/*
* random_init_pool
* initialize genetic pool
*/
void
random_init_pool(planner_info_n *root, Pool *pool)
{
Chromosome* chromo = (Chromosome *) pool->data;
int i;
for (i = 0; i < pool->size; i++) {
init_tour(root, chromo[i].string, pool->string_length);
pool->data[i].worth = geqo_eval(root, chromo[i].string, pool->string_length);
}
}
/*
* random_init_pool
* initialize genetic pool
*/
void
random_init_pool(PlannerInfo *root, Pool *pool)
{
Chromosome *chromo = (Chromosome *) pool->data;
int i;
int bad = 0;
/*
* We immediately discard any invalid individuals (those that geqo_eval
* returns DBL_MAX for), thereby not wasting pool space on them.
*
* If we fail to make any valid individuals after 10000 tries, give up;
* this probably means something is broken, and we shouldn't just let
* ourselves get stuck in an infinite loop.
*/
i = 0;
while (i < pool->size)
{
init_tour(root, chromo[i].string, pool->string_length);
pool->data[i].worth = geqo_eval(root, chromo[i].string,
pool->string_length);
if (pool->data[i].worth < DBL_MAX)
i++;
else
{
bad++;
if (i == 0 && bad >= 10000)
elog(ERROR, "geqo failed to make a valid plan");
}
}
#ifdef GEQO_DEBUG
if (bad > 0)
elog(DEBUG1, "%d invalid tours found while selecting %d pool entries",
bad, pool->size);
#endif
}