[torch] Set `nproc_per_node` to 1 (#61552)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/61552
Set `nproc_per_node` to 1
Test Plan: unittests
Reviewed By: cbalioglu
Differential Revision: D29667056
fbshipit-source-id: 6601f66fec5e018c7737d909f8c71642451abb29
