = &bndc ; 
  all.c2   = &c2 ; 
  all.c3   = &c3 ; 
  all.vec  = &vec ; 
  all.a    = &(p.a) ; 
  bndp.a   = &(p.a) ; 

  fe_defaults_p ( &p ) ; 
  fe_defaults_c ( &c ) ; 
  fe_defaults_c ( &c2 ) ; 
  fe_defaults_c ( &c3 ) ; 
  dc_defaults   ( &dc ) ; 
  bnd_defaults  ( &bndp , & bndc ) ; 

  if ( process_command (argc, argv, &all ) < 0 ) exit (0) ;
  if ( make_sense ( &dc , &all ) < 0 ) exit (0) ;

  fprintf(stderr,"mncN N0=%d, M0=%d, N=%d, M=%d, x=%6.3g, fn=%6.3g, fs=%6.3g, nn=%d, ns=%d\n",
	  dc.N , dc.M , vec.N , vec.M , dc.gcx , dc.fn , dc.fs , dc.nn , dc.ns) ;
  fflush(stderr);
  if ( dc.use_fe && c.second ) {
    fprintf(stdout,"opt=%2d:%2d:%2d ",
	     c.opt , c.gamma , c.metric ) ;
    fprintf(stdout,"opt2=%2d:%2d:%2d ",
	     c2.opt , c2.gamma , c2.metric ) ;
    fprintf(stdout,"opt3=%2d:%2d:%2d ",
	     c3.opt , c3.gamma , c3.metric ) ;
  }

  if ( make_space ( &all , &vec ) < 0 ) exit (0) ;

  if ( read_allocate_alist ( &(p.a) , dc.afile ) < 0 ) exit (0) ; 
  if ( check_alist_MN ( &(p.a) , &vec , &dc ) < 0 ) exit (0) ; 

  if ( dc.use_fe >= 1 ) {
    c.mega_needed = ( c.opt == 3 || 
		   ( c.second && c2.opt == 3 ) || 
		   ( c.third && c3.opt == 3 ) ) ;
    hook_mnc_vec_to_fe (  &p ,  &vec ) ;
    fe_allocate2 ( &p , c.mega_needed ) ; 
    set_up_biases ( p.bias , &vec , &dc ) ; 
    if ( make_norder ( &(p.a) , &c ) < 0 ) exit ( 0 ) ; 
  }
  if ( dc.use_bnd >= 1 ) {
    hook_mnc_vec_to_bnd (  &bndp ,  &vec ) ;
    bnd_allocate ( &bndp , &bndc ) ; 
    set_up_priors ( bndp.bias , &vec , &dc ) ; 
  }

  if ( evaluate_feasibility ( &dc ) < 0 ) exit ( 0 ) ; 

  if ( c.writelog ) {
    fp = fopen ( c.logfile , "w" ) ;
    if ( !fp ) {
      fprintf ( stderr , " couldn't open logfile %s\n" , c.logfile ) ; 
      c.writelog = 0 ; 
    } else fclose (fp ) ; 
  }

  if ( bndc.writelog ) {
    fp = fopen ( bndc.logfile , "w" ) ;
    if ( !fp ) {
      fprintf ( stderr , " couldn't open logfile %s\n" , bndc.logfile ) ; 
      bndc.writelog = 0 ; 
    } else fclose (fp ) ; 
  }

  if ( dc.error_log ) {
    fp = fopen ( dc.error_logfile , "w" ) ;
    if ( !fp ) {
      fprintf ( stderr , " couldn't open logfile %s\n" , dc.error_logfile ) ; 
      dc.error_log = 0 ; 
    } else fclose (fp ) ; 
  }
  if ( dc.noise_sum ) {
    fp = fopen ( dc.noise_sumfile , "w" ) ;
    if ( !fp ) {
      fprintf ( stderr , " couldn't open logfile %s\n" , dc.noise_sumfile ) ; 
      dc.noise_sum = 0 ; 
    } else fclose (fp ) ; 
  }

  /*
      MAIN LOOP
                 */
  ran_seed ( dc.vseed ) ; 
  dc.message = 1 ;
  if ( dc.skip ) {
    fprintf ( stderr , "skipping %d", dc.skip ) ; 
    for (  ; dc.message <= dc.skip ; dc.message ++ ) {
      make_vectors_quickER ( &dc , &vec , &all ) ; 
      if ( !(dc.message % 200) ) { fprintf ( stderr , "." ) ; fflush ( stderr ) ; }
    }fprintf ( stderr , "\n" ) ; 
  }
  for ( ;       ( dc.message <= dc.MESSAGE ) && 
       ( ( dc.failures==0 ) || ( dc.failcount < dc.failures ) ) ; 
       dc.message ++ ) {

    snappyline( &dc ) ;
    fflush(stdout) ; 
    make_vectors_quick ( &dc , &vec , &all ) ; /* see this file */

    if ( dc.use_fe >=1 ) {
      process_vector_fe ( &vec , &p ) ; 
      all.controller = 1 ; 
      if ( ( fe_min ( &p , &c ) > 0 ) && ( c.second ) ) {
	all.controller ++ ;
	if ( ( fe_min ( &p , &c2 ) > 0 ) && ( c.third ) ) { 
	  all.controller ++ ;
	  fe_min (  &p , &c3 ) ; 
	}
      }
    } else {
      all.controller = 0 ; 
      bndecode ( &bndp , &bndc ) ;
    }
    if ( score ( &dc , &vec , &all ) < 0 ) exit ( 0 ) ; /* score also writes error logs and keeps track of nasty noise patterns */

