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\begin{tikzpicture}
\begin{scope}

\tikzstyle{neuronnode} = [minimum size=1.5em,circle,draw,ublue,very thick,fill=white,drop shadow={shadow xshift=0.1em,shadow yshift=-0.1em}]

\node [anchor=center,neuronnode] (neuron00) at (0,0) {};
\node [anchor=center,neuronnode] (neuron01) at ([yshift=-3em]neuron00) {};
\node [anchor=center,neuronnode] (neuron02) at ([yshift=-3em]neuron01) {};

\node [anchor=east] (x0) at ([xshift=-6em]neuron00.west) {$x_1$};
\node [anchor=east] (x1) at ([xshift=-6em]neuron01.west) {$x_2$};
\node [anchor=east] (x2) at ([xshift=-6em]neuron02.west) {${\vectorn{\emph{b}}}$};

\node [anchor=west] (y0) at ([xshift=4em]neuron00.east) {$y_1$：\scriptsize{温度}};

\draw [->,red!50,line width=0.4mm] (x0.east) -- (neuron00.180) node [pos=0.1,above] {\tiny{$w_{11}$}};
\draw [->,red!50,line width=0.4mm] (x1.east) -- (neuron00.200) node [pos=0.1,above] {\tiny{$w_{21}$}};
\draw [->,red!50,line width=0.4mm] (x2.east) -- (neuron00.220) node [pos=0.05,above,yshift=0.3em] {\tiny{$b_{1}$}};
\draw [->,red!30,line width=0.4mm] (neuron00.east) -- (y0.west);

\node [anchor=west] (y1) at ([xshift=4em]neuron01.east) {$y_2$：\scriptsize{湿度}};

\draw [->,blue!50,line width=0.4mm] (x0.east) -- (neuron01.160) node [pos=0.4,above] {\tiny{$w_{12}$}};
\draw [->,blue!50,line width=0.4mm] (x1.east) -- (neuron01.180) node [pos=0.35,above,yshift=-0.2em] {\tiny{$w_{22}$}};
\draw [->,blue!50,line width=0.4mm] (x2.east) -- (neuron01.200) node [pos=0.3,below,yshift=0.2em] {\tiny{$b_{2}$}};
\draw [->,blue!30,line width=0.4mm] (neuron01.east) -- (y1.west);

\node [anchor=west] (y2) at ([xshift=4em]neuron02.east) {$y_3$：\scriptsize{风力}};

\draw [->,ugreen!50,line width=0.4mm] (x0.east) -- (neuron02.140) node [pos=0.1,below,yshift=-0.2em] {\tiny{$w_{13}$}};
\draw [->,ugreen!50,line width=0.4mm] (x1.east) -- (neuron02.160) node [pos=0.1,below] {\tiny{$w_{23}$}};
\draw [->,ugreen!50,line width=0.4mm] (x2.east) -- (neuron02.180) node [pos=0.3,below] {\tiny{$b_{3}$}};
\draw [->,ugreen!30,line width=0.4mm] (neuron02.east) -- (y2.west);

\end{scope}
\end{tikzpicture}



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