GRU 单元 - 从 LSTM 更改为 GRU

Question

我在 LaTeX 中这样绘制 LSTM 单元格：

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{positioning, fit, arrows.meta, shapes}

% Command \empt{var1}{var2} to avoid repetition
\newcommand{\empt}[2]{$#1^{\langle #2 \rangle}$}

\begin{document}

\begin{figure}[ht]
    \centering
    \begin{tikzpicture}[
        font=\sf \scriptsize,
        >=LaTeX,
        cell/.style={
            rectangle, 
            rounded corners=5mm, 
            draw,
            very thick,
        },
        operator/.style={
            circle,
            draw,
            inner sep=-0.5pt,
            minimum height =.2cm,
        },
        function/.style={
            ellipse,
            draw,
            inner sep=1pt
        },
        ct/.style={
            circle,
            draw,
            line width = .75pt,
            minimum width=1cm,
            inner sep=1pt,
        },
        gt/.style={
            rectangle,
            draw,
            minimum width=4mm,
            minimum height=3mm,
            inner sep=1pt
        },
        mylabel/.style={
            font=\scriptsize\sffamily
        },
        ArrowC1/.style={
            rounded corners=.25cm,
            thick,
        },
        ArrowC2/.style={
            rounded corners=.5cm,
            thick,
        },
    ]

    % Drawing starts here
    \node [cell, minimum height =4cm, minimum width=6cm] {}; 

    % Draw inputs named ibox#
    \node [gt] (ibox1) at (-2,-0.75) {$\sigma$};
    \node [gt] (ibox2) at (-1.5,-0.75) {$\sigma$};
    \node [gt, minimum width=1cm] (ibox3) at (-0.5,-0.75) {Tanh};
    \node [gt] (ibox4) at (0.5,-0.75) {$\sigma$};

   % Draw operators   named mux# , add# and func#
    \node [operator] (mux1) at (-2,1.5) {$\times$};
    \node [operator] (add1) at (-0.5,1.5) {+};
    \node [operator] (mux2) at (-0.5,0) {$\times$};
    \node [operator] (mux3) at (1.5,0) {$\times$};
    \node [function] (func1) at (1.5,0.75) {Tanh};

    % Draw External inputs, named as basis c,h,x
    \node[ct, label={[mylabel]Cell}] (c) at (-4,1.5) {\empt{c}{t-1}};
    \node[ct, label={[mylabel]Hidden}] (h) at (-4,-1.5) {\empt{h}{t-1}};
    \node[ct, label={[mylabel]left:Input}] (x) at (-2.5,-3) {\empt{x}{t}};

    % Draw External outputs, named as basis c2,h2,x2
    \node[ct, label={[mylabel]Cell}] (c2) at (4,1.5) {\empt{c}{t}};
    \node[ct, label={[mylabel]Hidden}] (h2) at (4,-1.5) {\empt{h}{t}};
    \node[ct, label={[mylabel]Output}] (x2) at (2.5,3) {\empt{h}{t}};
    
% Start connecting all.
    %Intersections and displacements are used. 
    % Drawing arrows    
    \draw [ArrowC1] (c) -- (mux1) -- (add1) -- (c2);

    % Inputs
    \draw [ArrowC2] (h) -| (ibox4);
    \draw [ArrowC1] (h -| ibox1)++(-0.5,0) -| (ibox1); 
    \draw [ArrowC1] (h -| ibox2)++(-0.5,0) -| (ibox2);
    \draw [ArrowC1] (h -| ibox3)++(-0.5,0) -| (ibox3);
    \draw [ArrowC1] (x) -- (x |- h)-| (ibox3);

    % Internal
    \draw [->, ArrowC2] (ibox1) -- (mux1);
    \draw [->, ArrowC2] (ibox2) |- (mux2);
    \draw [->, ArrowC2] (ibox3) -- (mux2);
    \draw [->, ArrowC2] (ibox4) |- (mux3);
    \draw [->, ArrowC2] (mux2) -- (add1);
    \draw [->, ArrowC1] (add1 -| func1)++(-0.5,0) -| (func1);
    \draw [->, ArrowC2] (func1) -- (mux3);

    %Outputs
    \draw [-, ArrowC2] (mux3) |- (h2);
    \draw (c2 -| x2) ++(0,-0.1) coordinate (i1);
    \draw [-, ArrowC2] (h2 -| x2)++(-0.5,0) -| (i1);
    \draw [-, ArrowC2] (i1)++(0,0.2) -- (x2);

    \end{tikzpicture}
    \caption{Architecture of an LSTM unit.}
    \label{fig:lstm_architecture}
\end{figure}

\end{document}

我得到的输出是：

现在，我需要将此方案更改为 GRU（门控循环单元），但我无法更改此代码来执行此操作。如果可能的话，有人能帮我吗？它应该看起来类似于此：

我对此很陌生，确实需要一些帮助