class_docstr: This class tests all member functions of crypten package
code: def test_get_rank(self) -> None:
      self.assertEqual(comm.get().get_rank(), self.rank)
  
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 12 for calling the TestCommunicator obj's underlying member method code with example usage: obj.test_get_rank() without return types