I would really like to create multiple variations on the image attached. Even a basic template to get me started would be great.
[Tex/LaTex] Drawing a block diagram in Tikz
diagramstikz-pgf
Related Solutions
Here is the simple reconstruction. Issues:
- Left of equations, can easily be added with
node. - Make inputs and weights with
\foreach. - Increase the Activation function to be more like the original one.
- Improve TikZ styles.
Code:
\documentclass[tikz]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning}
\tikzset{basic/.style={draw,fill=blue!20,text width=1em,text badly centered}}
\tikzset{input/.style={basic,circle}}
\tikzset{weights/.style={basic,rectangle}}
\tikzset{functions/.style={basic,circle,fill=blue!10}}
\begin{document}
\begin{tikzpicture}
\node[functions] (center) {};
\node[below of=center,font=\scriptsize,text width=4em] {Activation function};
\draw[thick] (0.5em,0.5em) -- (0,0.5em) -- (0,-0.5em) -- (-0.5em,-0.5em);
\draw (0em,0.75em) -- (0em,-0.75em);
\draw (0.75em,0em) -- (-0.75em,0em);
\node[right of=center] (right) {};
\path[draw,->] (center) -- (right);
\node[functions,left=3em of center] (left) {$\sum$};
\path[draw,->] (left) -- (center);
\node[weights,left=3em of left] (2) {$w_2$} -- (2) node[input,left of=2] (l2) {$x_2$};
\path[draw,->] (l2) -- (2);
\path[draw,->] (2) -- (left);
\node[below of=2] (dots) {$\vdots$} -- (dots) node[left of=dots] (ldots) {$\vdots$};
\node[weights,below of=dots] (n) {$w_n$} -- (n) node[input,left of=n] (ln) {$x_n$};
\path[draw,->] (ln) -- (n);
\path[draw,->] (n) -- (left);
\node[weights,above of=2] (1) {$w_1$} -- (1) node[input,left of=1] (l1) {$x_1$};
\path[draw,->] (l1) -- (1);
\path[draw,->] (1) -- (left);
\node[weights,above of=1] (0) {$w_0$} -- (0) node[input,left of=0] (l0) {$1$};
\path[draw,->] (l0) -- (0);
\path[draw,->] (0) -- (left);
\node[below of=ln,font=\scriptsize] {inputs};
\node[below of=n,font=\scriptsize] {weights};
\end{tikzpicture}
\end{document}
Picture:
You can add the option -> to draw the arrows. To add the ellipses, load the shapes.geometric library, and add
nodes={ellipse,draw,minimum width=<length>}
to the list of options for the \matrix command. Here, ellipse causes the node to have an elliptical shape, draw draws the elliptical border of the node, and minimum width=<length> specifies the minimal width of the node.
Code
\documentclass[border=2pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{matrix,arrows,shapes.geometric}
\begin{document}
\begin{tikzpicture}[description/.style={fill=white,inner sep=2pt}]
\matrix (m)[matrix of math nodes,
row sep=3em,column sep=2.5em,
text height=1.5ex, text depth=0.25ex,
nodes={ellipse,draw,minimum width=2cm},
]{
X && Y \\
& V & \\
};
\path[->,font=\scriptsize]
(m-1-1) edge node[auto] {$ f $} (m-1-3)
edge node[description] {$ g \circ f $} (m-2-2)
(m-1-3) edge node[auto] {$ g $} (m-2-2);
\end{tikzpicture}
\end{document}
Output
Upadate
An example that more closely resemble your picture:
Code
\documentclass[border=2pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{calc,positioning,shapes.geometric}
\begin{document}
\begin{tikzpicture}
\tikzset{
elps/.style 2 args={draw,ellipse,minimum width=#1,minimum height=#2},
node distance=3cm,
font=\footnotesize,
>=latex,
}
\node(x)[elps={1.3cm}{1cm},label={below left:$X$}]{};
\node(y)[elps={2cm}{1.2cm},right=of x,label={below left:$Y$}]{};
\node(v)[elps={1.5cm}{.9cm},below right=2cm of x,label={below left:$V$}]{};
\fill[gray!50]($(y.center)-(5pt,5pt)$)circle[x radius=.7cm,y radius=.3cm]coordinate(im);
\node at (im){$\mathrm{im}(f)$};
\draw[->](x)to[bend right]node[above right]{$g\circ f$}(v);
\draw[->](y)to[bend left]node[right]{$g$}(v);
\draw[->](x)to[bend left=20]node[above]{$f$}(y);
\end{tikzpicture}
\end{document}
Output
Best Answer
Tips to get it done:
matrix of nodesfor positioning the nodes, as they are fitting to a grid... & |[stylename]| text & ...\draw[->] (m-1-1) edge (m-1-2)fitlibrary with a rounded rectangle node shape