Machine learning approaches are historically divided into three wide categories, which correspond to learning paradigms, depending on the mother nature on the "signal" or "feed-back" available to the learning procedure: By the early 1960s an experimental "learning machine" with punched tape memory, termed Cybertron, had been made by Raytheon Corporation https://machine-learning35790.bleepblogs.com/25165751/detailed-notes-on-machine-learning-autonomous-vehicles