A list of open questions and possibly ambiguous stuff encountered throughout the material.

TODO: Tag exam-related ones appropriately, to differentiate them from (exclusively) curiosity-related ones.

**Note:** An alternative design would consist of adding a questions section to every notebook, tagging it appropriately using IPython metadata, and then using something like a Python/shell script to print all open questions in a centralized way. However...

- When transitioning from the first SVM formulation (with slack variables), to the second one aren't we loosening any constraint by fixing $\xi$?
- (tentative) It seems we're not, since we're taking multiple cases into consideration and merging them together into a single formulation using max.

- Slide 04:18: Is the first (primal) SVM formulation a (ii)-type one (since it has a minimization and its constraint as separate equation), or is it not eligible for this categorization?
- Slide 06:15: How do we go from step 1 to 2? Isn't the $\lambda \| w \|_2^2$ term outside the sum?
- yes it is, but the sum has a convenient $\frac{1}{T}$ in front of it, so we're safe to add the regularization term into the sum.

- Why do some SVM OCP implementations
*always*regularize, even when the model was not updated at that stage.

- How exactly is the Lagrangian dual reformulation step (SVMs) different from the first time we reformulated the SVM problem statement to get rid of the slack variables?
- it's different because we changed the objective! We no longer have $\min_w$ or $\min_{w, \xi}$, it's now a maximization of the Lagrance coefficients: $\max_\alpha$; it's not a
*reformulation*, but an*equivalent problem*

- it's different because we changed the objective! We no longer have $\min_w$ or $\min_{w, \xi}$, it's now a maximization of the Lagrance coefficients: $\max_\alpha$; it's not a

- Homework 5 solution, 2.2: Why is:

- And why doe we still have the $i$ subscript in the variance formulation? Can't we just write $x \tilde{} q$?
- Have to discuss this with friends!

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