code: def _test_allgather_process(
      cls, rank, filename, shared_tensors, world_size, init_pg, c2p, p2c
  ):
      pg = init_pg(rank, filename, world_size)
      xs = [shared_tensors[rank]]
      ys = [[torch.zeros_like(xs[0]) for i in range(world_size)]]
      pg.allgather(ys, xs).wait()
      for i in range(world_size):
          c2p.put((rank, torch.ones(2, 2) * i, ys[0][i].to("cpu")))
  
      p2c.get()
  
imports: import os
  import sys
  import tempfile
  import torch
  import torch.distributed
  import torch.multiprocessing
  from torch.testing._internal.common_distributed import MultiProcessTestCase
  from torch.testing._internal.common_utils import load_tests, NO_MULTIPROCESSING_SPAWN
label_desc: Use image node_id 4 for calling the AbstractProcessGroupShareTensorTest obj's underlying member method code with example usage: obj._test_allgather_process(cls, rank, filename, shared_tensors, world_size, init_pg, c2p, p2c) without return types