\begin{tikzpicture}
	\node (input5) at (7.5,-0.1)  {$x_{0}=1$};
	\node (input0) at (9,-0.1)  {$x_1$};
	%\node (input1) at (9,-0.1)  {$x_{2}$};
	\node (input2) at (10.5,-0.1)  {$x_2$};
	%\node (input3) at (11,-0.1)  {$..$};
	\node (input4) at (11.8,-0.1)  {$x_3$};

	\node [hidden_neuron] (neuron1) at (10,2)  {};


	\node (output0)  at (10,3.5) {$y$};

	\draw [->] (input0) -- (neuron1);
	%\draw [->] (input1) -- (neuron1);
	\draw [->] (input2) -- (neuron1);
	%\draw [->] (input3) -- (neuron1);
	\draw [->] (input4) -- (neuron1);
	\draw [->] (input5) -- (neuron1);

	\draw [->] (neuron1) -- (output0);

	\node (formula)[scale=.8] at (7.6,0.6) {$w_{0} = -\theta$};
	\node (formula)[scale=.8] at (9.0,0.6) {$w_{1}$};
	%\node (formula)[scale=.8] at (9.1,0.6) {$w_{2}$};
	\node (formula)[scale=.8] at (10.1,0.6) {$w_{2}$};
	%\node (formula)[scale=.8] at (10.4,0.6) {$..$};
	\node (formula)[scale=.8] at (10.9,0.6) {$w_{3}$};
\end{tikzpicture}