higher-level features like maybe jaw lines side of the face etc which then can be used to detect the final face structure and actually the fundamental building blocks of deep learning have existed for decades and they're under underlying algorithms for training these models have also existed for many years so why are we studying this now well for one data has become much more pervasive we're living in a the age of big data and these these algorithms are hungry for a huge amounts of data to succeed secondly these algorithms are massively