Skip installing pytorch nightly. (#1607)
Summary:
After we deploy the torchbench nightly docker, we do not need to install pytorch nightly.
Docker packages are available at: https://github.com/orgs/pytorch/packages/container/package/torchbench
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1607
Reviewed By: aaronenyeshi
Differential Revision: D45470524
Pulled By: xuzhao9
fbshipit-source-id: b3aeceafed21be61d9e048dbc166cbaff05cb505
