Section 5.6.1 Error

[Hrrsmjd]

In the opening paragraph of section 5.6.1, function $fi(\mathbf{x}{i-1})$ is not a function of $\mathbf{x}_{i-1}$.

[mpd37]

The text reads: $fi(x{i-1}) = \sigma(A{i-1} x{i-1} + b_{i-1})$

and it explicitly mentions $x_{i-1}$?

[Hrrsmjd]

The text reads: fi(xi−1)=σ(Ai−1xi−1+bi−1)

and it explicitly mentions xi−1?

The physical book doesn't mention $x_{i-1}.$

[mpd37]

Got it. Thanks for raising this. It's corrected in the online version, but apparently I forgot to add it to the errata list, which I have done now.