combinations of edges to form higher level features so let me show an example that this is an example run by Hall actually it's not a michigan professor but what huh laughs did was she trained one air of virtuous paws dbn and first layer you know Avram mercy group together pixels for mages another level up learn significant edges to form models of object parts right so this I should say this was an example of sparse coding train just on pictures of faces so the entire dataset was pictures of faces right and then I'm requesting you apply