When I insert an equation in a item, there will be no indent for the next items just like this.
There are some head file included.
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\usepackage{textcomp}
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\begin{document}
\begin{itemize}
\item \textbf{Support Vector Machine (SVM).} SVMs are a set of supervised learning methods, and a SVM constructs a hyper-plane or set of hyper-planes in a high or infinite dimensional space, which used for classification, regression and outliers detection. Intuitively, a good separation is achieved by the hyper
\begin{equation}
\[\begin{align}
\text{minimize }& \frac{1}{n}\sum\limits_{i=1}^{n}{{{\zeta }_{i}}+}\lambda
{{\left\| \mathbf{w} \right\|}^{2}} \\
\text{subject to }& {{y}_{i}}(\mathbf{w}\cdot {{\mathbf{x}}_{i}}-b)\ge 1- {{\zeta }_{i}} \\ & {{\zeta }_{i}}\ge 0,i=1,...,n \\
\end{align}\]
\end{equation}
where $ \mathbf{x}_i $ is a $ p $-dimensional real vector; $ y_i $ is either
-1 or 1, denoting the different classes respectively, and $ n $ is the
length of a training dataset. $ \mathbf{w} $ is the normal vector to th
hyperplane. For each $ i\in\{1,...,n\} $, a variable $ \zeta_{i}=\text{max} (0,1-y_i(\mathbf{w}\cdot {{\mathbf{x}}_{i}}-b)) $ is introduced and it is the
smallest nonnegative number satisfying {{y}_{i}}(\mathbf{w}\cdot
{{\mathbf{x}}_{i}}-b)\ge 1-{{\zeta }_{i}}. Moreover, $ \lambda $ is a
sufficiently small value yields the hard-margin classifier for linearly
classifiable input data. This is called the primal problem [].
\item \textbf{Nearest Neighbors.} The principle behind nearest neighbor methods is to find a predefined number of training samples closest in distance to the new point, and predict the label from these.
\end{document}

