better example for local weights (#21685)
Summary:
fixes https://github.com/pytorch/hub/issues/29
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21685
Differential Revision: D15817774
Pulled By: ailzhang
fbshipit-source-id: d2f615e5d431186d45a21d8300fb9ba3c37b246c
