Added complex datatype support to sigmoid on cuda (#55975)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/55359
Pull Request resolved: https://github.com/pytorch/pytorch/pull/55975
Reviewed By: ezyang
Differential Revision: D27770438
Pulled By: prabhat00155
fbshipit-source-id: 730193950805ce28d8672104fe446a647194e8cb
