Question $3$

$($a$)$ What is model selection? Which approach is used for model selection? Illustrate it with the

help of SVM$.$

$($b$)$ Consider the problem of brain tumor detection from CT scanes. An SVM algorithm is

designed for this problem. How will the algorithm be evaluated using K$-$fold cross$-$

validation?

$($c$)$ Consider the problem of recognizing two types of emotions $($happy$,$ sad$)$ from tweets. An

algorithm predicts $80$ tweets as happy and $20$ as sad out of $100$ happy tweets. In addition, it

predicts $70$ tweets as sad and $30$ as happy out of $100$ sad tweets.

Compute the performance of the algorithm in terms of:

i$.$ Confusion matrix

ii$.$ Recall

iii. Precision

iv$.$ Cohen Kappa

$($d$)$ Illustrate how equal error rate $($EER$)$ is computed.