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Follow up to confusion about terms in backpropagation calculation

Follow up to confusion about terms in backpropagation calculation

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1
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Here is the screenshot of the part I’m referring to: https://imgur.com/a/GRQEtiw
 
The following is the text from the original question:
On the Backpropagation Mathematics tab, it goes into the derivation of the update rule for the output layer. Right before section 5, I was wondering about how it got from (y_j – t_j)y_j(1 – y_j)h_i to \delta_j h_i (not sure if we can input equations here). I think I’m unclear as to how \delta_j is defined, I assumed it was the error y_j – t_j, but then there’s an extra y_j(1 – y_j). Thanks!

1 Answer

365 Team
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Hi Emily,
There is no particular trick there! 
We just define delta to be equal to that expression and start using delta from there onwards.
Best,
The 365 Team