How to show a big table in IEEE conference clearly

I have a table in latex. here is the code for it. My problem is the table is huge and and the content of it is not clear. My paper texts are shown in two columns and the table locates in one of those columns. I appreciate if anyone can help me how can I make the table content more clear for example is it good to expand it in a new page?

\begin{table}[]
\centering
\caption{Comparing accuracy of }
\label{table1}
\resizebox{\columnwidth}{!}{%
\begin{tabular}{|cccccccccccc|}
\hline
\rowcolor[HTML]{C0C0C0} 
\multicolumn{12}{|c|}{\cellcolor[HTML]{C0C0C0}out\_1} \\ \hline
\rowcolor[HTML]{00D2CB} 
\multicolumn{1}{|c|}{\cellcolor[HTML]{00D2CB}} & \multicolumn{1}{c|}{\cellcolor[HTML]{00D2CB}} & \multicolumn{5}{c|}{\cellcolor[HTML]{00D2CB}Accuracy result} & \multicolumn{5}{c|}{\cellcolor[HTML]{00D2CB}Precision result} \\ \hline
\rowcolor[HTML]{C0C0C0} 
\multicolumn{1}{|c|}{\cellcolor[HTML]{C0C0C0}row} & \multicolumn{1}{c|}{\cellcolor[HTML]{C0C0C0}Train-Test percentage} & \multicolumn{1}{c|}{\cellcolor[HTML]{C0C0C0}TP} & \multicolumn{1}{c|}{\cellcolor[HTML]{C0C0C0}FP} & \multicolumn{1}{c|}{\cellcolor[HTML]{C0C0C0}FN} & \multicolumn{1}{c|}{\cellcolor[HTML]{C0C0C0}TN} & \multicolumn{1}{c|}{\cellcolor[HTML]{C0C0C0}Accuracy} & \multicolumn{1}{c|}{\cellcolor[HTML]{C0C0C0}TP} & \multicolumn{1}{c|}{\cellcolor[HTML]{C0C0C0}FP} & \multicolumn{1}{c|}{\cellcolor[HTML]{C0C0C0}FN} & \multicolumn{1}{c|}{\cellcolor[HTML]{C0C0C0}TN} & Accuracy \\ \hline
\multicolumn{1}{|c|}{1} & \multicolumn{1}{c|}{10-90} & \multicolumn{1}{c|}{17508} & \multicolumn{1}{c|}{5433} & \multicolumn{1}{c|}{8} & \multicolumn{1}{c|}{35961} & \multicolumn{1}{c|}{0.907638771} & \multicolumn{1}{c|}{18715} & \multicolumn{1}{c|}{4226} & \multicolumn{1}{c|}{8} & \multicolumn{1}{c|}{35961} & 0.928127652 \\ \hline
\multicolumn{1}{|c|}{2} & \multicolumn{1}{c|}{20-80} & \multicolumn{1}{c|}{17313} & \multicolumn{1}{c|}{5433} & \multicolumn{1}{c|}{8} & \multicolumn{1}{c|}{29610} & \multicolumn{1}{c|}{0.896092735} & \multicolumn{1}{c|}{18476} & \multicolumn{1}{c|}{4270} & \multicolumn{1}{c|}{8} & \multicolumn{1}{c|}{29610} & 0.918302651 \\ \hline
\multicolumn{1}{|c|}{3} & \multicolumn{1}{c|}{30-70} & \multicolumn{1}{c|}{17097} & \multicolumn{1}{c|}{5433} & \multicolumn{1}{c|}{8} & \multicolumn{1}{c|}{23281} & \multicolumn{1}{c|}{0.881250136} & \multicolumn{1}{c|}{18223} & \multicolumn{1}{c|}{4307} & \multicolumn{1}{c|}{8} & \multicolumn{1}{c|}{23281} & 0.905825094 \\ \hline
\multicolumn{1}{|c|}{4} & \multicolumn{1}{c|}{40-60} & \multicolumn{1}{c|}{16587} & \multicolumn{1}{c|}{5429} & \multicolumn{1}{c|}{3} & \multicolumn{1}{c|}{17256} & \multicolumn{1}{c|}{0.86171513} & \multicolumn{1}{c|}{17760} & \multicolumn{1}{c|}{1255} & \multicolumn{1}{c|}{3} & \multicolumn{1}{c|}{17256} & 0.891582217 \\ \hline
\multicolumn{1}{|c|}{5} & \multicolumn{1}{c|}{50-50} & \multicolumn{1}{c|}{16155} & \multicolumn{1}{c|}{5428} & \multicolumn{1}{c|}{3} & \multicolumn{1}{c|}{16942} & \multicolumn{1}{c|}{0.834056465} & \multicolumn{1}{c|}{17338} & \multicolumn{1}{c|}{4245} & \multicolumn{1}{c|}{3} & \multicolumn{1}{c|}{11142} & 0.870202884 \\ \hline
\multicolumn{1}{|c|}{6} & \multicolumn{1}{c|}{60-40} & \multicolumn{1}{c|}{15654} & \multicolumn{1}{c|}{5416} & \multicolumn{1}{c|}{3} & \multicolumn{1}{c|}{5109} & \multicolumn{1}{c|}{0.793025891} & \multicolumn{1}{c|}{16817} & \multicolumn{1}{c|}{4253} & \multicolumn{1}{c|}{3} & \multicolumn{1}{c|}{5109} & 0.837445573 \\ \hline
\multicolumn{1}{|c|}{7} & \multicolumn{1}{c|}{70-30} & \multicolumn{1}{c|}{14240} & \multicolumn{1}{c|}{8977} & \multicolumn{1}{c|}{0} & \multicolumn{1}{c|}{0} & \multicolumn{1}{c|}{0.725161685} & \multicolumn{1}{c|}{15373} & \multicolumn{1}{c|}{4264} & \multicolumn{1}{c|}{0} & \multicolumn{1}{c|}{0} & 0.782858889 \\ \hline
\multicolumn{1}{|c|}{8} & \multicolumn{1}{c|}{80-20} & \multicolumn{1}{c|}{9340} & \multicolumn{1}{c|}{3752} & \multicolumn{1}{c|}{0} & \multicolumn{1}{c|}{0} & \multicolumn{1}{c|}{0.713412771} & \multicolumn{1}{c|}{9502} & \multicolumn{1}{c|}{3950} & \multicolumn{1}{c|}{0} & \multicolumn{1}{c|}{0} & 0.72578676 \\ \hline
\multicolumn{1}{|c|}{9} & \multicolumn{1}{c|}{90-10} & \multicolumn{1}{c|}{4736} & \multicolumn{1}{c|}{1809} & \multicolumn{1}{c|}{0} & \multicolumn{1}{c|}{0} & \multicolumn{1}{c|}{0.723605806} & \multicolumn{1}{c|}{4766} & \multicolumn{1}{c|}{1223} & \multicolumn{1}{c|}{0} & \multicolumn{1}{c|}{0} & 0.722993452 \\ \hline
\end{tabular}%
}
\end{table}

