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pso.js
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pso.js
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const MaxRangeOf_X = 2, MacRangeOf_Y = 3, MacRangeOf_Z = 3;
const MinRangeOf_X =-2, MinRangeOf_Y = -1, MinRangeOf_Z =0;
const FitnessEquation = (x, y, z) => {
return (Math.pow(x, 2) - 2 * x * y * Math.pow(z, 2) + 2 * Math.pow(y, 2) * z - 5.7 * x * y * z + Math.pow(z, 2));
}
function random_number_for_x() {
var random = (Math.random() * 4) - 2;
return random;
}
function random_number_for_y() {
var random = (Math.random() * 4) - 1;
return random;
}
function random_number_for_z() {
var random = (Math.random() * 3);
return random;
}
const is_rangeChecker_X = (val) => {
return (val < MaxRangeOf_X && val > MinRangeOf_X)? true : false
}
const is_rangeChecker_Y = (val) => {
return (val < MacRangeOf_Y && val > MinRangeOf_Y) ? true : false
}
const is_rangeChecker_Z = (val) => {
return (val < MacRangeOf_Z && val > MinRangeOf_Z) ? true : false
}
function r1() {
var random = (Math.random() * 1);
return random;
}
function r2() {
var random = (Math.random() * 1);
return random;
}
const c1 =2, c2 = 2;
const population = (initial_population_size ) => {
let Particles = [];
let personal_best = [];
for (let i = 0; i < initial_population_size; i++) {
Particles[i] = [];
personal_best[i] = [];
for (let j = 0; j < 4; j++) {
switch (j) {
case 0:
Particles[i][j] = random_number_for_x();
personal_best[i][j] = Particles[i][j];
break;
case 1:
Particles[i][j] = random_number_for_y();
personal_best[i][j] = Particles[i][j];
break;
case 2:
Particles[i][j] = random_number_for_z();
personal_best[i][j] = Particles[i][j];
break;
case 3:
Particles[i][j] = FitnessEquation(Particles[i][j-3], Particles[i][j-2], Particles[i][j-1]) // fitness function
personal_best[i][j] = Particles[i][j];
}
}
}
return {init_arr : Particles, personal_best : personal_best}
}
function globalBestAnalyzer (Particles) {
Particles.sort((a, b) => {
if (a[3] === b[3]) {
return 0;
}
else {
return (a[3] < b[3]) ? -1 : 1;
}
})
return Particles[Particles.length - 1];
}
function particle_position(Particles, pers_best, global_best) {
// let arr = Particles;
// //console.log(Particles)
let new_x_value, new_y_value, new_z_value;
for (let i = 0; i < Particles.length; i++) {
var rangeChecker_X = true;
var rangeChecker_Y = true;
var rangeChecker_Z = true;
for (let j = 0; j < 4; j++) {
switch (j) {
case 0: //x
new_x_value = Particles[i][j] + ((c1 * r1()) * (pers_best[i][j] - Particles[i][j])) + ((c2 * r2()) * (global_best[j] - Particles[i][j]))
if(is_rangeChecker_X(new_x_value)){
//console.log("In RANGE", Particles[i][j])
Particles[i][j] = new_x_value;
pers_best[i][j] = Particles[i][j];
}else {
//console.log("x is outside of the range, In else", Particles[i][j])
rangeChecker_X = false;
}
break;
case 1: //y
new_y_value = Particles[i][j] + ((c1 * r1()) * (pers_best[i][j] - Particles[i][j])) + ((c2 * r2()) * (global_best[j] - Particles[i][j]))
if(is_rangeChecker_Y(new_y_value)){
Particles[i][j] = new_y_value;
pers_best[i][j] = Particles[i][j];
}else {
//console.log("y is outside of the range, In else", Particles[i][j])
rangeChecker_Y = false;
}
// Particles[i][j] = Particles[i][j] + ((c1 * r1()) * (pers_best[i][j] - Particles[i][j])) + ((c2 * r2()) * (global_best[j] - Particles[i][j]));
// personal_best[i][j] = Particles[i][j];
break;
case 2: //z
new_z_value = Particles[i][j] + ((c1 * r1()) * (pers_best[i][j] - Particles[i][j])) + ((c2 * r2()) * (global_best[j] - Particles[i][j]))
if(is_rangeChecker_Z(new_z_value)){
Particles[i][j] = new_z_value;
pers_best[i][j] = Particles[i][j];
}else {
//console.log("z is outside of the range, In else", Particles[i][j])
rangeChecker_Z = false;
}
break;
case 3:
if(rangeChecker_X && rangeChecker_Y && rangeChecker_Z)
Particles[i][j] = FitnessEquation(Particles[i][j-3], Particles[i][j-2], Particles[i][j-1]);
pers_best[i][j] = Particles[i][j];
break;
default :
break;
}
}
}
return {individuals : Particles, personal_best : pers_best, global_best : globalBestAnalyzer(pers_best)}
}
number_of_iterations = 150
let initial_population = population(10);
let individuals = initial_population.init_arr;
let personal_best = initial_population.personal_best;
let global_best = globalBestAnalyzer(personal_best);
let HistoryOfAllParticle = []
let particleComplete = {
individuals : individuals,
personal_best : personal_best,
global_best : global_best
};
for (let i = 0; i < number_of_iterations; i++) {
let fitness_arr = []
//console.log(particleComplete.individuals);
for (let j = 0; j < particleComplete.individuals.length; j++) {
fitness_arr[j] = particleComplete.individuals[j][3];
}
HistoryOfAllParticle .push(fitness_arr)
particleComplete = particle_position(particleComplete.individuals, particleComplete.personal_best, particleComplete.global_best);
console.log(particleComplete)
}
console.log(particleComplete.global_best[3])
// //console.log(particle_swarm_optimization(10))