code: def test_get_num_batches(self):
      # Lazy and instances per epoch not specified.
      assert (
          BasicIterator(batch_size=2).get_num_batches(
              self.lazy_instances
          )
          == 1
      )
      # Lazy and instances per epoch specified.
      assert (
          BasicIterator(
              batch_size=2, instances_per_epoch=21
          ).get_num_batches(self.lazy_instances)
          == 11
      )
      # Not lazy and instances per epoch specified.
      assert (
          BasicIterator(
              batch_size=2, instances_per_epoch=21
          ).get_num_batches(self.instances)
          == 11
      )
      # Not lazy and instances per epoch not specified.
      assert (
          BasicIterator(batch_size=2).get_num_batches(self.instances)
          == 3
      )
  
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 1 for calling the TestBasicIterator obj's underlying member method code with example usage: obj.test_get_num_batches() without return types