Accord.Math.Optimization.LevenbergMarquardt.computeErrors C# (CSharp) Method

        private double computeErrors(double[][] input, double[] output, int[] block)
        {
            double sumOfSquaredErrors = 0.0;

            // for each input sample
            foreach (int i in block)
            {
                double actual = Function(solution, input[i]);
                double expected = output[i];

                double e = expected - actual;
                sumOfSquaredErrors += e * e;

                errors[i] = e;
            }

            return sumOfSquaredErrors / 2.0;
        }