Revert D23725053: [pytorch][PR] change self.generator to generator
Test Plan: revert-hammer
Differential Revision:
D23725053 (https://github.com/pytorch/pytorch/commit/a011b86115541365ebd55598f85ff9a42a6875d8)
Original commit changeset: 89706313013d
fbshipit-source-id: 035214f0d4298d29a52f8032d364b52dfd956fe8
