Sphinx(latex→PDF)で図がはみ出さないようにする方法 ref: http://qiita.com/t2ru/items/a19560dc707bf77c432b

conf.py

# 末尾に追加

latex_elements['preamble'] = r'''
\usepackage[export]{adjustbox}
\usepackage{letltxmacro}
\LetLtxMacro{\origincludegraphics}{\includegraphics}
\renewcommand*\includegraphics[2][max width=\textwidth,max height=\textheight,keepaspectratio]{%
\begin{figure}[htbp]
\origincludegraphics[#1]{#2}
\end{figure}
}
'''