\documentclass{article}

\usepackage[nonatbib, final]{neurips}
\usepackage[numbers]{natbib}

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\input{extra_pkgs}

\usepackage{physics}
\usepackage{mathtools}
\DeclarePairedDelimiter\p{(}{)}
\DeclarePairedDelimiter\n{|}{|}
\DeclarePairedDelimiter\B{[}{]}

\title{}

\author{
    Bojian Zheng \\
    University of Toronto \\
    \href{mailto:bojian@cs.toronto.edu}{bojian@cs.toronto.edu}
}

\begin{document}

\maketitle



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\end{document}