\section{Cosine\+Distance Class Reference}
\label{classmlpack_1_1kernel_1_1CosineDistance}\index{Cosine\+Distance@{Cosine\+Distance}}


The cosine distance (or cosine similarity).  


\subsection*{Public Member Functions}
\begin{DoxyCompactItemize}
\item 
{\footnotesize template$<$typename Archive $>$ }\\void \textbf{ serialize} (Archive \&, const unsigned int)
\begin{DoxyCompactList}\small\item\em Serialize the class (there\textquotesingle{}s nothing to save). \end{DoxyCompactList}\end{DoxyCompactItemize}
\subsection*{Static Public Member Functions}
\begin{DoxyCompactItemize}
\item 
{\footnotesize template$<$typename Vec\+TypeA , typename Vec\+TypeB $>$ }\\static double \textbf{ Evaluate} (const Vec\+TypeA \&a, const Vec\+TypeB \&b)
\begin{DoxyCompactList}\small\item\em Computes the cosine distance between two points. \end{DoxyCompactList}\end{DoxyCompactItemize}


\subsection{Detailed Description}
The cosine distance (or cosine similarity). 

It is defined by

\[ d(a, b) = \frac{a^T b}{|| a || || b ||} \]

and this class assumes the standard L2 inner product. 

Definition at line 31 of file cosine\+\_\+distance.\+hpp.



\subsection{Member Function Documentation}
\mbox{\label{classmlpack_1_1kernel_1_1CosineDistance_a9cf31d3d6cf687f6f78a15ec94f46380}} 
\index{mlpack\+::kernel\+::\+Cosine\+Distance@{mlpack\+::kernel\+::\+Cosine\+Distance}!Evaluate@{Evaluate}}
\index{Evaluate@{Evaluate}!mlpack\+::kernel\+::\+Cosine\+Distance@{mlpack\+::kernel\+::\+Cosine\+Distance}}
\subsubsection{Evaluate()}
{\footnotesize\ttfamily static double Evaluate (\begin{DoxyParamCaption}\item[{const Vec\+TypeA \&}]{a,  }\item[{const Vec\+TypeB \&}]{b }\end{DoxyParamCaption})\hspace{0.3cm}{\ttfamily [static]}}



Computes the cosine distance between two points. 


\begin{DoxyParams}{Parameters}
{\em a} & First vector. \\
\hline
{\em b} & Second vector. \\
\hline
\end{DoxyParams}
\begin{DoxyReturn}{Returns}
d(a, b). 
\end{DoxyReturn}
\mbox{\label{classmlpack_1_1kernel_1_1CosineDistance_aa5b3dd8336182f751ebec27167c22415}} 
\index{mlpack\+::kernel\+::\+Cosine\+Distance@{mlpack\+::kernel\+::\+Cosine\+Distance}!serialize@{serialize}}
\index{serialize@{serialize}!mlpack\+::kernel\+::\+Cosine\+Distance@{mlpack\+::kernel\+::\+Cosine\+Distance}}
\subsubsection{serialize()}
{\footnotesize\ttfamily void serialize (\begin{DoxyParamCaption}\item[{Archive \&}]{,  }\item[{const unsigned}]{int }\end{DoxyParamCaption})\hspace{0.3cm}{\ttfamily [inline]}}



Serialize the class (there\textquotesingle{}s nothing to save). 



Definition at line 46 of file cosine\+\_\+distance.\+hpp.



The documentation for this class was generated from the following file\+:\begin{DoxyCompactItemize}
\item 
/var/www/mlpack.\+ratml.\+org/mlpack.\+org/\+\_\+src/mlpack-\/git/src/mlpack/core/kernels/\textbf{ cosine\+\_\+distance.\+hpp}\end{DoxyCompactItemize}
