grammar issue

modified some errors.

fix the singular matrix issue.

change 'HW' to 'task'

forgot the question number

change 'is' to 'are'

add readme, images, and some revisions.

finalizing

can't resolve the issue of scipy.mvn, give up :(

finish GMM

add k-means

add beta.

complete svm

add subplot

implement the prototype of svm