    if ( dc.verbose > 0 ) finalline ( stdout , &all , &dc , 0 ) ;

    if ( c.printout ) { /* append */
      fp = fopen ( c.outfile , ((c.outappend)? "a":"w") ) ;
      if( !fp ) {
	fprintf( stderr, "No such file: %s\n", c.outfile ) ;
	finalline ( stderr , &all , &dc , 0 ) ;
      }      else 	{
	finalline ( fp , &all , &dc , 0 ) ;
	fclose ( fp ) ;
      }
    }
    /* if this is going to be the last loop, or the number of messages is 30,60,... */
    if ( ( !( ( dc.message+1 <= dc.MESSAGE ) && 
	    ( ( dc.failures==0 ) || ( dc.failcount < dc.failures ) ) ) )  
	 || ( !(dc.message % dc.big_write_period ) ) ) {
      if ( c.printtot ) { /* write */
	fp = fopen ( c.totoutfile , "w" ) ;
	if( !fp ) {
	  fprintf( stderr, "No such file: %s\n", c.totoutfile ) ;
	  finalline ( stderr , &all , &dc ,  1 ) ;
	}      else 	{
	  finalline ( fp , &all , &dc , 1 ) ;
	  fclose ( fp ) ;
	}
      }
      if ( c.printhisto && dc.block_valid ) { /* update histogram file */
	fp = fopen ( c.histofile , "w" ) ;
	if( !fp ) {
	  fprintf( stderr, "No such file: %s\n", c.histofile ) ;
	}      else 	{
	  write_histo ( fp , &all ) ;
	  fclose ( fp ) ;
	}
      }
    }
  }

  if ( dc.use_fe >= 1 ) {
    fe_free2 ( &p , c.mega_needed ) ; 
  }
  if ( dc.use_bnd >= 1 ) {
    bnd_free ( &bndp , &bndc ) ;
  }
  mnc_free ( &all ) ; 

}

static void write_histo ( FILE *fp , mnc_all *c ) {
  int l;
  double t , cum = 0.0 ;
  double  tot = (double) c->dc->block_valid ; 
  int *histo = c->vec->histo ; 
  int loops = c->bndc->loops ;

  fprintf ( fp , "# total valid blocks %d\n" , (int) tot ) ; 
  for ( l = 1 ; l <= loops ; l ++ ) {
    t= (double) histo[l] ;
    cum += t ;
    fprintf ( fp , "%d\t%d\t%d\t%9.4g\t%9.4g\n" , l , (int)(t) , (int)(cum) , 
	      t/tot , cum/tot ) ; 
  }

}
static void snappyline ( data_creation_param  *c ) {
  printf ( "%d:%du%dd%dl/%d\t" , c->failcount ,
	   c->block_undet, c->block_det,
	   c->block_detlw , c->message - 1 ) ;
 fflush ( stdout ) ; 
}

static double bern ( int errors , int trials , double *p_point , double *p_upper
		   ,  double *p_lower , double zscore ) {
  double factor ; double lowerbound = 1e-6 ;
  if ( errors == 0  ) {
    *p_point = lowerbound ;
    *p_lower = lowerbound ;
    *p_upper = 1.0 - exp( - zscore / (double)(trials) ) ; 
    factor = 100.0 ; 
  } else {
    *p_point =  (double)(errors)/(double)(trials) ;
    /* factor corresponding z sd's in log p */
    factor = exp ( zscore * sqrt( (double)(trials - errors ) / ((double)(errors * trials ) ) )) ;
    *p_upper = *p_point * factor ; 
    *p_lower = *p_point / factor ; 
  }
  return factor ;
}

static void finalline ( FILE *fp , mnc_all *all , data_creation_param *dc , int totals )
{
  mnc_vectors *v = all->vec ;
  fe_min_control *c = all->c ; 
  double factor ; 

  /* this may need updating since the restoration of state variables */
  if ( totals ) {
    factor = bern ( dc->failcount , dc->blocks , &(dc->bep) , 
		    &(dc->bep_u) , &(dc->bep_l) , dc->zscore  ) ;
    dc->bitep = (double) dc->bit_errs / (double)(v->N * dc->blocks ) ;
    dc->bitep_u = dc->bitep * factor ; 
    dc->bitep_l = dc->bitep / factor ; 
    dc->bep_det   = (double) dc->block_det /  (double)( dc->blocks ) ;
    dc->bep_detlw   = (double) dc->block_detlw /  (double)( dc->blocks ) ;
    dc->bep_undet = (double) dc->block_undet /  (double)( dc->blocks ) ;
  }

  if ( (!(c->outappend)) || (totals)  ||
       ( dc->pheading_period && 
	 ! ( ( ++ dc->pheading_count ) % dc->pheading_period ))  ) {
    if ( !totals ) {
      fprintf ( fp , "#es  viols t_es ") ; 
    }
    fprintf ( fp , "#blks es un det valid " ) ; 
    fprintf ( fp , "Eb/No(dB)    x    xass ") ; 
    if ( !totals ) {
      fprintf ( fp , "   xact flipd ") ; 
    }
    if ( totals ) {
      fprintf ( fp , "  K    N ") ; 
      fprintf ( fp , "biters undet det ") ; 
      fprintf ( fp , "block_ep u     l    ") ;