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Right now reading this book about Neuron Network in C#[^], yeah! 
Ok, I have to say it does help me go into a subject which has always been nebulously mysterious until thus far, so.. it must be good right? 
On the other hand the book is somewhat obscure (luckily I am very keen to understand WTF is going on!!), it is riddled with very average programming and... really really poor math!
I mean where in the world the derivative of 1 / (1 + exp(-x)) is even remotely related x * (1 - x) ?!?
Well in the book that's where[^]!!  
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If you pick x as Sigmoid(actualX) it's fine
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not sure what you mean...
far from 0 this function is approximate to (const) 1, hence its derivative is approximately 0, and it its integration function (not sure of English name) would be x (is it what you mean?).
but:
1. x is the approximation of the .. integration (? not sure of name), not the derivative
2. -x^2 != x, where -x^2 is the value he suggest
3. -d^2 + d (the value he suggest) has 0s for x = 0,1, 1/(1=exp(-x))'s derivative has no 0, i.e. it behave very differently
[EDIT]
Ho, I just got it!
You suggest I could use (x) as activation function, right?
No worries, it's even in the book!
You just confused me with your terse off topic answer!  
modified 12-Aug-15 10:44am.
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If that sigmoid thing is s(x) = 1/(1 + exp(-x)) then its derivative is s(x) * (1 - s(x))
So either the author of that code was confused and mixed his x's and s(x)'s, or it's correct but used in a way that is not immediately obvious from that implementation.
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Ho... I see...
what a strange notation hey!
And from the book so far it's not obvious that is what was needed!
Thanks, might help me in my deciphering more of the book tonight!
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I found out the guy right next to me at my new job is on codeproject. Not sure his username.
Elephant elephant elephant, sunshine sunshine sunshine
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loctrice wrote: Not sure his username.
That illegal key logger not doing its full job then ... ?
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Guessing as soon as the keylogger picked up "give code plzzzz", loctrice turned it off in disgust
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Try and get him to casually bring it up.
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Maybe he is not logged on, and only lurks.
YOU HAVE A STALKER !!!
I'd rather be phishing!
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There's a mirror, right next to you...
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No on speaking terms - yet...
Skipper: We'll fix it.
Alex: Fix it? How you gonna fix this?
Skipper: Grit, spit and a whole lotta duct tape.
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If he talked to him and asked, they would be.
Jeremy Falcon
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I'm not sure I want him to know who I am.
Yeah, he can just find out by searching I guess.
Elephant elephant elephant, sunshine sunshine sunshine
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loctrice wrote:
I'm not sure I want him to know who I am. |
That is the reason I use a fake handle. Anonymity is nice, sometimes.
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Me too, but I thought I had my name on my profile. Turns out I don't.
Elephant elephant elephant, sunshine sunshine sunshine
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Tell him you're implementing a hotel booking system and need the codes urgently, then shoulder-surf his account login.
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I didn't know we hired a new one?
In Word you can only store 2 bytes. That is why I use Writer.
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Probably nobody really cares...
Try punching him in the face instead... find out if he trains UFC.
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I have an MVP certificate up in my cube. So far no one's mentioned it. 
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Here's a novel idea: *talk to him*
PooperPig - Coming Soon
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Elephant elephant elephant, sunshine sunshine sunshine
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