A person in a lab coat is standing on a pile of stuff. Inside the pile are some matrices, letters, and numbers, and there's a funnel marked "data" leading into the pile. There's also a box labelled "answers" on the other side of the pile. Another person is also there.
No lab coat: This is your machine learning system?
Lab coat: Yup! You pour the data into this big pile of linear algebra, then collect the answers on the other side.
No lab coat: What if the answers are wrong?
Lab coat: Just stir the pile until they start looking right.