A brain doesn't just pass on every signal; it "fires" only when a signal is strong enough. We use a to squash our sum into a number between 0 and 1. Formula: =1/(1+EXP(-SumCell))
=SUMPRODUCT(E1:E5, F$1:F$5)
To truly "build neural network with ms excel new," you wrap the entire forward/backward pass into a LAMBDA function. build neural network with ms excel new