What kind of derivative is used in neural networks? via /r/learnprogramming


What kind of derivative is used in neural networks?

In this question here I learned that there are multiple types of derivatives. I was under the impression that the derivative always told you exactly how much the output (y) would change with a certain input (x) given a function, however this is apparently not true.

As I attempt to understand the nuances of this, it would help to know: when we find the partial derivative of the cost function w.r.t a certain weight in a neural network, is this a derivative (apparently not exact) or a discrete derivative (apparently exact)?


Or… does it not really matter because all we're trying to figure out is whether or not the weight raises the output or lowers it?

Submitted July 16, 2017 at 11:07AM by ClearlyCoder
via reddit http://ift.tt/2tg65zZ

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