ex8 "Anomaly Detection and Recommender Systems" is done and submitted.

ex7 "K-means Clustering and PCA" is done and submitted.

ex6 "Support Vector Machines" is done and submitted.

ex5 "Regularized Linear Regression and Bias v.s. Variances" is done a…

…nd submitted.

ex4 "Neural Networks:learning" is done and submitted.

ex3 and its submit are done.

assignments of logistic regression are done and submitted.

assignments of regularization are done and submitted.

exercises which are needed to complete are completed.

refactor univariate gradient descent. confirming univariate version i…

…s simply a special case of multivariate version.