我对以下 tikz 图形感到困惑。如能得到任何帮助我将不胜感激。
编译下面的代码，出现以下错误图：
\pdfminorversion=4
\NeedsTeXFormat{LaTeX2e}[1994/12/01]
\documentclass[11pt]{article}
\usepackage{amsthm,amssymb}
\usepackage[leqno]{amsmath}
\newif\ifmicrotype
\DeclareOption{microtype}{\microtypetrue}
\ProcessOptions\relax
\AtBeginDocument{
\def\tempaa{\thesection.\arabic{equation}}
\ifx\theequation\tempaa
\def\theequation{\thesection\hbox{--}\arabic{equation}}
\fi
\ifmicrotype
\RequirePackage{microtype}%
\DeclareMicrotypeAlias{mnt}{ptm}%
\fi
\DeclareMathSizes{10} {10} {7}{6}
\DeclareMathSizes{10.95}{10.95}{8}{6}
}
\headsep 23pt
\footskip 35pt
\hoffset -4truemm
\voffset 12.5truemm
\newskip\stdskip %
\stdskip=6.6pt plus3.3pt minus3.3pt
\setlength{\textheight}{7.5in}
\setlength{\textwidth}{5.2in}
\flushbottom
\setlength{\parindent}{0pt}
\setlength{\parskip}{\stdskip}
\setlength{\medskipamount}{\stdskip}
\setlength{\mathsurround}{0.8pt}
\setlength{\labelsep}{0.75em}
\newcommand{\stdspace}{\hskip 0.75em plus 0.15em \ignorespaces}
\let\qua\stdspace
\renewcommand{\baselinestretch}{1.05}
\newcommand{\ppar}{\par\goodbreak\medskip}
\newcommand{\sh}[1]{\penalty-800\ppar{\bf #1}\par\medskip\nobreak}
\newcommand{\rk}[1]{\ppar{\bf #1}\stdspace}
\usepackage{tikz-cd}
\begin{document}
$$\begin{tikzcd}
{ H_2(\mathbf S', \partial \mathbf S')\cong \mathbb Z} \arrow[d, "\times \deg(f_\text{res})"'] \arrow[rr, "{\large 1\longmapsto \overset{k}{\oplus} 1}"] & & {\large \overset{k}{\oplus}\mathbb Z\cong H_1(\partial \mathbf S')} \arrow[d, "{\large\overset{k}{\oplus} 1\longmapsto \overset{k}{\oplus} (\pm 1)\bigoplus \overset{3-k}{\oplus} 0}"] \\
{\large H_2(\mathbf P,\partial \mathbf P)\cong \mathbb Z} \arrow[rr, "{\large 1\longmapsto \overset{3}{\oplus}1}"] & & {\large \overset{3}{\oplus}\mathbb Z\cong H_1(\partial \mathbf P)}
\end{tikzcd}$$
\end{document}