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Derivate of Neural Network respect to input
I have a neural network like this
$x=\text{input}$
$z_1=W_{1x}\cdot x+b_1$
$h_1=\text{relu}(z_1)$
$z_2=W_2\cdot h_1+W_{2x}\cdot x+b_2$
$h_2=\text{relu}(z_2)$
$y=W_3\cdot h_2+W_{3x}\cdot x+b_3$
input ...
