Simple template for latex file with many useful includes and comments

paper.tex

\documentclass[a4paper,10pt]{article}

% make writing commands easier
\usepackage{xparse}

% colored text
\usepackage{color}

% include eps, pdf graphics
\usepackage{graphicx}

% use "H" for floats
\usepackage{float}

% avoid "too many unprocessed floats" error
\usepackage{morefloats}

% FloatBarrier to ensure figures do not jump to different sections
\usepackage{placeins}

% properly handle spaces after defines
\usepackage{xspace}

% in case we need to span rows in our tables
\usepackage{multirow}

% tables across multiple pages
\usepackage{ltablex}

% nice-looking tables
\usepackage{booktabs}

% easy centering for tables
\newcolumntype{Y}{>{\centering\arraybackslash}X}

% math
\usepackage{algorithm}
\usepackage{algorithmicx}
\usepackage{algpseudocode}
\usepackage{amsmath,amsthm,amssymb}
\usepackage{mathtools}

% more math
\newcommand*{\defeq}{\mathrel{\vcenter{\baselineskip0.5ex \lineskiplimit0pt
                     \hbox{\scriptsize.}\hbox{\scriptsize.}}}%
                     =}

\DeclareMathOperator*{\argmax}{arg\,max}
\DeclareMathOperator*{\argmin}{arg\,min}

\newcommand{\BigO}[1]{\ensuremath{\operatorname{O}\left(#1\right)}}
\newtheorem{definition}{Definition}
\newtheorem{theorem}{Theorem}

%%%
% KL-divergence
%
%   \kld{p}{q}
%%%

\DeclarePairedDelimiterX{\infdivx}[2]{(}{)}{%
  #1\;\delimsize|\delimsize|\;#2%
}
\newcommand{\kld}[2]{\ensuremath{D_{KL}\infdivx{#1}{#2}}\xspace}

%%%
% Expectation
%
%  \expectation{X}
%
%    or
%
%  \expectation[y]{X}
%%%

\DeclareDocumentCommand \expectation { o m } {%
  \ensuremath{\mathbb{E}%
  \IfValueTF {#1} {%
    _{#1} \left[ #2 \right]%
  }{%
    \left[ #2 \right]%
  }%
  }\xspace%
}


% mono (\|), bold (\!) and fancy (\*) letters
\def\|#1{\ensuremath{\mathtt{#1}}}
\def\!#1{\ensuremath{\mathbf{#1}}}
\def\*#1{\ensuremath{\mathcal{#1}}}

\newcommand\todo[1]{\textcolor{red}{[TODO: #1]}}

\title{My Title}
\author{Me \and You}

\begin{document}

\maketitle


\end{document}