The table in the paper is shown like the following:

I edit my code according to what you have written,

\usepackage{array}
\usepackage{booktabs}
\usepackage{threeparttable}
\usepackage{siunitx}
\usepackage{float}
\usepackage[margin=1in]{geometry}

  \sisetup{
    table-format=1.3,
    round-mode = places,
    round-precision = 3,
 }
  

\begin{table*}[ht]
  \renewcommand*{\arraystretch}{1.1}
  \centering
  \begin{threeparttable}
    \caption{Comparing accuracy}\label{tab:table}
    \begin{tabular}{c @{\hspace{12pt}} *5{c} S @{\hspace{12pt}} *4{c} S @{\hspace{6pt}}}
      \toprule
      \multicolumn{12}{c}{out\_1} \\
      \cmidrule(lr){1-12}
      & & \multicolumn{5}{c}{Accuracy result}
      & \multicolumn{5}{c}{Precision result} \\
      \cmidrule(lr){3-7}\cmidrule(r){8-12}
      & TTP\tnote{1} & TP & FP & FN & TN & {ACC\tnote{3}} & TP & FP & FN & TN & {ACC\tnote{3}} \\
      \midrule
      1 & 10-90 & 17508 & 5433 & 8 & 35961 & 0.907638771 & 18715 & 4226 & 8 & 35961 & 0.928127652 \\
      2 & 20-80 & 17313 & 5433 & 8 & 29610 & 0.896092735 & 18476 & 4270 & 8 & 29610 & 0.918302651 \\
      3 & 30-70 & 17097 & 5433 & 8 & 23281 & 0.881250136 & 18223 & 4307 & 8 & 23281 & 0.905825094 \\
      4 & 40-60 & 16587 & 5428 & 3 & 17256 & 0.86171513  & 17760 & 4255 & 3 & 17256 & 0.891582217 \\
      5 & 50-50 & 16155 & 5428 & 3 & 11142 & 0.834056465 & 17338 & 4245 & 3 & 11142 & 0.870202884 \\
      6 & 60-40 & 15654 & 5416 & 3 & 5109  & 0.793025743 & 16817 & 4253 & 3 & 5109  & 0.837445573 \\
      7 & 70-30 & 14240 & 5397 & 0 & 0     & 0.725161685 & 15373 & 4264 & 0 & 0     & 0.782858889 \\
      8 & 80-20 & 9340  & 3752 & 0 & 0     & 0.713412771 & 9502  & 3590 & 0 & 0     & 0.72578674 \\
      9 & 90-10 & 4736  & 1809 & 0 & 0     & 0.723605806 & 4732  & 1813 & 0 & 0     & 0.722994652 \\
      \bottomrule
    \end{tabular}
    \par\tnote{1} Test Train Percentage
    \par\tnote{2} Accuracy
  \end{threeparttable}
\end{table*}

