Use of fit_one_cycle

I want to train using circle lr, set cycle_len=7, 50 epochs for one cycle, and using lr from 0.001 to 0.00001 eyery cycle. Every change the new lr is lr*0.5.

If I set

for a in range(7):
fit_one_cycle(50, max_lr=slice[0.001,0.00001], wd=0.5)

Is this right?