#1




Ques 1618 How to find Ein?
Sorry if my question is naive, but how do I find Ein for regular RBF? I got the weight vector w (of length k+1), but what do I do with it? I know I am missing something simple, but I just can't figure this out. Thanks for any help in advance!

#2




Re: Ques 1719 How to find Ein?
Quote:
__________________
Where everyone thinks alike, no one thinks very much 
#3




Re: Ques 1719 How to find Ein?
Thanks, I understand that. But do you mean to apply the weights to each input according to the formula given on slide 14 of lecture 16? I think that since that formula was used to derive the weights (using phi), the weights would always satisfy it and the Ein will always be 0. Maybe this doesbn't make too much sene, but I am a little muddled up here.

#4




Re: Ques 1719 How to find Ein?
Please see slide 19 of lecture 16 which shows h(x) for regular rbf with the bias b (not part of the summation, b is w0).

#5




Re: Ques 1719 How to find Ein?
Thanks, I got it!

#6




Re: Ques 1719 How to find Ein?
OK, I am a little confused. The RBF description does not mention a bias, but then it is introduced in slide 19 of lecture 16... how do we learn the bias?

#7




Re: Ques 1719 How to find Ein?
Quote:
__________________
Where everyone thinks alike, no one thinks very much 
#8




Re: Ques 1719 How to find Ein?
Thanks! I implemented this for the pseudoinverse calculation, and also in the bias in the final calculation of h. What surprised me was that the Ein got slightly worse rather than better, which is not what I expected. Or do I have an implementation issue?

#9




Re: Ques 1719 How to find Ein?
Insample error should not go up with the added parameter (outofsample error might), so I suspect a bug of some sort.
__________________
Where everyone thinks alike, no one thinks very much 
Thread Tools  
Display Modes  

