fix base_lr overridden in cyclic lr (#26105)
Summary:
base_lr parameter was being overridden by super `__init__`, see https://github.com/pytorch/pytorch/issues/21965.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/26105
Reviewed By: yf225
Differential Revision: D17346724
Pulled By: vincentqb
fbshipit-source-id: 4b146bd64f4f385c0a9c4f4df8eb8991312fb15c
