Proper print for one element tuple (#30853)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/30853
Right now we print one element tuple as `(val)`, and it will
be interpreted as `val` in parsing, this PR changes it
to `(val,)` so we can recognize the one element tuple in parsing
Test Plan:
.
Imported from OSS
Differential Revision: D18846849
fbshipit-source-id: 42959b9190c2567ef021a861497077c550324b7c
