main.c

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/*  lil-gp Genetic Programming System, version 1.0, 11 July 1995
 *  Copyright (C) 1995  Michigan State University
 * 
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of version 2 of the GNU General Public License as
 *  published by the Free Software Foundation.
 * 
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *  
 *  Douglas Zongker       ([e-mail])
 *  Dr. Bill Punch        ([e-mail])
 *
 *  Computer Science Department
 *  A-714 Wells Hall
 *  Michigan State University
 *  East Lansing, Michigan  48824
 *  USA
 *  
 */

#include <lilgp.h>

#ifdef MEMORY_LOG
FILE *mlog;
#endif

/* do we dup OUT_SYS to stdout? */
int quietmode = 0;

/* tree generation spaces. */
genspace gensp[GENSPACE_COUNT];

/* internal copy of function set(s). */
function_set *fset;
int fset_count;

/* information about each tree--which function set it uses,
   its name, size limits, etc. */
treeinfo *tree_map;
int tree_count;

/* maximum number of nodes per individual.  -1 if no limit is
   enforced. */
int ind_nodelimit;

int main ( int argc, char **argv )
{

     multipop *mpop;
     int startgen;
     char *param;
     event start, end, diff;
     event eval, breed;
     int startfromcheckpoint;

#ifdef MEMORY_LOG
     /* dump all memory allocations to a file. */
     mlog = fopen ( "memory.log", "w" );
#endif

     /* mark the start time, and zero the accumulators for evaluation
	and breeding time. */
     event_init();
     event_mark ( &start );
     event_zero ( &eval );
     event_zero ( &breed );

     if ( app_create_output_streams() )
          error ( E_FATAL_ERROR, "app_create_output_streams() failure." );
     initialize_output_streams();

     /* print copyright message and such. */
     initial_message();

     /* some initialization. */
     oprintf ( OUT_SYS, 30, "initialization:\n" );
     initialize_parameters();
     initialize_ephem_const();
     initialize_genspace();

     /* process the command line.  if starting from a checkpoint file, this
	function will load the population. */
     startfromcheckpoint = process_commandline ( argc, argv, &startgen, &mpop );

     /* open the files associated with each stream. */
     open_output_streams();
     
     /* make internal copies of function set(s), if it hasn't already been
	done. */
     if ( !startfromcheckpoint )
	  if ( app_build_function_sets() ) 
	       error ( E_FATAL_ERROR, "app_build_function_sets() failure." );

     /* read parameters limiting tree node count and/or depth. */
     read_tree_limits();

     /* if not starting from a checkpoint, seed the random number generator. */
     if ( !startfromcheckpoint )
	  initialize_random();
     
#if defined(POSIX_MT) || defined(SOLARIS_MT)
     /* setup for multi-threading if applicable */
     initialize_threading();
#endif

     if ( app_initialize ( startfromcheckpoint ) )
          error ( E_FATAL_ERROR, "app_initialize() failure." );

     /* if not starting from a checkpoint, create a random population. */
     if ( !startfromcheckpoint )
          mpop = initial_multi_population();

     /* build the breeding table and the subpop exchange table from
	the parameter database. */
     initialize_topology ( mpop );
     initialize_breeding ( mpop );

     /* do the GP. */
     run_gp ( mpop, startgen, &eval, &breed, startfromcheckpoint );

     /* free app stuff. */
     app_uninitialize();

     /* free lots of stuff. */
     free_breeding ( mpop );
     free_topology ( mpop );
     free_multi_population ( mpop );
     free_parameters();
     free_ephem_const();
     free_genspace();
     free_function_sets();

     /* mark the finish time. */
     event_mark ( &end );
     event_diff ( &diff, &start, &end );

     /* print memory/time statistics and close output files. */
     output_system_stats ( &diff, &eval, &breed );
     close_output_streams();

#ifdef MEMORY_LOG
     fclose ( mlog );
#endif

     /* all done. */
     return 0;
}

/* function_sets_init()
 *
 * this function is called from user code and passed the function sets
 * and tree maps and names.  it makes internal copies and does some
 * validation.
 */

int function_sets_init ( function_set *user_fset, int user_fcount,
                        int *user_tree_map, char **user_tree_name,
                        int user_tcount )
{
     int i, j, k, m, n, p;
     int errors = 0;
     function *cur;

