我有一些机器学习方面的问题。在第一代之后，火箭不再变异，而是沿着相同的路径前进。如您所见，我尝试了不同的方法来解决该问题，但是它们都不起作用。我在openprocessing.org中编写了此文件，但也尝试在本地进行。我没有看到问题，但我认为这是在Rocket构造函数中。
var rockets = [];
var bf = -1;
var br;
function setup() {
createCanvas(windowWidth, windowHeight);
background(100);
noStroke();
fill(255, 50);
frameRate(10);
target = createVector(width, height / 2);
for (var i = 0; i < 10; i++) {
rockets.push(new Rocket());
}
}
function draw() {
background(100);
ellipse(width / 2, height / 2, 40, 40);
ellipse(width - 10, height / 2, 40, 40);
for (i = 0; i < rockets.length; i++) {
rockets[i].show();
//console.log(rockets[i].pos.y);
if (!rockets[i].killed) {
rockets[i].applyForce(); //it is a fittness counter inside
}
}
//console.log(rockets);
if (rockets[0].counter >= rockets[0].route.length) {
findBest();
respawn();
}
}
function respawn() {
var news = mutate(br);
for (var i = 0; i < 10; i++) {
rockets.push(new Rocket());
//console.log(rockets);
rockets[i].route = news[i];
}
}
function findBest() {
for (var i = 0; i < rockets.length; i++) {
//console.log(rockets[i].fittness);
if (rockets[i].fittness > bf) {
br = rockets[i].route;
bf = rockets[i].fittness;
}
}
rockets = [];
}
function mutate(arr) {
var news = [];
for (var i = 0; i < 10; i++) {
var tempArr = arr;
tempArr[floor(random(arr.lenth))] = p5.Vector.random2D().setMag(30);
news.push(tempArr);
}
return news;
}
function Rocket(a) {
this.pos = createVector(width / 2, height / 2);
this.route = [];
this.counter = 0;
this.fittness = 0;
this.killed = false;
//console.log(a);
if (!a) {
for (var i = 0; i < 20; i++) {
this.route.push(p5.Vector.random2D());
this.route[i].setMag(20);
//console.log("!A");
// console.log(i);
}
} else {
// this is not used
this.route = a;
// for(var i = floor(random(a.length-1)); i<a.length; i++) {
//console.log(this.route[i]);
b = floor(random(this.route.length - 1));
console.log("before: ", this.route[b]);
this.route[b] = p5.Vector.random2D().setMag(30);
//this.route[i].rotate(0.2*pow(-1, i));
console.log("after: ", this.route[b]);
//}
}
//console.log(mutate(this.route));
this.applyForce = function() {
if (this.counter == this.route.length - 1) {
this.countFittness();
//console.log(this.fittness);
this.killed = true;
}
this.pos.add(this.route[this.counter]);
this.counter++;
}
this.countFittness = function() {
this.fittness = 1 / this.pos.dist(target) * 100;
//console.log(this.fittness);
}
this.show = function() {
ellipse(this.pos.x, this.pos.y, 10, 10);
}
}<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.5.12/p5.js"></script>
</head>
</html>最佳答案
好的代码。您的mutate函数似乎有一个错误：
function mutate(arr) {
var news = [];
for (var i = 0; i < 10; i++) {
var tempArr = arr;
tempArr[floor(random(arr.length))] = p5.Vector.random2D().setMag(30);
news.push(tempArr);
}
return news;
}
使用时
var tempArr = arr;
在javascript中，您不会获得数组的副本。两个数组将指向相同的引用。当您变异一个时，原始物也会变异。这样，最终所有的火箭路线都将是相同的。
尝试...
var tempArr = arr.slice();
slice（）操作将克隆数组并返回对新数组的引用。
同一功能中也有一个小的错字。我认为应该是...
tempArr[floor(random(arr.length))] = p5.Vector.random2D().setMag(30);
关于javascript - 火箭在突变后没有改变方向，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45751718/