Quiz
1.
Suppose you have trained an SVM classifier with a Gaussian kernel, and it learned the following decision boundary on the training set:
You suspect that the SVM is underfitting your dataset. Should you try increasing or decreasing C? Increasing or decreasing σ2?
- It would be reasonable to try decreasing C. It would also be reasonable to try decreasing σ2.
- It would be reasonable to try decreasing C. It would also be reasonable to try increasing σ2.
- It would be reasonable to try increasing C. It would also be reasonable to try increasing σ2.
- (CHECKED) It would be reasonable to try increasing C. It would also be reasonable to try decreasing σ2.
2.
The formula for the Gaussian kernel is given by similarity(x,l(1))=exp(−||x−l(1)||22σ2) .
The figure below shows a plot of f1=similarity(x,l(1)) when σ2=1.
Which of the following is a plot of f1 when