4) Fig. 7 .2 shows a final schematic of a basic neural unit. In this example the unit takes 3 input values x 1 , x 2 , and x 3 , and computes a weighted sum, multiplying each value by a weight (w 1 , w 2 , and w 3 , respectively), adds them to a bias term b, and then passes the resulting sum through a sigmoid function to result in a number between 0 and 1.