More Vectorization Examples (C1W2L12)

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Around 4:04, you show the equations inside the for loop. In these, you wrote that "dz = a(1−a)". However, during course C1W2L10 (Gradient Descent on m Examples), around time 4:35, we use "dz = a−y". I could re-derive this last equation (it is indeed "dz = a−y"). I therefore believe there is an error in this course, isn't it ? Thank you

DJmates
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6:15 Andrew gets excited of Vectorization! CUTE!!!

EranM
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So this video is the only 1080p in all courses?

shanefeng
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But all this efficiency gain is really just because numpy is a more efficient C implementation, right?
Cause at the end of the day, what's calculated is STILL in some way or other w(i)*x(i) and then summing it all up.

Ezechielpitau
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I was wondering, if we had to/ or want to know the Big O of our calculation, how do we do that with single Numpy function.

MuhammadHamza-jcji
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dzi = ai (1-ai ).. wasnt it dzi = ai - yi ???

lennylinus