hello. the time lag referes to the step that we use to create the 2D shape of the input data from the 1D time-series (initial) data. E.g. if the time-series is 1,2,3,4,5,6 we can create 2 samples: 1,2,3 and 4,5,6 or 3 samples: 1,2 / 3,4 / 5,6 . Hope this helps