     /* allocate internal copies. */
     fset = (function_set *)MALLOC ( user_fcount * sizeof ( function_set ) );
     tree_map = (treeinfo *)MALLOC ( user_tcount * sizeof ( treeinfo ) );
     fset_count = user_fcount;
     tree_count = user_tcount;

     oprintf ( OUT_SYS, 30, "building function set(s):\n" );

     /* for each set of functions... */
     for ( i = 0; i < fset_count; ++i )
     {
          oprintf ( OUT_SYS, 30, "    set %d:", i );

          /* allocate memory for the set. */
          m = user_fset[i].size;
          fset[i].cset = (function *)MALLOC ( m * sizeof ( function ) );
          fset[i].num_args = 0;
          
          k = 0;
          for ( j = 0; j < m; ++j )
          {
               if ( user_fset[i].cset[j].type == FUNC_DATA ||
                    user_fset[i].cset[j].type == FUNC_EXPR ||
                    user_fset[i].cset[j].type == EVAL_DATA ||
                    user_fset[i].cset[j].type == EVAL_EXPR )
               {
		    /** functions and evaluation tokens **/
		    
                    cur = &(fset[i].cset[k]);
                    
		    /* copy some stuff over. */
                    cur->code = user_fset[i].cset[j].code;
                    cur->ephem_gen = user_fset[i].cset[j].ephem_gen;
                    cur->ephem_str = user_fset[i].cset[j].ephem_str;
                    cur->arity = user_fset[i].cset[j].arity;
                    cur->type = user_fset[i].cset[j].type;
                    cur->evaltree = user_fset[i].cset[j].evaltree;

		    /* copy the name string. */
                    n = strlen ( user_fset[i].cset[j].string );
                    cur->string = (char *)MALLOC ( n+1 );
		    for ( p = 0; p < n; ++p )
		    {
			 if ( isspace(user_fset[i].cset[j].string[p]) ||
			      user_fset[i].cset[j].string[p] == ':' ||
			      user_fset[i].cset[j].string[p] == ')' ||
			      user_fset[i].cset[j].string[p] == '(' ||
			      user_fset[i].cset[j].string[p] == '[' ||
			      user_fset[i].cset[j].string[p] == ']' )
			 {
			      error ( E_WARNING, "illegal character(s) in function name changed to '_'." );
			      cur->string[p] = '_';
			 }
			 else
			      cur->string[p] = user_fset[i].cset[j].string[p];
		    }
                    cur->string[n] = 0;

		    /* fill in the index field with this function's position in the
		       set. */
                    cur->index = k;

		    /* the ERC-related fields should be NULL. */
                    if ( cur->ephem_gen || cur->ephem_str )
                    {
                         ++errors;
                         error ( E_ERROR, "function has non-NULL ephem_gen and/or ephem_str field(s)." );
                    }

		    /* do some type-specific checking. */
                    switch ( cur->type )
                    {
                       case FUNC_DATA:
                       case FUNC_EXPR:
                         if ( cur->code == NULL )
                         {
                              ++errors;
                              error ( E_ERROR, "ordinary function has NULL code field." );
                         }
                         if ( cur->arity < 1 )
                         {
                              ++errors;
                              error ( E_ERROR, "ordinary function has arity of %d.",
                                     cur->arity );
                         }
                         if ( cur->evaltree != -1 )
                         {
                              error ( E_WARNING, "ordinary function has evaltree field of %d; this will be ignored.", cur->evaltree );
                         }
                         break;
                       case EVAL_DATA:
                       case EVAL_EXPR:
                         if ( cur->code != NULL )
                         {
                              ++errors;
                              error ( E_ERROR, "eval function function has non-NULL code field." );
                         }
                         if ( cur->arity != -1 )
                         {
                              error ( E_WARNING, "eval function has arity field of %d; this will be ignored.", cur->arity );
                         }
                         if ( cur->evaltree < 0 ||
                              cur->evaltree >= tree_count )
			      /* evaluation token refers to a tree that doesn't exist. */
                              error ( E_FATAL_ERROR, "eval function refers to nonexistent tree (%d).", cur->evaltree );
                         break;
                       default:
                         ++errors;
                         error ( E_ERROR, "unknown function type %d.", cur->type );
                    }
                    ++k;
               }
               else if ( user_fset[i].cset[j].type == TERM_NORM ||
                        user_fset[i].cset[j].type == TERM_ERC  ||
                        user_fset[i].cset[j].type == TERM_ARG )
               {
		    /** terminals (all kinds). **/

