Tikz 神经网络 (LaTeX) 中不需要的额外圆圈

Question

使用此代码，输出如下。为什么我的输入层中会出现多余的空心圆圈？我该如何去除它们？

加分点：我该如何在层之间叠加权重和偏差矩阵？

    \begin{figure}
    \begin{tikzpicture}[
         % define styles 
     clear/.style={ 
         draw=none,
         fill=none
     },
     net/.style={
         matrix of nodes,
         nodes={ draw, circle, inner sep=10pt },
         %nodes in empty cells,
         column sep=2cm,
         row sep=-9pt
     },
     >=latex
]


\matrix[net] (mat)
{
|[clear]| \parbox{1.3cm}{\centering Input\\layer} 
    & |[clear]| \parbox{1.3cm}{\centering Hidden\\layer 1} 
    & |[clear]| \parbox{1.3cm}{\centering Hidden\\layer 2} 
    & |[clear]| \parbox{1.3cm}{\centering Output\\layer} \\
         
    & 10 (on)   \\

2  &                 & 13 (on) \\

     & 0 (off)   &                  & 1 \\

1  &                 & 0 (off)        \\

    & 1 (on)     \\
}
;

\foreach \ai in {3, 5} {
            \foreach \aii in {2,4,6}
                \draw[->] (mat-\ai-1) -- (mat-\aii-2);
                }
                
\foreach \ai in {2, 4, 6} {
            \foreach \aii in {3, 5}
                \draw[->] (mat-\ai-2) -- (mat-\aii-3);
                }
                
\foreach \ai in {3, 5} {
            \foreach \aii in {4}
                \draw[->] (mat-\ai-3) -- (mat-\aii-4);
                }
\end{tikzpicture}
\end{figure}

Answer 1

罪魁祸首是你的 中的空行matrix。删除它们。题外话，你可以写更简洁的代码，例如如下：

\documentclass[tikz, margin=3mm]{standalone}
\usetikzlibrary{matrix}

\begin{document}
    \begin{tikzpicture}[
         % define styles
net/.style={matrix of nodes,
            nodes = {circle, draw, text width=2.4em, align=center,
                     inner sep=0pt, anchor=center},
            row 1/.style = {nodes={rectangle, draw=none,
                            text width=4em, align=center,
                            inner sep=0pt, anchor=center}},
            column sep=12mm,
            row sep=6pt
            },
     >=latex
                    ]
\matrix[net] (mat)
{
Input layer
    & Hidden layer 1
                & Hidden layer 2
                            & Output layer \\
    & 10 (on)   &           &   \\
2   &           & 13 (on)   &   \\
    & 0 (off)   &           & 1 \\
1   &           & 0 (off)   &   \\
    & 1 (on)    &           &   \\
};

\foreach \ai in {3, 5} {
            \foreach \aii in {2,4,6}
                \draw[->] (mat-\ai-1) -- (mat-\aii-2);
                }

\foreach \ai in {2, 4, 6} {
            \foreach \aii in {3, 5}
                \draw[->] (mat-\ai-2) -- (mat-\aii-3);
                }

\foreach \ai in {3, 5} {
            \foreach \aii in {4}
                \draw[->] (mat-\ai-3) -- (mat-\aii-4);
                }
    \end{tikzpicture}
\end{document}

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