# Fine-tuning Stacked AEs

### From Ufldl

(→General Strategy) |
(→Recap of the Backpropagation Algorithm) |
||

Line 14: | Line 14: | ||

::<math>\begin{align} | ::<math>\begin{align} | ||

\delta^{(n_l)} | \delta^{(n_l)} | ||

- | = - ( | + | = - (\nabla_{a^{nl}J) \bullet f'(z^{(n_l)}) |

\end{align}</math> | \end{align}</math> | ||

: 3. For <math>\textstyle l = n_l-1, n_l-2, n_l-3, \ldots, 2</math> | : 3. For <math>\textstyle l = n_l-1, n_l-2, n_l-3, \ldots, 2</math> |