code: def test_create_batches_groups_correctly(self):
      sampler = MaxTokensBatchSampler(
          max_tokens=8, padding_noise=0, sorting_keys=["text"]
      )
  
      grouped_instances = []
      for indices in sampler.get_batch_indices(self.instances):
          grouped_instances.append(
              [self.instances[idx] for idx in indices]
          )
      expected_groups = [
          [self.instances[4], self.instances[2]],
          [self.instances[0], self.instances[1]],
          [self.instances[3]],
      ]
      for group in grouped_instances:
          assert group in expected_groups
          expected_groups.remove(group)
      assert expected_groups == []
  
file_path: allennlp/tests/data/samplers/max_tokens_batch_sampler_test.py
imports: from allennlp.data import Instance, Token
  from allennlp.data.fields import TextField
  from allennlp.data.samplers import MaxTokensBatchSampler
  from allennlp.data.data_loaders import MultiProcessDataLoader
  from .sampler_test import SamplerTest
label_desc: Use image node_id 1 for calling the TestMaxTokensSampler obj's underlying member method code with example usage: obj.test_create_batches_groups_correctly() without return types