Make the label surrounding line disappear

Question

Referring to How to plot the graph below?

Is it possible to make the label surrounding lines, and the top and right lines for the coordinates disappear?

Answer 1

Continuing from the previous question:

\documentclass{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.7}
\begin{document}
{
% http://tex.stackexchange.com/questions/50313/everymath-and-set-font-for-math
\everymath{\mathsf{\xdef\mysf{\mathgroup\the\mathgroup\relax}}\mysf}

\begin{tikzpicture}[font=\sffamily]
\begin{semilogyaxis}[title=\textbf{QWS Dataset},
    legend pos=outer north east,
        legend style={draw=none},
        xtick={1,...,10},
    scaled ticks=false,
    log ticks with fixed point={1000 sep=},
        axis x line=bottom,
    axis y line=left,
        axis line style=-,
        minor tick style={draw=none},
        enlargelimits,
    width=7cm,
    ylabel = Computation Time (msec),
    xlabel = Number of Service Candidates Per Class
]
\addplot plot coordinates {(2, 48)(3,336)(4,2048)(5, 11520)(6, 61440)(7,1315392)};
\addplot plot coordinates {(2, 37)(3, 275)(4,1726)(5, 9953)(6, 55387)(7, 297786)};
\addplot plot coordinates {(2, 43)(3,252)(4, 1421)(5, 7256)(6, 37561)(7,81679)};
\legend{Unreduced, Symmetric, Asymmetric}
\end{semilogyaxis}
\end{tikzpicture}
}
\end{document}