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\begin{tikzpicture}
\tikzstyle{neuronnode} = [minimum size=2.2em,circle,draw,ublue,very thick,inner sep=1pt, fill=white,align=center,drop shadow={shadow xshift=0.1em,shadow yshift=-0.1em}]
\node [anchor=west,minimum width=2.0em,minimum height=1.5em] (bias10) at (0,0.05)  {\footnotesize{${\vectorn{\emph{b}}}^{[1]}$}};
\node [anchor=west,minimum width=2.0em,minimum height=1.5em] (bias11) at ([xshift=-1.5em,yshift=-0.3em]bias10.south)  {\footnotesize{偏置1}};
\node [anchor=west,minimum width=2.0em,minimum height=1.5em] (input10) at (2,0) {\footnotesize {$x_1$}};
\node [anchor=west,minimum width=2.0em,minimum height=1.5em] (input11) at ([xshift=-2.1em,yshift=-0.3em]input10.south) {\footnotesize {天空状况}};
\node [anchor=west,minimum width=2.0em,minimum height=1.5em] (input20) at (4,0) {\footnotesize {$x_2$}};
\node [anchor=west,minimum width=2.0em,minimum height=1.5em] (input21) at ([xshift=-2.1em,yshift=-0.3em]input20.south) {\footnotesize {低温气温}};
\node [anchor=west,minimum width=2.0em,minimum height=1.5em] (input30) at (6,0) {\footnotesize {$x_3$}};
\node [anchor=west,minimum width=2.0em,minimum height=1.5em] (input31) at ([xshift=-2.1em,yshift=-0.3em]input30.south) {\footnotesize {水平气压}};

\node [neuronnode] (n10) at ([xshift=1.5em,yshift=4em]input10.east) {\tiny{$f$}\\[-1ex] \tiny{$\sum$}};
\node [anchor=west,minimum width=2.0em,minimum height=1.5em] (bias20) at ([xshift=-4em,yshift=0.5em]n10.west)  {\footnotesize {$b^{[2]}$}};
\node [anchor=west,minimum width=2.0em,minimum height=1.5em] (bias21) at ([xshift=-1.5em,yshift=-0.3em]bias20.south)  {\footnotesize {偏置2}};
\node [neuronnode] (n11) at ([xshift=1.5em,yshift=4em]input20.east){\tiny{$f$}\\[-1ex] \tiny{$\sum$}};
\draw [-,ublue] (n10.west) -- (n10.east);
\draw [-,ublue] (n11.west) -- (n11.east);
\node [neuronnode] (n20) at ([xshift=1.5em,yshift=8em]input10.east) {\tiny{$f$}\\[-1ex] \tiny{$\sum$}};
\draw [-,ublue] (n20.west) -- (n20.east);
\node [anchor=west,minimum width=2.0em,minimum height=1.5em] (output) at ([xshift=0.5em,yshift=12em]input10.east)  {\footnotesize {$y$}};

\draw [->,thick] (input10.north) -- (n10.south);
\draw [->,thick] (input20.north) -- (n10.south);
\draw [->,thick] (input20.north) -- (n11.south);
\draw [->,thick] (input30.north) -- (n11.south);
\draw [->,thick] (n10.north) -- (n20.south);
\draw [->,thick] (n11.north) -- (n20.south);
\draw [->,thick] (bias20.north) -- (n20.south);
\draw [->,thick] (n20.north) -- (output.south);
\draw [->,thick] (bias10.north) -- (n10.south);
\end{tikzpicture}
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