		    /* "cur" is so much easier to type.  :)  */
                    cur = &(fset[i].cset[k]);
                    
		    /* copy stuff. */
                    cur->code = user_fset[i].cset[j].code;
                    cur->ephem_gen = user_fset[i].cset[j].ephem_gen;
                    cur->ephem_str = user_fset[i].cset[j].ephem_str;
                    cur->arity = user_fset[i].cset[j].arity;
                    cur->type = user_fset[i].cset[j].type;
                    cur->evaltree = user_fset[i].cset[j].evaltree;

		    /* copy terminal name. */
                    n = strlen ( user_fset[i].cset[j].string );
                    cur->string = (char *)MALLOC ( n+1 );
                    strcpy ( cur->string, user_fset[i].cset[j].string );
                    cur->string[n] = 0;

		    /* fill in the index field. */
                    cur->index = k;

                    if ( cur->arity != 0 )
                    {
                         ++errors;
                         error ( E_ERROR, "terminal has nonzero arity." );
                    }

		    /* check for correctness of type-dependent fields. */
                    switch ( cur->type )
                    {
                       case TERM_NORM:
                         if ( cur->code == NULL )
                         {
                              ++errors;
                              error ( E_ERROR, "normal terminal has NULL code field." );
                         }
                         if ( cur->ephem_gen != NULL || cur->ephem_str != NULL )
                         {
                              ++errors;
                              error ( E_ERROR, "normal terminal has non-NULL ephem_gen and/or ephem_str field(s)." );
                         }
                         if ( cur->evaltree != -1 )
                         {
                              error ( E_WARNING, "normal terminal has evaltree field of %d; this will be ignored." );
                         }
                         break;
                       case TERM_ERC:
                         if ( cur->code != NULL )
                         {
                              ++errors;
                              error ( E_ERROR, "ERC terminal has non-NULL code field." );
                         }
                         if ( cur->ephem_gen == NULL || cur->ephem_str == NULL )
                         {
                              ++errors;
                              error ( E_ERROR, "ERC terminal has NULL ephem_hen and/or ephem_str field(s)." );
                         }
                         if ( cur->evaltree != -1 )
                         {
                              error ( E_WARNING, "ERC terminal has evaltree field of %d; this will be ignored." );
                         }
                         break;
                       case TERM_ARG:
                         ++fset[i].num_args;
                         if ( cur->code != NULL )
                         {
                              ++errors;
                              error ( E_ERROR, "argument terminal has non-NULL code field." );
                         }
                         if ( cur->ephem_gen != NULL || cur->ephem_str != NULL )
                         {
                              ++errors;
                              error ( E_ERROR, "argument terminal has non-NULL ephem_hen and/or ephem_str field(s)." );
                         }
                         if ( cur->evaltree < 0 )
                         {
                              ++errors;
                              error ( E_ERROR, "argument terminal should have nonnegative evaltree field." );
                         }
                         break;
                    }
                    ++k;
               }
	       oputs ( OUT_SYS, 30, " " );
	       oputs ( OUT_SYS, 30, fset[i].cset[k-1].string );
          }
          fset[i].size = k;
	  oputs ( OUT_SYS, 30, "\n" );
     }

     /* if there were any errors, stop now. */
     if ( errors )
     {
          error ( E_FATAL_ERROR, "error(s) occurred while processing function set(s)." );
     }

     /* build the internal tree map. */
     for ( i = 0; i < tree_count; ++i )
     {
	  /* the function set used for this tree. */
          tree_map[i].fset = user_tree_map[i];
          if ( tree_map[i].fset < 0 || tree_map[i].fset >= fset_count )
               error ( E_FATAL_ERROR, "tree %d uses a nonexistent function set.\n", i );

          oprintf ( OUT_SYS, 30, "    tree %d uses function set %d.\n", i, tree_map[i].fset );

	  /* these will be filled in by read_tree_limits(). */
          tree_map[i].nodelimit = -1;
          tree_map[i].depthlimit = -1;

	  /* copy the tree name. */
          j = strlen ( user_tree_name[i] );
          tree_map[i].name = (char *)MALLOC ( (j+1) * sizeof ( char ) );
          strcpy ( tree_map[i].name, user_tree_name[i] );
     }

     /* now some more processing on each function set. */
     for ( i = 0; i < fset_count; ++i )
     {
          fset[i].function_count = 0;