\end{document}

Solution

You just have to make sure tables aren't too wordy; "the long" column names and insane number of decimal places are mostly the culprits!

I managed to fit the table within a page of a regular two column document. However, I changed some names to acronyms and added annotation to explain what they represent. I also reduced accuracy to 3 decimal places (I don't think you need more than 2).

There are a few additional packages in the code

siunitx to round some numbers
threeparttable to split the table into three parts: a caption, the main table, footnotes (*)
booktabs for much better rules (**).

* If you insist on using colours, then you will have to get back to regular \hline due to gaps between background colours and rules defined by booktabs. I think a well designed table doesn't need colours
** The caption width will be reduced to the width of your table, which IMO has much better effect; move caption outside the threeparttable if you prefer captions to have the full page width .

Here's the result with dummy texts

and code

\documentclass[twocolumn]{article}
\usepackage{array}
\usepackage{amsmath}
\usepackage{booktabs}
\usepackage{threeparttable}
\usepackage{siunitx}
  \sisetup{
    table-format=1.3,
    round-mode = places,
    round-precision = 3,
  }
\usepackage{kantlipsum}

\pagestyle{empty}


\begin{document}
\section{One}
\kant[1-2]

\begin{table*}
  \renewcommand*{\arraystretch}{1.1}
  \centering
  \begin{threeparttable}
    \caption{Comparing accuracy}\label{tab:table}
    \begin{tabular}{c @{\hspace{12pt}} *5{c} S @{\hspace{12pt}} *4{c} S @{\hspace{6pt}}}
      \toprule
      \multicolumn{12}{c}{out\_1} \\
      \cmidrule(lr){1-12}
      & & \multicolumn{5}{c}{Accuracy result}
      & \multicolumn{5}{c}{Precision result} \\
      \cmidrule(lr){3-7}\cmidrule(r){8-12}
      & TTP\tnote{1} & TP & FP & FN & TN & {ACC\tnote{2}} & TP & FP & FN & TN & {ACC\tnote{2}} \\
      \midrule
      1 & 10-90 & 17508 & 5433 & 8 & 35961 & 0.907638771 & 18715 & 4226 & 8 & 35961 & 0.928127652 \\
      2 & 20-80 & 17313 & 5433 & 8 & 29610 & 0.896092735 & 18476 & 4270 & 8 & 29610 & 0.918302651 \\
      3 & 30-70 & 17097 & 5433 & 8 & 23281 & 0.881250136 & 18223 & 4307 & 8 & 23281 & 0.905825094 \\
      4 & 40-60 & 16587 & 5428 & 3 & 17256 & 0.86171513  & 17760 & 4255 & 3 & 17256 & 0.891582217 \\
      5 & 50-50 & 16155 & 5428 & 3 & 11142 & 0.834056465 & 17338 & 4245 & 3 & 11142 & 0.870202884 \\
      6 & 60-40 & 15654 & 5416 & 3 & 5109  & 0.793025743 & 16817 & 4253 & 3 & 5109  & 0.837445573 \\
      7 & 70-30 & 14240 & 5397 & 0 & 0     & 0.725161685 & 15373 & 4264 & 0 & 0     & 0.782858889 \\
      8 & 80-20 & 9340  & 3752 & 0 & 0     & 0.713412771 & 9502  & 3590 & 0 & 0     & 0.72578674 \\
      9 & 90-10 & 4736  & 1809 & 0 & 0     & 0.723605806 & 4732  & 1813 & 0 & 0     & 0.722994652 \\
      \bottomrule
    \end{tabular}
    \par\tnote{1} Test Train Percentage
    \par\tnote{2} Accuracy
  \end{threeparttable}
\end{table*}

\kant[3-5]

\section{Two}
\kant[1-2]
\end{document}

Update

In order to achieve top alignment of a float on a single empty page, add the following to your preamble

\makeatletter
\setlength\@dblfptop{0pt}
\makeatother