What does the slice(lr) mean in fit_one_cycle()

Part 1 (2019)
3

thanks @immarried when you say the former, do you mean use slice(lr)?
the latter, do you mean using slice(min_lr, max_lr)?

New to the AI and Python world, missing a lot of concept.

E,g, layer_groups, is it epoch?

What is the syntax of

  1. method(): return lr? => isinstace(ir,slice): return lr
  2. if lr.start: res = xxxx