machine learning

(2) (5 Points) Suppose you have a dataset of images of digits, and you use it to build a linear classifier for classifying the images into the corresponding digits. Which of the following actions may reduce the variance of your classifier? Justify your answer. (a) Collect more training data. (b) Switch to a kernel classifier with a quadratic kernel (that is, where K(x, z) = (x,z)2)