I have the following code to draw a Neural Network, which produces the image below
\documentclass[border=3pt,tikz]{standalone}
\usepackage{amsmath} % for aligned
%\usepackage{amssymb} % for \mathbb
\usepackage{tikz}
%\usepackage{etoolbox} % for \ifthen
\usepackage{listofitems} % for \readlist to create arrays
\usetikzlibrary{arrows.meta} % for arrow size
\usepackage[outline]{contour} % glow around text
\contourlength{1.4pt}
\tikzset{>=latex} % for LaTeX arrow head
\usepackage{xcolor}
\colorlet{myred}{red!80!black}
\colorlet{myblue}{blue!80!black}
\colorlet{mygreen}{green!60!black}
\colorlet{myorange}{orange!70!red!60!black}
\colorlet{mydarkred}{red!30!black}
\colorlet{mydarkblue}{blue!40!black}
\colorlet{mydarkgreen}{green!30!black}
\tikzstyle{node}=[thick,circle,draw=myblue,minimum size=22,inner sep=0.5,outer sep=0.6]
\tikzstyle{node in}=[node,green!20!black,draw=mygreen!30!black,fill=mygreen!25]
\tikzstyle{node hidden}=[node,blue!20!black,draw=myblue!30!black,fill=myblue!20]
\tikzstyle{node convol}=[node,orange!20!black,draw=myorange!30!black,fill=myorange!20]
\tikzstyle{node out}=[node,red!20!black,draw=myred!30!black,fill=myred!20]
\tikzstyle{connect}=[thick,mydarkblue] %,line cap=round
\tikzstyle{connect arrow}=[-{Latex[length=4,width=3.5]},thick,mydarkblue,shorten <=0.5,shorten >=1]
\tikzset{ % node styles, numbered for easy mapping with \nstyle
node 1/.style={node in},
node 2/.style={node hidden},
node 3/.style={node out},
}
\def\nstyle{int(\lay<\Nnodlen?min(2,\lay):3)} % map layer number onto 1, 2, or 3
\begin{document}
% NEURAL NETWORK with coefficients, shifted
\begin{tikzpicture}[x=2.2cm,y=1.4cm]
\message{^^JNeural network, shifted}
\readlist\Nnod{4,5,3} % array of number of nodes per layer
\readlist\Nstr{q,m,J} % array of string number of nodes per layer
%\readlist\Cstr{\strut Z_{\index},w_{\index}^{(\prev)},g_{n,\index}^{}}
\readlist\Cstr{\strut \boldsymbol{Z }{\index},w{\index}^{(\prev)},\boldsymbol{g}_{\index}^{}}
\def\yshift{0.5} % shift last node for dots
\message{^^J Layer}
\foreachitem \N \in \Nnod{ % loop over layers
\def\lay{\Ncnt} % alias of index of current layer
\pgfmathsetmacro\prev{int(\Ncnt-1)} % number of previous layer
\message{\lay,}
\foreach \i [evaluate={\c=int(\i==\N); \y=\N/2-\i-\c*\yshift;
\index=(\i<\N?int(\i):"\Nstr[\lay]");
\x=\lay; \n=\nstyle;}] in {1,...,\N}{ % loop over nodes
% NODES
\node[node \n] (N\lay-\i) at (\x,\y) {$\Cstr[\lay]$};
% CONNECTIONS
\ifnum\lay>1 % connect to previous layer
\foreach \j in {1,...,\Nnod[\prev]}{ % loop over nodes in previous layer
\draw[connect,white,line width=1.2] (N\prev-\j) -- (N\lay-\i);
\draw[connect] (N\prev-\j) -- (N\lay-\i);
%\draw[connect] (N\prev-\j.0) -- (N\lay-\i.180); % connect to left
}
\fi % else: nothing to connect first layer
}
\path (N\lay-\N) --++ (0,1+\yshift) node[midway,scale=1.5] {$\vdots$};
}
% LABELS
\node[above=5,align=center,mygreen!60!black] at (N1-1.90) {input\[-0.2em]layer};
\node[above=1,align=center,myblue!60!black] at (N2-1.90) {hidden layer};
\node[above=10,align=center,myred!60!black] at (N\Nnodlen-1.90) {output\[-0.2em]layer};
\end{tikzpicture}
\end{document}
However, I am trying to make a figure that looks like the image below, but I don't know really where to start. Could someone please give me some advice on how to proceed? Thank you a lot.
\begin{scope} ...\end{scope}to surround your existing code then copy paste it. and add the option[yshift=10cm]to have the same figure twice out redoing all of it. Then, you need to draw the last layer and a rectangle as a Softmax – anis Jan 12 '23 at 11:52\node \n] (N\lay-\i) at (\x,\y) {$\Cstr[\lay]$};, you can see that the node is namedN<layer id>-<node id>. you can use it to link all the red nodes to all the new red nodes. – anis Jan 12 '23 at 11:54