documentclass{article}
usepackage{caption}
usepackage{adjustbox}
usepackage{setspace}

usepackage[margin=1in]{geometry}
usepackage{multirow,tabularx}
renewcommand{tabularxcolumn}[1]{m{#1}}
newcolumntype{Y}{>{centeringarraybackslash}X}
renewcommand{arraystretch}{2}
begin{document}pagestyle{empty}

begin{table}
    parbox{1linewidth}{
        centering

    begin{tabular}{|l|l|l|}
        hline
    textbf{Dataset}    &textbf{ Method }&textbf{ Best Hyperparameters } \ hline
    100K    & BSVD Bias & $k=50$, $gamma =0.01$, $lambda=0.1$  \hline
    1M  & BSVD Bias & $k=50$, $gamma =0.01$, $lambda=0.1$\ hline
    end{tabular}


caption{Foo}
}
parbox{1linewidth}{
    centering
    begin{tabular}{|l|l|l|}
        hline
        textbf{Dataset}    &textbf{ Method }&textbf{ Aerage RMSE } \ hline
        100K    & BSVD Bias &  $0.9175$  \hline
        1M  & BSVD Bias & $0.8620$ \ hline
    end{tabular}

caption{Bar}

end{table}
end{document}

documentclass{article}
usepackage{caption}
usepackage{adjustbox}
usepackage{setspace}

usepackage[margin=1in]{geometry}
usepackage{multirow,tabularx}
renewcommand{tabularxcolumn}[1]{m{#1}}
newcolumntype{Y}{>{centeringarraybackslash}X}
renewcommand{arraystretch}{2}
begin{document}pagestyle{empty}

begin{table}

        centering

    begin{tabular}{|l|l|l|}
        hline
    textbf{Dataset}    &textbf{ Method }&textbf{ Best Hyperparameters } \ hline
    multirow{2}{*}{100K}    & BSVD Bias & $k=50$, $gamma =0.01$, $lambda=0.1$  \cline{2-3}
                & Proposed Method   &   X\hline
    multirow{2}{*}{1M}  & BSVD Bias & $k=50$, $gamma =0.01$, $lambda=0.1$\cline{2-3}
                & Proposed Method   &   X\
     hline
    end{tabular}

caption{Foo}

centering
begin{tabular}{|l|l|l|}
hline
        textbf{Dataset}    &textbf{ Method }&textbf{ Aerage RMSE } \ hline
        multirow{2}{*}{100K}    & BSVD Bias            &   $0.9175$  \cline{2-3}
                & Proposed Method   &   X \hline
        multirow{2}{*}{1M}     & BSVD Bias             &   $0.8620$ \cline{2-3}
                & Proposed Method   &   X\
hline

    end{tabular}

caption{Bar}

end{table}
end{document}