August 13th, 2019, 06:16 AM  #1 
Newbie Joined: Aug 2019 From: Italy Posts: 2 Thanks: 0  Chain code and neural networks
I'm reading Tariq Rashid's book "Make Your Own Neural Network". It is a brilliant introduction to NNs (rare to see a technical book so engaging to all ranges of abilities)...but I think there is a typo which is not in the online errata for the book. See the attached image. I don't think the 2 in the last equation is correct, shouldn't it be simply 2? It could be that the author has anticipated himself, because the error function derivative is actually taken away from the weights in the neural network. But as far as the maths go, should that be 2 or simply 2? It could also be that I don't understand the chain code! 
August 13th, 2019, 07:50 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,921 Thanks: 2203 
Differentiating (1  u)² = 1  2u + u² w.r.t. u gives 2 + 2u = 2(1  u).

August 13th, 2019, 08:45 PM  #3 
Newbie Joined: Aug 2019 From: Italy Posts: 2 Thanks: 0  

Tags 
chain, chain code, code, differentiation, networks, neural, neural networks 
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