code: def assert_instances_are_correct(self, candidate_instances):
      # First we need to remove padding tokens from the candidates.
  
      candidate_instances = [
          tuple(w for w in instance if w != 0)
          for instance in candidate_instances
      ]
      expected_instances = [
          tuple(
              instance.fields["text"]._indexed_tokens["tokens"][
                  "tokens"
              ]
          )
          for instance in self.instances
      ]
      assert set(candidate_instances) == set(expected_instances)
  
file_path: allennlp/tests/data/samplers/sampler_test.py
imports: from typing import List, Iterable, Dict, Union
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data import Vocabulary, Instance, Token, Batch, DatasetReader
  from allennlp.data.fields import TextField
  from allennlp.data.token_indexers import SingleIdTokenIndexer
label_desc: Use image node_id 6 for calling the SamplerTest obj's underlying member method code with example usage: obj.assert_instances_are_correct(candidate_instances) without return types