Exercise $4\mathrm{.}4\mathrm{.}3$ Compute the outgoing vector $\backslash ($ x $\backslash )$ and gradient vector $\backslash (\backslash$delta $\backslash )$ for the network in Figure $4\mathrm{.}21.$ The outgoing signal at each neuron is the sum of the squares of the incoming signals at that neuron. Here the input node signal is the variable $\backslash ($ t $\backslash ),$ so both $\backslash ($ x $\backslash )$ and $\backslash (\backslash$delta $\backslash )$ will have powers of $\backslash ($ t $\backslash )$ in them.

Fig. $4\mathrm{.}21$ Anc $\backslash (\backslash$qquad $\backslash )$