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\section{Methods Description} \label{sec:methods}  \subsection{GMM} \label{sec:methods-gmm}  \renewcommand{\small}[1]{#1} \renewcommand{\tiny}[1]{#1}  GMM (Gaussian mixture modeling) method maximizes the likelihood of the data set using EM (expectation-maximization) method.  1. Assume that $\textbf{x} \sim N(\mu, \sigma^2)$ (unimodal). Calculate $\mu$ and $\sigma^2$