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steady-state_GA.c
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steady-state_GA.c
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/*
* 2012/10/07
* written by tharada
*
* steady-state Genetic Algorithm (steady-state GA)$B$rMQ$$$?(BOne-Max$BLdBj$N2rK!(B
* One-Max$BLdBj(B(One-Max problem)
* $B0dEA;R$NMWAG$G(B1$B$N8D?t$,B?$$$[$II>2ACM$,9b$/$J$kLdBj(B
* $B:GNI2r$O0dEA;R$NA4MWAG$,(B1$B$G$"$k8DBN(B
*/
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define POP_SIZE 100 // $B8DBN?t(B
#define CHROM_LEN 20 // $B0dEA;RD9(B
#define MAX_GENERATION 500 // $B:GBg@$Be?t(B
#define CROSSOVER_RATE 0.5 // $B8r:5N((B
#define MUTATION_RATE (1.0 / CHROM_LEN) // $BFMA3JQ0[N((B
/*
* GA$B$N8DBNMQ$N9=B$BN(B
* Chromsome: $B0dEA;R!"(B0/1$B$N%S%C%HNs(B
* Fitness: $BE,9gEY(B
*/
struct _Individual
{
int Chromsome[CHROM_LEN]; // $B0dEA;R(B
int Fitness; // $BE,9gEY(B
};
typedef struct _Individual Individual;
Individual Population[POP_SIZE]; // $BJl=8CD(B
Individual Children[2]; // $B;R8DBN@8@.MQ(B
/**************************************************/
/* */
/* $BI=<(4X?t(B */
/* */
/**************************************************/
/*
* Population$BG[NsFb$N(Bpop_i$BHVL\$N8DBN$r2<5-$N7A<0$GI=<((B
* xxxxxxxxxx: fitness=yyy
*
* <argument(s)>
* pop_i: $BI=<($9$k8DBN$N%$%s%G%C%/%9(B
*/
void print_chrom(int pop_i)
{
int i;
// $B0dEA;R$NI=<((B
for(i = 0; i < CHROM_LEN; i++){
printf("%d", Population[pop_i].Chromsome[i]);
}
// $BE,9gEY$NI=<((B
printf(": fitness=%d\n", Population[pop_i].Fitness);
}
/*
* $BJl=8CDFb$NA48DBN$rI=<((B
* $BI=<(7A<0$O(Bprint_chrom$B4X?t$K0MB8(B
*/
void print_all(void)
{
int i;
for(i = 0; i < POP_SIZE; i++){
print_chrom(i);
}
}
/**************************************************/
/* */
/* $BI=<(4X?t$*$o$j(B */
/* */
/**************************************************/
/**************************************************/
/* */
/* GA$BK\BN(B */
/* */
/**************************************************/
/*
* Population$BG[NsFb$N(Bpop_i$BHVL\$N8DBN$NE,9gEY$r7W;;(B
* $B:#2s$NLdBj$O0dEA;RFb$N(B1$B$N8D?t$,B?$$$[$INI$$2r$H$9$k$N$G(B
* 1$B$N8D?t$r$=$N$^$^E,9gEY$K$9$k(B
*
* <argument(s)>
* pop_i: $BE,9gEY$r7W;;$9$k8DBN$N%$%s%G%C%/%9(B
*/
void calc_fitness(int pop_i)
{
int sum = 0;
int i;
// $B0dEA;RFb$N(B1$B$N8D?t$r;;=P(B
for(i = 0; i < CHROM_LEN; i++){
if(Population[pop_i].Chromsome[i] == 1){
sum++;
}
}
// 1$B$N8D?t$,$=$N$^$^8DBN$NE,9gEY(B
Population[pop_i].Fitness = sum;
