\begin
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\documentclass[11pt]{beamer}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[]{babel}
\usetheme{madrid}
\usepackage{fontspec}
\usepackage{color}
\usepackage{xcolor}
\setsansfont{Times New Roman}
\usepackage{graphics}
\usepackage{graphicx}
\usepackage{float}
\usepackage{subfigure}
\usepackage{multicol}
\usepackage{fancyhdr}
\usepackage{lipsum}
\usepackage{tikz}
\usepackage{wallpaper}
\usepackage{wrapfig}
\usepackage{multicol}
\begin{document}
\author[GG BOY]{GOOD GUYS\inst{1} }%作者
\title{Federated Learning}%大标题
\subtitle{Distributed \& Encryption}%小标题
\logo{\includegraphics[scale=0.08]{777}}%logo，默认每页都有，处在右下角
\institute[GDUT]{\inst{1} \textit{School of Mathematics and Statistics,\\ Guangdong University of Technology} }%单位
%\date{}
%\subject{}
%\setbeamercovered{transparent}
\setbeamertemplate{navigation symbols}{}%原本Madrid主题每页下面都有一些信息，这个命令是去除下方的信息，不过我用数院长的logo挡住了，删不删也看不到。
\setbeamertemplate{itemize }{circle}%定义item的形状是小圆圈
\newcommand\Background{
\begin{tikzpicture}[remember picture,overlay]
\node[inner sep=0pt,outer sep=0pt,opacity=1]
at (5.7,-4)
{\includegraphics[scale=0.23]{999}};
\end{tikzpicture}
}%定义了背景，想在哪页加背景，只需在哪页加一句\Background即可
%\setbeamertemplate{background canvas}{\includegraphics[scale=0.19]{999}}%这句命令也是定义了背景，但是没法设置指定页，必须全部页都有背景，要是不嫌背景花直接用这句命令添加背景省事。
\setbeamercolor{frametitle}{bg=gray}%定义frametitle的背景是灰色，也就是每一页上面那栏
\addtobeamertemplate{footline}{}{
\begin{tikzpicture}
{\-0.8cm\includegraphics[scale=0.2]{000}}%设置了每页footline，也就是最下面加数院的长logo
\end{tikzpicture}}
\begin{frame}[plain]
\Background%要先生成背景再生成title，要不然背景会覆盖在title页面上
\maketitle
\end{frame}
\begin{frame}
\Background
\tableofcontents
\end{frame}
\begin{frame}
\frametitle{\textsc{Idealized}}
\section{Background}
\subsection{Idealized}
\subsection{Realistic}
aaaaaaaa
\begin{examples}
bbbbbbbbbb
\end{examples}
\begin{figure}[t]
\centering
\subfigure{\includegraphics[height=3cm ]{111}}
\subfigure{\includegraphics[width=3cm]{222}}
\end{figure}
bbbbbbbbbb
\end{frame}
\begin{frame}
\frametitle{\textsc{Idealized}}
aaaaaaaaaaa
\begin{block}{Question}
bbbbbbb
\end{block}
NO NO NO
\begin{alertblock}{Important}
aaaaaa
\end{alertblock}
\end{frame}
\begin{frame}
\section{Introduction}
\subsection{Concept}
\frametitle{\textsc{Concept}}
\end{frame}
\begin{frame}
\section{Classification}
\subsection{Horizontal federated learning}
\frametitle{\textsc{Horizontal Federated Learning}}
\begin{itemize}
\item a
\item b
\item Eac
\item d
\item e
\end{itemize}
\end{frame}
\begin{frame}
\subsection{Longitudinal federated learning}
\frametitle{\textsc{Longitudinal Federated Learning}}
\begin{block}{Definition}
aaa
\end{block}
\begin{example}
ddd
\end{example}
\end{frame}
\begin{frame}
\frametitle{\textsc{Longitudinal Federated Learning}}
\end{frame}
\begin{frame}
\subsection{Transfer federated learning}
\frametitle{\textsc{Transfer Federated Learning}}
\end{frame}
\begin{frame}
\frametitle{\textsc{References}}
\Background
\end{frame}
\begin{frame}[plain]
\Background
\begin{center}
{\Huge $\mathsf{THANK YOU}$}\\
\vspace{5pt}
DA SHA BI $^{1}$ \\
\vspace{5pt}
$^{1}$ \textit{School of Mathematics and Statistics,\\ Guangdong University of Technology}
\end{center}
\end{frame}
\end{document}