lr_config set up according to max iter?

[vefak]

How should I set lr_config parameters according to max_iter? Now I want to perform only 20k steps as max iteration what should lr_config will be?

` lr_config = dict(step=[120000 * 4, 160000 * 4])

runner = dict(delete=True, type="IterBasedRunner", max_iters=12000)`