Remove finput from slow2d signatures (#68896)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/68896
Test Plan: Imported from OSS
Reviewed By: zou3519
Differential Revision: D32655874
Pulled By: jbschlosser
fbshipit-source-id: 3c9acb106961c40af1432652179edb2bc5a4bfa5
