使用 tizk 繪製單一神經單元

Question

我想畫下圖：

以下是我的乳膠代碼：

  \documentclass{article}

\usepackage{tikz}
\usetikzlibrary{positioning,arrows.meta,calc}

\tikzset{
  arro/.style={
    ->,
    >=latex
  },
  bloque/.style={
    draw,
    minimum height=1cm,
    minimum width=0.5cm
  }  
}

\begin{document}

\begin{tikzpicture}[]
\node[]
  (input)
  {Input};
\node[below=of input,label={left:$x_{1}$}]
  (inputi)
  {};
\node[below=of inputi,label={left:$x_{2}$}]
  (inputii)
  {};
\coordinate[below=of inputii] (aux);  
\node[below=of aux,label={left:$x_{3}$}]
  (inputiii)
  {};
\node[below=of inputiii,label={left:$+1$}]
  (inputiv)
  {};

\node[right=of input]
  (proje)
  {Projection};
\node[circle,label={above:\textsc{sum}}]
  at (proje|-aux)
  (projei)
  {};

\node[right=of proje]
  (out)
  {Output};
\node[label={right:$h_{w,b}(x)$}]
  at (out|-aux)
  (outi)
  {};

\foreach \Valor in {i,ii,iii,iv}
{
  \draw[arro] (input\Valor) -- (projei);
}  
\draw[arro] (projei) -- (outi);
\end{tikzpicture}

\end{document}

我得到的是：

我嘗試添加以下程式碼：\begin{tikzpicture}[every node/.style={draw=black,circle}]

並得到這個：

有人可以幫我嗎？謝謝你！

Answer 1

您自己幾乎已經回答了這個問題，但您不想畫出每個節點的輪廓，而只想畫出一個。因此，您需要將其draw作為選項新增至該一個節點。若要增加尺寸，您minimum size=1cm也可以新增例如，如果您想變更顏色，請新增顏色名稱。

在下面的程式碼中，我剛剛添加了一行，如註釋所示。

  \documentclass{article}

\usepackage{tikz}
\usetikzlibrary{positioning,arrows.meta,calc}

\tikzset{
  arro/.style={
    ->,
    >=latex
  },
  bloque/.style={
    draw,
    minimum height=1cm,
    minimum width=0.5cm
  }  
}

\begin{document}

\begin{tikzpicture}[]
\node[]
  (input)
  {Input};
\node[below=of input,label={left:$x_{1}$}]
  (inputi)
  {};
\node[below=of inputi,label={left:$x_{2}$}]
  (inputii)
  {};
\coordinate[below=of inputii] (aux);  
\node[below=of aux,label={left:$x_{3}$}]
  (inputiii)
  {};
\node[below=of inputiii,label={left:$+1$}]
  (inputiv)
  {};

\node[right=of input]
  (proje)
  {Projection};
\node[circle,
   draw,minimum size=1cm,orange, %% <-- these are added
   label={above:\textsc{sum}}]
  at (proje|-aux)
  (projei)
  {};

\node[right=of proje]
  (out)
  {Output};
\node[label={right:$h_{w,b}(x)$}]
  at (out|-aux)
  (outi)
  {};

\foreach \Valor in {i,ii,iii,iv}
{
  \draw[arro] (input\Valor) -- (projei);
}  
\draw[arro] (projei) -- (outi);
\end{tikzpicture}

\end{document}

我還建議您不要使用label左側的輸入節點和輸出節點。還有一些其他的小改動：

\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{positioning,arrows.meta,calc}

\tikzset{
  arro/.style={
    ->,
    >=latex
  },
  bloque/.style={
    draw,
    minimum height=1cm,
    minimum width=0.5cm
  }  
}

\begin{document}

\begin{tikzpicture}[node distance=0.5cm and 1cm] % first value vertical distance, second horizontal
\node
  (input)
  {Input};
\node[below=of input]
  (inputi)
  {$x_{1}$};
\node[below=of inputi]
  (inputii)
  {$x_{2}$};
\coordinate[below=of inputii] (aux);  
\node[below=of aux]
  (inputiii)
  {$x_{3}$};
\node[below=of inputiii]
  (inputiv)
  {$+1$};

\node[right=of input]
  (proje)
  {Projection};
\node[circle,
   draw,minimum size=1cm,orange, 
   label={above:\textsc{sum}}]
  at (proje|-aux)
  (projei)
  {};

\node[right=of proje]
  (out)
  {Output};
\node
  at (out|-aux)
  (outi)
  {$h_{w,b}(x)$};

\foreach \Valor in {i,ii,iii,iv}
{
  \draw[arro] (input\Valor) -- (projei);
}  
\draw[arro] (projei) -- (outi);
\end{tikzpicture}
\end{document}

Answer 2

稍微複雜簡潔的替代方案:-)：

\documentclass[tikz, margin=3mm]{standalone}
\usetikzlibrary{arrows.meta, calc, chains, positioning}

\begin{document}
    \begin{tikzpicture}[
node distance = 4mm and 16mm,
  start chain = going below,
  arro/.style = {-Latex},
bloque/.style = {text width=4ex, inner sep=1pt, align=right, on chain},
                        ]
% inputs
\foreach \i [count=\j] in {1, 2, 3, +1}
    \node[bloque] (in-\j) {$x_{\i}$};
% output
\node (out) [circle, draw=orange, minimum size=6mm,
      label=\textsc{sum},
      right=of $(in-2)!0.5!(in-3)$]  {};
% conections
\foreach \i in {1,...,4}
    \draw[arro] (in-\i) -- (out);
% output
\coordinate[right=of out] (output);
\draw[arro] (out) -- (output) node[right]   {$h_{w,b}(x)$};
% layer labels
\node[above=of in-1.center]     {Input};
\node[above=of in-1 -| out]     {Projection};
\node[above=of in-1 -| output]  {Ouput};
    \end{tikzpicture}
\end{document}