}
/*
* $BJl=8CDFb$NA48DBN$NE,9gEY$r7W;;(B
*/
void calc_fit_all(void)
{
int i;
for(i = 0; i < POP_SIZE; i++){
calc_fitness(i);
}
}
/*
* $BJl=8CD$rE,9gEY$G%=!<%F%#%s%0(B
*/
void sort_population(void)
{
int i, j;
Individual tmp1, tmp2;
for(i = 0; i < POP_SIZE - 1; i++){
for(j = i; j < POP_SIZE; j++){
tmp1 = Population[i];
tmp2 = Population[j];
if(tmp1.Fitness < tmp2.Fitness){
Population[i] = tmp2;
Population[j] = tmp1;
}
}
}
}
/*
* $BJl=8CD$r%i%s%@%`$K=i4|2=(B
*/
void init_chrom(void)
{
int i, j;
for(i = 0; i < POP_SIZE; i++){
for(j = 0; j < CHROM_LEN; j++){
// $B0dEA;R$N3FMWAG$r(B0/1$B$G%i%s%@%`$K=i4|2=(B
Population[i].Chromsome[j] = rand() % 2;
}
calc_fitness(i);
}
}
/*
* $BJl=8CD$NCf$+$i?F$H$J$k8DBN$rA*Br(B
* $B:#2s$O%H!<%J%a%s%HA*Br$r;HMQ(B
*
* $B%H!<%J%a%s%HA*Br(B(tournament selection)
* $BJl=8CD$NCf$+$i%i%s%@%`$K(Bn$B8DBNA*Br$7!"$=$NCf$G:G$bI>2A$N9b$$8DBN$rA*Br(B
* n$B$r%H!<%J%a%s%H%5%$%:$H8F$V(B
* $B:#2s$O%H!<%J%a%s%H%5%$%:$O(Bn=2
*
* <return>
* $BA*Br$7$?8DBN$N%$%s%G%C%/%9(B
*/
int select_chrom(void)
{
int i1, i2;
int ret;
// $B%i%s%@%`$K(B1$B8DBNA*Br(B
i1 = rand() % POP_SIZE;
// $B$b$&(B1$B8DBN$rHo$i$J$$$h$&$KA*Br(B
do{
i2 = rand() % POP_SIZE;
} while(i1 == i2);
// $BE,9gEY$rHf3S$7!"I>2A$N9b$$8DBN$rLa$jCM$H$7$FA*Br(B
if(Population[i1].Fitness >= Population[i2].Fitness){
ret = i1;
}
else{
ret = i2;
}
return ret;
}
/*
* $BJl=8CD$NCf$+$i(B2$B8DBN$rA*Br$7(BChildren$BG[Ns$KJ]B8(B
*/
void generate_children(void)
{
int c1, c2;
// $B%H!<%J%a%s%HA*Br(B
c1 = select_chrom();
c2 = select_chrom();
// $BA*Br$7$?8DBN$r(BChildren$BG[Ns$KJ]B8(B
Children[0] = Population[c1];
Children[1] = Population[c2];
}
/*
* 2$B$D$N;R8DBN$KBP$7$F8r:5N((B(CROSSOVER_RATE)$B$K$b$H$E$$$F8r:5$r<B9T(B
* $B:#2s$O(B2$B$D$N8DBN$r(B1$B$D$N%i%s%@%`$J4p=`E@(B($B8r:5E@!'(Bcrossover_point)$B$GF~$lBX$($k0lE@8r:5$r;HMQ(B
*
* $B0lE@8r:5$NNc!J8r:5E@$O(B7$BHVL\!K(B
* =======|=== -> =======|###
* #######|### -> #######|===
*/
void crossover(void)
{
int i;
int crossover_point;
int tmp;
double r;
r = (double)rand() / ((double)RAND_MAX + 1); // [0,1)$B$NMp?t(B
// $B8r:5N($K4p$E$$$F8r:5$r<B9T(B
if(r < CROSSOVER_RATE){
// $B8r:5E@$r%i%s%@%`$K7hDj(B
crossover_point = rand() % CHROM_LEN;
// $B8r:5E@$h$j8e$m$rF~$lBX$($k(B
for(i = crossover_point; i < CHROM_LEN; i++){
tmp = Children[0].Chromsome[i];
Children[0].Chromsome[i] = Children[1].Chromsome[i];
Children[1].Chromsome[i] = tmp;
}
}
}
/*
* 2$B$D$N;R8DBN$KBP$7$FFMA3JQ0[N(!J:#2s$O(B1/$B0dEA;RD9!K$K4p$E$$$FFMA3JQ0[$r<B9T(B
