[Intro to Deep Learning with PyTorch -- L2 -- N14] Sigmoid function

The sigmoid function is defined as sigmoid(x) = 1/(1+e-x). If the score is defined by 4x1 + 5x2 - 9 = score, then which of the following points has exactly a 50% probability of being blue or red? (Choose all that are correct.)

A. (1, 1)

B. (2, 4)

C. (5, -5)

D. (-4, 5)

 

Calculator online: https://www.vcalc.com/wiki/vCalc/Sigmoid+Function