class_docstr: This class tests all member functions of crypten package
code: def test_batched_all_reduce(self) -> None:
      sizes = [(), (1,), (5,), (5, 5), (5, 5, 5)]
      tensors = [get_random_test_tensor(size=size) for size in sizes]
  
      results = comm.get().all_reduce(tensors, batched=True)
      self.assertTrue(isinstance(results, list))
      for i, result in enumerate(results):
          self.assertTrue(
              (result == (tensors[i] * self.world_size)).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 13 for calling the TestCommunicator obj's underlying member method code with example usage: obj.test_batched_all_reduce() without return types