Fixed typo in HW6.
Fixed typo in HW6.

Changed $\mathbf{x}$ to $\beta$ in regularization term in Ridge regression.

crystalzhaizhai/cs207_yi_zhai,IACS-CS-207/cs207-F17,crystalzhaizhai/cs207_yi_zhai,IACS-CS-207/cs207-F17