y_real = 0.5                                     // node y_real added to the queue
d = (y_real - y) ** 2                            // node d added to the queue
eta = 0.3                                        // node eta added to the queue
d_z1 = w31 * d                                   // node d_z1 added to the queue
d_z2 = w32 * d                                   // node d_z2 added to the queue
d_x1 = w11 * d_z1 + w12 * d_z2                   // node d_x1 added to the queue
d_x2 = w21 * d_x1 + w22 * d_z2                   // node d_x1 added to the queue
w11 = $w11 - $eta * $d_x1 * (1 - $z1 ** 2) * $x1 // calculating nodes y_real, d, eta, d_z1, d_z2, d_x1, d_x2;
                                                 // clearing queue
                                                 // node w11 added to the queue
w12 = $w12 - $eta * $d_x2 * (1 - $z2 ** 2) * $x2 // calculating node w11
                                                 // clearing queue
                                                 // node w12 added to the queue
w21 = $w21 - $eta * $d_x1 * (1 - $z1 ** 2) * $x1 // ...
w22 = $w22 - $eta * $d_x2 * (1 - $z2 ** 2) * $x2 // ...
w31 = $w31 - $eta * $d_z1 * (1 - $y ** 2) * $z1  // ...
w32 = $w32 - $eta * $d_z2 * (1 - $y ** 2) * $z2  // ...
                                                 // calculating the rest nodes from the queue
                                                 // clearing queue