[Tex/LaTex] How to insert subfigure with caption in IEEE trans

graphicsieeetran

I am trying to insert some subfigures with caption to all the figure in IEEE trans and i don't want to span two columns. But it is not working. I want to do the following:
enter image description here .
And what i tried:

\begin{figure}[ht] 
  \begin{subfigure}[b]{0.25\linewidth}
    \centering
    \includegraphics[width=0.5\linewidth]{images/1a}
    \caption{} 
    \label{1a} 
    \vspace{4ex}
  \end{subfigure}%%
  \begin{subfigure}[b]{0.25\linewidth}
    \centering
    \includegraphics[width=0.5\linewidth]{images/1b}
    \caption{} 
    \label{1b} 
    \vspace{4ex}
  \end{subfigure}%%
  \begin{subfigure}[b]{0.25\linewidth}
    \centering
    \includegraphics[width=0.5\linewidth]{images/1c} 
    \caption{} 
    \label{1c} 
    \vspace{4ex}
  \end{subfigure}%%
  \begin{subfigure}[b]{0.25\linewidth}
    \centering
    \includegraphics[width=0.5\linewidth]{images/1d} 
    \caption{} 
    \label{1d}
    \vspace{4ex} 
    \end{subfigure}
  \caption{(a),(b)Some examples from CIFAR-10 \cite{4}. The objects in single-label
images are usually roughly aligned.(c),(d) However, the assumption of object alignment is not valid for multi-label
images. Also note the partial visibility and occlusion
between objects in the multi-label images.}
  \label{fig1} 
\end{figure}

How can i achieve it??

Best Answer

If you read IEEEtran documentation will see that it recommends not using subfigure package but subfig. And an example with subfig is explained in it.

What I understand you want is something like this:

enter image description here

which can be obtained with following code:

\documentclass{IEEEtran}
\usepackage{lipsum}
\usepackage{graphicx}
\ifCLASSOPTIONcompsoc
    \usepackage[caption=false, font=normalsize, labelfont=sf, textfont=sf]{subfig}
\else
\usepackage[caption=false, font=footnotesize]{subfig}
\fi

\begin{document}

\section{A}
\lipsum

\section{B}
\lipsum[1-3]
\begin{figure} 
    \centering
  \subfloat[a\label{1a}]{%
       \includegraphics[width=0.45\linewidth]{example-image}}
    \hfill
  \subfloat[b\label{1b}]{%
        \includegraphics[width=0.45\linewidth]{example-image}}
    \\
  \subfloat[c\label{1c}]{%
        \includegraphics[width=0.45\linewidth]{example-image}}
    \hfill
  \subfloat[d\label{1d}]{%
        \includegraphics[width=0.45\linewidth]{example-image}}
  \caption{(a), (b) Some examples from CIFAR-10 \cite{4}. The objects in     
        single-label images are usually roughly aligned.(c),(d) However, the 
        assumption of object alignment is not valid for multi-label
        images. Also note the partial visibility and occlusion
        between objects in the multi-label images.}
  \label{fig1} 
\end{figure}
\lipsum[1-5]
\end{document}
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