I don’t understand why Andrew removed the summation from the first step for wj to the second step, can anyone explain?
for the first question mark, should it be 1? as we are take derivative w.r.t w2, so w2 becomes 1? so the second question mark would be 1?
Great, then I think the following won’t be a problem for you:
You must have recognized that both the left and the right hand sides are just the same equation in two different representations.
After you fill in the question marks with the right answers, you will have answered your question with the case that n=3.
Cheers,
Raymond
so the first question mark would be 2w2, so the second question mark would also be 2w2 then, hmm so I guess if we generalize this, for that would be 2*wi ? so that’s why the summation is gone right?
Yes, this is how you have proved that the summation sign is gone.
Cheers.