
\begin{tikzpicture}[scale=0.6]
    \begin{axis}[
        xtick={0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9},
        xticklabels={0.01, 0.02, 0.05, 0.1, 0.2, 0.5, 1, 2, 5},
        width=6.5cm,
        height=5cm,
        y tick label style={
            /pgf/number format/.cd,
            fixed,
            fixed zerofill,
            precision=2,
            /tikz/.cd
        },
        ymin=6.45,
        ymax=6.7,
        x tick label style={rotate=45},
        legend style={font=\small},
        ylabel=\textbf{Recall@10},
        y label style={at={(0.75, 1.03)},rotate=270,anchor=south east},
        x label style={at={(1.05, -0.1)}, anchor=south east},
        xlabel=$\bm{\epsilon}$,
        ytick distance = 0.05,
        grid=major,
        grid style=dashed,
        ]
        \addplot[mark=square*,blue] 
          coordinates{
            (0.1, 6.57) 
            (0.2, 6.52) 
            (0.3, 6.6) 
            (0.4, 6.6) 
            (0.5, 6.5) 
            (0.6, 6.65) 
            (0.7, 6.61)
            (0.8, 6.66) 
            (0.9, 6.62)
        };
    \end{axis}
\end{tikzpicture}\hspace{3mm}
\begin{tikzpicture}[scale=0.6]
    \begin{axis}[
        xtick={0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9},
        xticklabels={0.01, 0.02, 0.05, 0.1, 0.2, 0.5, 1, 2, 5},
        width=6.5cm,
        height=5cm,
        y tick label style={
            /pgf/number format/.cd,
            fixed,
            fixed zerofill,
            precision=2,
            /tikz/.cd
        },
        ymin=5.2,
        ymax=5.4,
        x tick label style={rotate=45},
        legend style={font=\small},
        ylabel=\textbf{NDCG@10},
        y label style={at={(0.75, 1.03)},rotate=270,anchor=south east},
        x label style={at={(1.05, -0.1)}, anchor=south east},
        xlabel=$\bm{\epsilon}$,
        ytick distance = 0.05,
        grid=major,
        grid style=dashed,
        ]
        \addplot[mark=triangle*,red] 
          coordinates{
            (0.1, 5.31) 
            (0.2, 5.26) 
            (0.3, 5.32) 
            (0.4, 5.28) 
            (0.5, 5.23) 
            (0.6, 5.3) 
            (0.7, 5.28)
            (0.8, 5.31) 
            (0.9, 5.3)
        };
    \end{axis}
\end{tikzpicture}