Duality: when is dual better than primal? (unclear)
Lectures · 61 · 1 · 11 Jan '21
Hi! I'm still confused as to which cases are better with dual or with primal. The formulation o…
Classifying with the kernel K
Lectures · 104 · 5 · 29 Dec '20
Hello! I can't understand the passages associated to the topic "Classifying with the kernel K" in l…
Question regarding kernelized ridge regression
Lectures · 66 · 1 · 28 Dec '20
Good morning, I was a bit confused by how the expression for $$\alpha^{*}$$ was obtained in the alt…
alphas in SVMs
Lectures · 89 · 2 · 27 Dec '20
Hi, I was reading over the conditions for alpha in SVM. I understand if it is correctly classifi…
Hard vs Soft Margin SVM interpretation
Lectures · 75 · 2 · 26 Dec '20
Hello, I have a doubt about the interpretation I should give to hard/soft margin SVM formulations. …
Primal formula
Lectures · 112 · 7 · 4 Nov '20
Hi, I don't understand why in the videos we've got this formula ![Screenshot from 2020-11-03 11…
Don't understand this statement: 'Note that G(w, α) is convex in w and linear, hence concave, in α'
Lectures · 93 · 5 · 31 Oct '20
I am not sure how this conclusion is drawn in the Lecture 7 SVM: "Note that G(w, α) is convex in w…
soft vs hard margin dual and alpha
Lectures · 95 · 2 · 30 Oct '20
Good Evening, I have a hard time seeing how we derive the constraints for alpha in the dual form…
Set of classifiers is not convex
Lectures · 132 · 6 · 29 Oct '20
Hello, In the first part of the first lecture (w7), when talking about the convexity of the loss…
Question on Coordinate descent
Lectures · 92 · 2 · 28 Oct '20
Hi, Why is it easy to optimize via coordinate ascent to solve dual optimization? Could you explai…
SVM soft margin
Lectures · 74 · 2 · 28 Oct '20
I was wondering if the penalization for being on the wrong side of the margin (slack variables cost…
SVM Dual problem optimisation
Lectures · 150 · 4 · 28 Oct '20
When trying to find $$max_{\alpha\in R^N} : \alpha^T1 - \frac{1}{2\lambda}\alpha YXX^TY\alpha$$…