performs the rendezvous with an underlying process group
        initialized using "init_method = "env://"", meaning that
        environment variables "MASTER_ADDR" and "MASTER_PORT" need to
        be set properly. See Backends for more information and find
        which options are available.
The following APIs allow users to remotely execute functions as well
as create references (RRefs) to remote data objects. In these APIs,
when passing a "Tensor" as an argument or a return value, the
destination worker will try to create a "Tensor" with the same meta
(i.e., shape, stride, etc.). We intentionally disallow transmitting
CUDA tensors because it might crash if the device lists on source and
destination workers do not match. In such cases, applications can
always explicitly move the input tensors to CPU on the caller and move
it to the desired devices on the callee if necessary.
Warning:
TorchScript support in RPC is a prototype feature and subject to