* $BFMA3JQ0[$O0dEA;R$N%S%C%HCM$rH?E>(B(0->1, 1->0)
*/
void mutation(void)
{
int i;
double r;
for(i = 0; i < CHROM_LEN; i++){
// Children[0]$B$KBP$9$kFMA3JQ0[(B
r = (double)rand() / ((double)RAND_MAX + 1); // [0,1)$B$NMp?t(B
// $BFMA3JQ0[N($K4p$E$$$FFMA3JQ0[$r<B9T(B
if(r < MUTATION_RATE){
// $B%S%C%HCM$rH?E>(B
if(Children[0].Chromsome[i] == 0){
Children[0].Chromsome[i] = 1;
}
else{
Children[0].Chromsome[i] = 0;
}
}
// Children[0]$B$KBP$9$kFMA3JQ0[(B
r = (double)rand() / ((double)RAND_MAX + 1); // [0,1)$B$NMp?t(B
// $BFMA3JQ0[N($K4p$E$$$FFMA3JQ0[$r<B9T(B
if(r < MUTATION_RATE){
// $B%S%C%HCM$rH?E>(B
if(Children[1].Chromsome[i] == 0){
Children[1].Chromsome[i] = 1;
}
else{
Children[1].Chromsome[i] = 0;
}
}
}
}
/*
* $B@8@.$7$?(B2$B8DBN$rJl=8CD$NCf$GE,9gEY$N0-$$(B2$B8DBN$rF~$lBX$((B
* $B$3$N;~!"(BPopulation$BG[Ns$OE,9gEY$G%=!<%H$5$l$F$$$k$b$N$H$9$k(B
*/
void swap_population(void)
{
Population[POP_SIZE - 1] = Children[0];
calc_fitness(POP_SIZE - 1);
Population[POP_SIZE - 2] = Children[1];
calc_fitness(POP_SIZE - 2);
}
/*
* GA$B$N<B9T%5%$%/%k(B
*
* $B<B9T=g$O(B
* 1. $B=i4|8DBN@8@.(B(init_chrom)
* 2. $BE,9gEY$G%=!<%F%#%s%0(B(sort_population)
* 3. $B;R8DBN$r(B2$B$DA*Br(B(generate_children)
* 4. $B8r:5(B(crossover)
* 5. $BFMA3JQ0[(B(mutation)
* 6. $B;R8DBN$rE,9gEY$N0-$$8DBN$HF~$lBX$((B(swap_population)
* 7. 2~6$B$r7+$jJV$9(B
*/
void GA(void)
{
int gen = 0;
// 1. $B=i4|8DBN@8@.(B(init_chrom)
init_chrom();
while(gen < MAX_GENERATION)
{
// 2. $BE,9gEY$G%=!<%F%#%s%0(B(sort_population)
sort_population();
printf("%d gen\r\n", gen);
print_chrom(0); // $B:GNI8DBN$rI=<((B
// 3. $B;R8DBN$r(B2$B$DA*Br(B(generate_children)
generate_children();
// 4. $B8r:5(B(crossover)
crossover();
// 5. $BFMA3JQ0[(B(mutation)
mutation();
// 6. $B;R8DBN$rE,9gEY$N0-$$8DBN$HF~$lBX$((B(swap_population)
swap_population();
gen++;
}
sort_population();
printf("%d gen\r\n", gen);
print_chrom(0); // $B:G=*@$Be$N:GNI8DBN$rI=<((B
}
/**************************************************/
/* */
/* GA$BK\BN$*$o$j(B */
/* */
/**************************************************/
/**************************************************/
/* */
/* main */
/* */
/**************************************************/
int main(int argc, char **argv)
{
srand((unsigned int)time(NULL)); // $BMp?t=i4|2=(B
GA();
return 0;
}
/**************************************************/
/* */
/* main$B$*$o$j(B */
/* */
/**************************************************/