\documentclass[tikz,border=5pt]{standalone}
\usepackage{xcolor}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}
\pgfplotsset{width=1.0\columnwidth}
\begin{document}
\begin{tikzpicture}
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\end{axis}
\begin{axis}[at={(20em,0)},width=.4\textwidth,height=.25\textwidth,xtick={0,0.2,...,1.0},ytick={80,85,...,105},grid style=dashed,ylabel={LightGBM $\rho$ (\%)},xlabel={{Training Tokens (B)}},xlabel style={align=center,yshift=0em},ylabel style={yshift=0},y tick style={opacity=0},ymajorgrids=true,xmajorgrids=true,tick align=inside,legend pos=outer north east,yticklabel style={/pgf/number format/precision=0,/pgf/number format/fixed zerofill},legend style={yshift=-1.0em,xshift=0.5em,legend cell align=left,legend plot pos=right,draw=none},xmin=-0.1,xmax=1.1,ymin=80,ymax=100]
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\legend{{512},{128},{64}}
\end{axis}
\end{tikzpicture}
\end{document}