code: function regularizeNone(weights, gradientCount) {
    const [gradient, count] = gradientCount;
  
    for (let i = 0; i < gradient.length; i++) {
      let grad = (gradient[i] || 0) / count;
      weights[i] = (weights[i] || 0) - grad;
    }
  }
docs: None, a.k.a ordinary least squares