On Learning Control:The State of the Art and Perspective

In this article we review the recent advances in learning control theory.First insight is provided into the concept and principle associated with learning control under a repeatable control environment.Then a briefing is given to the two main streams of learning control-iterative learning control and repetitive control.Subsequently we survey several hot topics in the field of learning control.New trends in learning control using Lyapunov methods are also sketched,followed by remarks on future directions.