solver for IQ test

solver.js

const inputLayer = [
  [1, 5],
  [2, 7],
  [3, 9],
  [5, 10],
];

const labels = [
  18,
  27,
  36,
  45,
];


let bias = [0, 0, 0, 0,];

const output = (w, x) => w[0] * (x[0] + x[1]) + w[1] * x[0] + w[2] * x[1] + w[3];
function targetFunction(bias) {
  let error = 0;
  for (let i = 0;i < inputLayer.length;i++) {
    let input = inputLayer[i];
    let b = output(bias, input);
    error += Math.pow(labels[i] - b, 2);
  }
  return error;
}

const n0 = bias.length;
for (let i = 0;i < 100;i++) {
  for (let j = 0;j < n0;j++) {
    let old = bias[j];
    let before = targetFunction(bias);
    bias[j] = old + 0.001;
    let after = targetFunction(bias);
    bias[j] = old + (before - after) * 1;
  }
  if (targetFunction(bias) < 0.0001) {
    break;
  }
  console.log(i, targetFunction(bias));
}
console.log(targetFunction(bias));
console.log(bias);

console.log("4 + 20 = ", output(bias, [4, 20]));