#🔒 Back propogation

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wild scroll
weary charmBOT
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@wild scroll

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slow nova
wild scroll
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ive done A

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i dont know how to do B

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@slow nova

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Do u want my code on A?

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x1 = 0.5
b1 = -0.2
b2 = 0.4
w1 = 0.2
w2 = 0.8
yt = 0.4
n1 = 0.1
def z(v):
return 1/(1+e**-v)

weary charmBOT
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Hey @wild scroll!

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wild scroll
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h1 = x1 * w1 + b1
O1 =z(h1) * w2 + b2
y = z(O1)
y

slow nova
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@wild scroll I don't want to mislead you, so I'll need time to work it out on my own

wild scroll
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👍

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U should probably check A

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im not sure if its correct

wild scroll
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@slow nova

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Do u know how I can find the derivative using code

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Like i want to find the derivative of Err

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Err = ((1/2) * (yt - y)**2)
Err

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How would I do that?

slow nova
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you know that y is sigmoid(o1), and you know that o1 is sigmoid(h1)w2) + b2

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etc

wild scroll
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so confused

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how do i do differntiation in python

slow nova
slow nova
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but the first line here is the formula for updating w2. and then the first two lines of the derivative.

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and then you'd do the same thing but replace w2 with w1

wild scroll
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i know how to find the derivative

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i just dont know how to write it down in code

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and the way ur supposed to do it

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is this

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new weight = old weight - learning rate * partial derivative of errpr respect to weigt

slow nova
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expressed only in terms of functions and values that are already defined

wild scroll
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so e.g

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nw1 = w1 - n1 * Err`

slow nova
# wild scroll nw1 = w1 - n1 * Err`

you have to actually solve the derivative until you only have operations like multiplication, division, addition, subtraction, and sigmoid.

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once you've done all that by hand (not with python), you can then write a python statement that calculates it.

wild scroll
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so like

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solver it first

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okay

weary charmBOT
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