LaTeX usage notes

　　Implement a classification style, as shown in the figure:

　　Code:

\left\{
    \begin{aligned}
        Supervised learning\left\{
            \begin{aligned}
                return\\
                Classification
            \end{aligned}
        \right.
\\
        Unsupervised learning\{
            \begin{aligned}
                clustering
            \end{aligned}

    \end{aligned}
\right.

　　Note that the . after right is very important, which means to end the corresponding \left.