
\begin{tikzpicture}[scale=0.65]
    \begin{axis}[
        xlabel=$\lambda_t$,
        xtick={0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7},
        xticklabels={0, 0.1, 0.2, 0.5, 1, 2, 5},
        width=5cm,
        height=4cm,
        y tick label style={
            /pgf/number format/.cd,
            fixed,
            fixed zerofill,
            precision=2,
            /tikz/.cd
        },
        ymin=8.4,
        ymax=9,
        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={(1.2, -0.1)}, anchor=south east},
        ytick distance = 0.2,
        grid=major,
        grid style=dashed,
        ]
        \addplot[mark=square*,blue]  
          coordinates{
            (0.1, 8.62) (0.2, 8.88) (0.3, 8.92) (0.4, 8.92) (0.5, 8.89) (0.6, 8.7) (0.7, 8.46)
        };
    \end{axis}
\end{tikzpicture}
\hspace{5mm}
\begin{tikzpicture}[scale=0.65]
    \begin{axis}[
        xlabel=$\lambda_t$,
        xtick={0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7},
        xticklabels={0, 0.1, 0.2, 0.5, 1, 2, 5},
        width=5cm,
        height=4cm,
        y tick label style={
            /pgf/number format/.cd,
            fixed,
            fixed zerofill,
            precision=2,
            /tikz/.cd
        },
        ymin=5.3,
        ymax=5.8,
        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={(1.2, -0.1)}, anchor=south east},
        ytick distance = 0.1,
        grid=major,
        grid style=dashed,
        ]
        \addplot[mark=triangle*,red] 
          coordinates{
            (0.1, 5.55) (0.2, 5.68) (0.3, 5.72) (0.4, 5.76) (0.5, 5.71) (0.6, 5.57) (0.7, 5.34)
        };
    \end{axis}
\end{tikzpicture}