$h_d=a[{}_{d0}+{\displaystyle \underset{i=1}{\overset{D_i}{}}}{}_{di}{x}_i]$

$y_j={}_{j0}+{\displaystyle \underset{d=1}{\overset{D}{}}}{}_{jd}{h}_d$

Problem $3\mathrm{.}17*$ Equations $3\mathrm{.}11$ and $3\mathrm{.}12$ define a general neural network with $D_i$ inputs, one

hidden layer containing $D$ hidden units, and $D_o$ outputs. Find an expression for the number of

parameters in the model in terms of $D_i,D,$ and $D_o.$