I am a newcomer to Tikz and have been trying to draw an recurrent neural network Long-Short Term Memory (LSTM) cell in Tikz, but have trouble correctly aligning the boxes I need inside the cell. The LSTM cell looks as follows

I have the following attempt, but clearly it's a far way from being done.

The code is

```
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{positioning, fit, arrows.meta, shapes}
\begin{document}
\begin{tikzpicture}[
elementwiseoperation/.style={circle, draw, inner sep=0pt},
elementwisefunction/.style={ellipse, draw, inner sep=1pt},
ct/.style={circle, draw, minimum width=1cm, inner sep=1pt},
gt/.style={rectangle, draw, minimum width=4mm, minimum height=3mm, inner sep=1pt},
filter/.style={circle, draw, minimum width=8mm, inner sep=1pt, path picture={\draw[thick, rounded corners] (path picture bounding box.center)--++(65:2mm)--++(0:1mm);
\draw[thick, rounded corners] (path picture bounding box.center)--++(245:2mm)--++(180:1mm);}},
mylabel/.style={font=\scriptsize\sffamily},
>=LaTeX
]
% Input cell
\node[ct, label={[mylabel]Cell}] (ct1) {$c^{t-1}$};
% Input hidden
\node[ct, below=3cm of ct1.south, label={[mylabel]Hidden}] (ht1) {$h^{t-1}$};3
% Input x
\node[ct, below right=1cm and 1 cm of ht1, label={[mylabel]left:Input}] (xt1) {$x^{t}$};
% Elementwise operations on cell
\node[elementwiseoperation, right=1.5cm of ct1] (mul1) {$\times$};
\node[elementwiseoperation, right=of mul1] (add1) {$+$};
%
\coordinate[left of=mul1] (celllinesplit0);
\coordinate[right of=add1] (celllinesplit1);
\coordinate[right of=celllinesplit1] (celllinesplit2);
\coordinate[above=of xt1, right=of ht1] (h and x join);
% New cell
\node[elementwisefunction, below=of celllinesplit1] (tanh) {tanh};
\node[elementwiseoperation, below of=add1] (mul2) {$\times$};
\node[ct, right of=celllinesplit1, label={[mylabel]Cell}] (ct2) {$c^{t}$};
\node[gt, below of=mul2] (cellbox) {tanh};
\node[gt, left=2mm of cellbox] (inputbox) {$\sigma$};
\node[gt, left=2mm of inputbox, below=of mul1] (forgetbox) {$\sigma$};
\node[gt, right=2mm of cellbox] (outputbox) {$\sigma
\draw[->] (ct1) to (mul1);
\draw[->] (mul1) to (add1);
\draw[->] (mul2) to (add1);
\draw[->] (add1) to (ct2);
\draw[->] (add1) to[out=0,in=90] (tanh);
\draw[->] (forgetbox) to (mul1);
\draw[-] (xt1) to (h and x join)[in=0];
\draw[-] (ht1) to (h and x join)[in=0];
\end{tikzpicture}
\end{document}
```

Thanks in advance for any attempt at this, it is much appreciated.

## Best Answer

Just for fun, and to prove that the arrow paths with corners can be rounded. An option using absolute positioning, and labeled coordinates, with intersectiĆ³ns

`(A|-B)`

, and displacements`++(a,b)`

.RESULT:

MWE: