code: def test_max_instances_in_memory(self):
      # pylint: disable=protected-access
      for test_instances in (self.instances, self.lazy_instances):
          iterator = BasicIterator(
              batch_size=2, max_instances_in_memory=3
          )
          # One epoch: 5 instances -> [2, 1, 2]
          batches = list(
              iterator._create_batches(test_instances, shuffle=False)
          )
          grouped_instances = [batch.instances for batch in batches]
          assert grouped_instances == [
              [self.instances[0], self.instances[1]],
              [self.instances[2]],
              [self.instances[3], self.instances[4]],
          ]
  
imports: from __future__ import absolute_import
  from collections import Counter
  from allennlp.common import Params
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data import Instance, Token, Vocabulary
  from allennlp.data.dataset_readers.dataset_reader import _LazyInstances
  from allennlp.data.fields import TextField
  from allennlp.data.iterators import BasicIterator
  from allennlp.data.token_indexers import SingleIdTokenIndexer
label_desc: Use image node_id 8 for calling the TestBasicIterator obj's underlying member method code with example usage: obj.test_max_instances_in_memory() without return types