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I am reading the following link : http://blog.manfredas.com/backpropagation-tutorial/ for understanding the derivation of the back propogation algorithm.
In the step for computing the partial derivative of E with respect to w vector, in step 2, the author has directly replaced hw(xi)-yi as sigmoid(xi.w) in the next step.
How are the two equal?
The derivative wrt to y_i is 0 because it is constant wrt w and in this case the hypothesis h must be the inner product of the weight and input x passed through a sigmoid.
