\begin{tikzpicture}
						
	\node (input0) at (10,0.6)  {$x_{1}$};
	\node (input1) at (9,0.6)  {$x_{2}$};
	\node (input2) at (11,0.6)  {$x_{3}$};
	\node [hidden_neuron] (neuron1) at (10,2)  {$\sigma$};
	
	
	\node (output0)  at (10,3) {$y$};
	
	\draw [->] (input0) -- (neuron1);
	\draw [->] (input1) -- (neuron1);
	\draw [->] (input2) -- (neuron1);
	
	\draw [->] (neuron1) -- (output0);
	
	\node (formula)[scale=.8] at (9.2,1.3) {$w_{1}$};
	\node (formula)[scale=.8] at (9.8,1.3) {$w_{2}$};
	\node (formula)[scale=.8] at (10.3,1.3) {$w_{3}$};
	
\end{tikzpicture}