class_docstr: This class tests all member functions of crypten package
code: def test_all_gather_random(self) -> None:
      sizes = [(), (1,), (5,), (5, 5), (5, 5, 5)]
      for size in sizes:
          tensor = get_random_test_tensor(size=size)
          result = comm.get().all_gather(tensor)
          self.assertTrue(isinstance(result, list))
          for res in result:
              self.assertTrue((res == tensor).all())
  
imports: import unittest
  import crypten
  import crypten.communicator
  import numpy
  import torch
  import torch.distributed
  import torch.nn
  import torch.nn.functional
  from crypten.common import serial
  from crypten.config import cfg
  from test.multiprocess_test_case import get_random_test_tensor, MultiProcessTestCase
label_desc: Use image node_id 9 for calling the TestCommunicator obj's underlying member method code with example usage: obj.test_all_gather_random() without return types