Passing explicit pretrained_backbone (#74372)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/74372
In preparation to the multi-weight support porting, we pass explicitly the pretrained_blackbone value. We use the default value `True` for most cases, except for when the use-case is clearly a test and thus should avoid downloading the weights of the backbone.
Test Plan: running project unit-tests
Reviewed By: jdsgomes
Differential Revision: D34961147
fbshipit-source-id: cf29e42545302716a7cd3f3eb0d69e44d5fb6c73
(cherry picked from commit c4613b7abacd106d097de1b73b13af92132e1739)
