LaTeX image captioning text column automatic line wrapping

The effect that needs to be achieved when LaTeX makes PPT.

Two pictures side by side and add subtitles to each.
Insert a table below the picture, and the text in the table will automatically wrap.

\begin{frame}\frametitle{Many-to-many sequence transformation models\\Sequence To Sequence Models}\begin{figure}[htbp]\centering\subfigure[RNN]{\includegraphics[scale=0.25]{1-1-RNN.png} \label{1}}\quad\subfigure[CNN]{\includegraphics[scale=0.25]{1-2-CNN.png} \label{2}}\end{figure}\begin{tiny}\begin{center}\begin{tabular}{p{4cm}p{4cm}}Learning phrase representations using RNN encoder-decoder for statistical machine translation, Cho et al. & Neural machine translation in linear time, Kalchbrenner et al.\end{tabular}\end{center}\end{tiny}\end{frame}

Effect:

left text, right image

%------------------------------------------------------------------\begin{frame}{Recurrent Neural Networks}{Recurrent Neural Networks}\begin{columns}\column{0.5\textwidth}\begin{itemize}\item Model for variable-length representation learning\item for natural language problems\item LSTM and GRU are the main RNN variants\end{itemize}\column{0.5\textwidth}\begin{figure}\centering\includegraphics[width=6cm]{1-3-LSTM.png}\caption*{LSTM encoded sequence}\end{figure}\end{columns}\end{frame}

Effect: