Hi everyone,

I just learned about Gradient Descent for logistic regression and i’m confusing about the derivative of w[j]. Althought i knew the different between gradient descent for linear regression and logistic regression was definition of f_wb(x), i can’t understand why there is still x[j] when we update w[j]. The definition of f_wb(x) has been changed there so i wonder why x[j] still there

i tried some math operator to prove it but i didnt get correct answer.

I will very happy if i know the answer for this.

Regard.