Backpropagation: how it works

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Thanks for the explanation! It's the clearest explanation I have found so far.

alexanderkorsunsky

Really liked your short videos. Thanks!

fukeya

Amazing video... simple and yet not oversimplified. Thank you very much for uploading.

dimitrab

Undoubtedly all of your videos are excellent and very comprehensible. It would be very nice if you could add some information about the topics that your cover in each videos So we can find right video easily.
Thank you.

hosseinpourghaemi

Thank you for video, it's was very easy to understand!

tommyunreal

Good day Sir. Can you please clarify your interpretation of the sigmoid function, 4:00 - 4:20? I can't hear it quite well.
This vid helped me out too, thank you.

arahflorgallardo

what exactly does a node do with for example 4 inputs? does it add them together and divide by 4 then multiply by a number? what do the weights do? is it something you do to the input number or does it tell the node something?

minecraftermad

At 5:15 Victor says "f.k times u.jk is just one component of the sum that feeds into g.j, so I just need to differentiate".

Could anyone explain that comment about differentiating? Why does that help us?

MrAgreeandDisagree

is dE/dhi outside or inside of the summation?

RigatoniModular

how are weights of edges computed and how do we know them before hand ?

abdul

Thank you for the video.

I'm sorry, I do not follow.

If g = sigma(mu + sum (mu_k*h_k) then

dg/d(h_k) = sigma'(h_k)*mu_k, which means that dg = sigma'(h_k)*mu_k * dh_k

so dE/dg = (just inserting) dE/((sigma'(h)*mu_k * dh_k ) = 1/(sigma'(h_k)*mu_k * dh_k ) *dE/d(h_k), so NOT equal to

(sigma'(h)*mu_k * dh_k ) *dE/d(h_k)

??

NisseOhlsen

too bad i havent gotten to that state of mathematics in school yet

minecraftermad

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