w
i
j
(
ℓ
)
(
t
+
1
)
=
w
i
j
(
ℓ
)
(
t
)
−
α
∂
E
∂
w
i
j
(
ℓ
)
(
t
)
w_{ij}^{(\ell)}(t+1) = w_{ij}^{(\ell)}(t) - \alpha \; \frac{\partial E}{\partial w_{ij}^{(\ell)}(t)}
w
i
j
(
ℓ
)
(
t
+
1
)
=
w
i
j
(
ℓ
)
(
t
)
−
α
∂
w
i
j
(
ℓ
)
(
t
)
∂
E