为适合 2 矩阵的节点添加偏移量

Question

我对下图有 2 个问题：

1. 我只需要减少两个矩阵 N2 和 N5 之间的空间
2. 我需要将节点偏移到比它所跨越的矩阵 N2 和 N5 稍大一些

我正在这么做，[fit={([shift={(5em,2em)}]N2-1-1) ([shift={(-5em,-2em)}]N5-4-1)}但是转变不起作用。

从@Zarko 修改而来的最小工作示例例子如下：

\documentclass[margin=3mm]{standalone}
\usepackage{tikz}
\usetikzlibrary{arrows.meta,
               backgrounds,
               fit,
               matrix,
               positioning}
\usepackage{xcolor}

\begin{document}

\tikzset{
  arr/.style = {-{Triangle[scale=0.8]}, 
                draw=gray, ultra thick,
                shorten >=1mm, shorten <=1mm}, 
   en/.style = {draw=none, fill=none, text=black},
every label/.append style = {name=LN, anchor=south,     % <---
                font=\bfseries, text=black, 
                text width=10em, align=flush center,   % <---
                yshift=1ex},                           % <---
  FIT/.style = {draw=gray, fill=gray!30, rounded corners, 
                inner sep=1ex,
                fit=#1, node contents={}},
neuron/.style = {matrix of nodes,
                nodes={draw=pink, rounded corners, fill=gray!50, 
                       text height=2ex, minimum width=2em, 
                       inner sep=1mm,
                       text=#1},
                row sep=2mm,
                outer sep=0mm},
       }
 \begin{tikzpicture}[
node distance = 0mm and 1mm                            % <---
                       ]
%%%

\matrix (N2) [neuron=white,
             ]             % <---
{
|[label=Title]| a  \\
b    \\
d   \\
c     \\
};
\scoped[on background layer]
   \node (f2) [FIT=(N2-1-1) (N2-4-1)];
%%%%
\matrix (N5) [neuron=white, above right=of f2.south east]
{
|[label= Title
       ]| a      \\        % <--- longer label
b        \\
d   \\
c          \\
};
\scoped[on background layer]
   \node (f3) [FIT=(N5-1-1) (N5-4-1)];           
   % <---
\scoped[on background layer]
   \node (f4) [fit={([shift={(5em,2em)}]N2-1-1) ([shift={(-5em,-2em)}]N5-4-1)},draw=gray, fill=gray!30,rounded corners, ]{}; 
\end{tikzpicture}

\end{document}

另外，我尝试通过改变将两个矩阵放在节点 f4 前面，\scoped[on background layer]这样\scoped[]有点奏效，但随后文本和矩阵也消失了！

以下是我想要的，但两个特定矩阵之间的空间小于（其他矩阵）

Answer 1

我想这就是你想要的：

\documentclass[margin=3mm]{standalone}
\usepackage{tikz}
\usetikzlibrary{arrows.meta,
               backgrounds,
               fit,
               matrix,
               positioning}
\usepackage{xcolor}

\begin{document}

\tikzset{
  arr/.style = {-{Triangle[scale=0.8]}, 
                draw=gray, ultra thick,
                shorten >=1mm, shorten <=1mm}, 
   en/.style = {draw=none, fill=none, text=black},
every label/.append style = {name=LN, anchor=south,     % <---
                font=\bfseries, text=black, 
                text width=10em, align=flush center,   % <---
                yshift=1ex},                           % <---
  FIT/.style = {draw=gray, fill=gray!30, rounded corners, 
                inner sep=1ex,
                fit=#1, node contents={}},
neuron/.style = {matrix of nodes,
                nodes={draw=pink, rounded corners, fill=gray!50, 
                       text height=2ex, minimum width=2em, 
                       inner sep=1mm,
                       text=#1},
                row sep=2mm,
                outer sep=0mm},
       }
 \begin{tikzpicture}[
node distance = 0mm and 1mm                            % <---
                       ]
%%%

\matrix (N2) [neuron=white,
             ]             % <---
{
|[label=Title]| a  \\
b    \\
d   \\
c     \\
};
%%%%
\matrix (N5) [neuron=white, right=-2.5cm of N2.east]
{
|[label= Title]| a      \\        % <--- longer label
b        \\
d   \\
c          \\
};
          
   % <---
\scoped[on background layer]
   \node (f4) [FIT={(N2-1-1) (N5-4-1)},draw=gray, fill=gray!30,rounded corners, inner xsep=20pt,inner ysep=1.5ex]{}; 
   
\scoped[on background layer]\node (f3) [FIT=(N5-1-1) (N5-4-1)]; 
\scoped[on background layer]\node (f2) [FIT=(N2-1-1) (N2-4-1)];
\end{tikzpicture}

\end{document}