Real Valued Non-Volume Preserving

Illustration of the real-valued non-volume preserving (RNVP) affine coupling layer as introduced in arxiv:1605.08803. Inspired by https://blog.evjang.com/2018/01/nf2.html.

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% Illustration of the real-valued non-volume preserving (RNVP) affine coupling layer as introduced in https://arxiv.org/abs/1605.08803.
% Inspired by https://blog.evjang.com/2018/01/nf2.html.
\documentclass[tikz]{standalone}
\usetikzlibrary{calc,positioning}
\begin{document}
\begin{tikzpicture}[
    thick, text centered,
    box/.style={draw, thin, minimum width=1cm},
    func/.style={circle, text=white},
  ]
  % x nodes
  \node[box, fill=blue!20] (x1) {$x_1$};
  \node[box, fill=blue!20, right of=x1] (x2) {$x_2$};
  \node[right of=x2] (xdots1) {\dots};
  \node[box, fill=blue!20, right of=xdots1] (xd) {$x_d$};
  \node[box, fill=green!60!black, text opacity=1, opacity=0.4, right=2 of xd] (xdp1) {$x_{d+1}$};
  \node[right of=xdp1] (xdots2) {\dots};
  \node[box, fill=green!60!black, text opacity=1, opacity=0.4, right of=xdots2] (xD) {$x_D$};
  % z nodes
  \node[box, fill=blue!20, below=3 of x1] (z1) {$z_1$};
  \node[box, fill=blue!20, right of=z1] (z2) {$z_2$};
  \node[right of=z2] (zdots1) {\dots};
  \node[box, fill=blue!20, right of=zdots1] (zd) {$z_d$};
  \node[box, fill=orange!40, right=2 of zd] (zdp1) {$z_{d+1}$};
  \node[right of=zdp1] (zdots2) {\dots};
  \node[box, fill=orange!40, right of=zdots2] (zD) {$z_D$};
  % z to x lines
  \draw[->] (z1) -- (x1);
  \draw[->] (z2) -- (x2);
  \draw[->] (zd) -- (xd);
  \draw[->] (zdp1) -- (xdp1);
  \draw[->] (zD) -- (xD);
  % scale and translate functions
  \node[func, font=\large, fill=teal, above left=0.1] (t) at ($(zd)!0.5!(xdp1)$) {$t$};
 
 
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