Method update

src/nn.rs:182–189

(&self, acc: &mut Vec<Matrix<f64>>, deltas: &Vec<Vec<f64>>, a: &Vec<Vec<f64>>)

    }

    fn update(&self, acc: &mut Vec<Matrix<f64>>, deltas: &Vec<Vec<f64>>, a: &Vec<Vec<f64>>) {

        let mut dp = deltas.len();
        for i in (0..acc.len()) {
            dp -= 1;
            acc[i].iadd(&deltas[dp].col_mul_row(&a[i]));
        }
    }

    pub fn derivatives(&self, examples: &Matrix<f64>, targets: &Matrix<f64>) -> Vec<Matrix<f64>> {