pytorch

b0aaefb5 - Build example_allreduce only for GLOO (#81062)

Build example_allreduce only for GLOO (#81062) `example/allreduce.cpp` is GLOO-specific and will not compile with USE_GLOO=0 Pull Request resolved: https://github.com/pytorch/pytorch/pull/81062 Approved by: https://github.com/malfet