\section{Hoeffding\+Information\+Gain Class Reference}
\label{classmlpack_1_1tree_1_1HoeffdingInformationGain}\index{Hoeffding\+Information\+Gain@{Hoeffding\+Information\+Gain}}
\subsection*{Static Public Member Functions}
\begin{DoxyCompactItemize}
\item 
static double \textbf{ Evaluate} (const arma\+::\+Mat$<$ size\+\_\+t $>$ \&counts)
\begin{DoxyCompactList}\small\item\em Given the sufficient statistics of a proposed split, calculate the information gain if that split was to be used. \end{DoxyCompactList}\item 
static double \textbf{ Range} (const size\+\_\+t num\+Classes)
\begin{DoxyCompactList}\small\item\em Return the range of the information gain for the given number of classes. \end{DoxyCompactList}\end{DoxyCompactItemize}


\subsection{Detailed Description}


Definition at line 19 of file information\+\_\+gain.\+hpp.



\subsection{Member Function Documentation}
\mbox{\label{classmlpack_1_1tree_1_1HoeffdingInformationGain_a578c636308efbd492ea30e62f05f4d63}} 
\index{mlpack\+::tree\+::\+Hoeffding\+Information\+Gain@{mlpack\+::tree\+::\+Hoeffding\+Information\+Gain}!Evaluate@{Evaluate}}
\index{Evaluate@{Evaluate}!mlpack\+::tree\+::\+Hoeffding\+Information\+Gain@{mlpack\+::tree\+::\+Hoeffding\+Information\+Gain}}
\subsubsection{Evaluate()}
{\footnotesize\ttfamily static double Evaluate (\begin{DoxyParamCaption}\item[{const arma\+::\+Mat$<$ size\+\_\+t $>$ \&}]{counts }\end{DoxyParamCaption})\hspace{0.3cm}{\ttfamily [inline]}, {\ttfamily [static]}}



Given the sufficient statistics of a proposed split, calculate the information gain if that split was to be used. 

The \textquotesingle{}counts\textquotesingle{} matrix should contain the number of points in each class in each column, so the size of \textquotesingle{}counts\textquotesingle{} is children x classes, where \textquotesingle{}children\textquotesingle{} is the number of child nodes in the proposed split.


\begin{DoxyParams}{Parameters}
{\em counts} & Matrix of sufficient statistics. \\
\hline
\end{DoxyParams}


Definition at line 31 of file information\+\_\+gain.\+hpp.

\mbox{\label{classmlpack_1_1tree_1_1HoeffdingInformationGain_a9d801bb1be5db5207213f846f224458f}} 
\index{mlpack\+::tree\+::\+Hoeffding\+Information\+Gain@{mlpack\+::tree\+::\+Hoeffding\+Information\+Gain}!Range@{Range}}
\index{Range@{Range}!mlpack\+::tree\+::\+Hoeffding\+Information\+Gain@{mlpack\+::tree\+::\+Hoeffding\+Information\+Gain}}
\subsubsection{Range()}
{\footnotesize\ttfamily static double Range (\begin{DoxyParamCaption}\item[{const size\+\_\+t}]{num\+Classes }\end{DoxyParamCaption})\hspace{0.3cm}{\ttfamily [inline]}, {\ttfamily [static]}}



Return the range of the information gain for the given number of classes. 

(That is, the difference between the maximum possible value and the minimum possible value.) 

Definition at line 84 of file information\+\_\+gain.\+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/methods/hoeffding\+\_\+trees/\textbf{ information\+\_\+gain.\+hpp}\end{DoxyCompactItemize}