code: def test_gpt2_sample(self):
      tokenizer = GPT2Tokenizer.from_pretrained("gpt2")
      model = GPT2LMHeadModel.from_pretrained("gpt2")
      model.to(torch_device)
  
      torch.manual_seed(0)
      tokenized = tokenizer(
          "Today is a nice day and",
          return_tensors="pt",
          return_token_type_ids=True,
      )
      input_ids = tokenized.input_ids.to(torch_device)
      output_ids = model.generate(input_ids, do_sample=True)
      output_str = tokenizer.decode(
          output_ids[0], skip_special_tokens=True
      )
  
      token_type_ids = tokenized.token_type_ids.to(torch_device)
      output_seq = model.generate(
          input_ids=input_ids, do_sample=True, num_return_sequences=5
      )
      output_seq_tt = model.generate(
          input_ids=input_ids,
          token_type_ids=token_type_ids,
          do_sample=True,
          num_return_sequences=5,
      )
      output_seq_strs = tokenizer.batch_decode(
          output_seq, skip_special_tokens=True
      )
      output_seq_tt_strs = tokenizer.batch_decode(
          output_seq_tt, skip_special_tokens=True
      )
  
      EXPECTED_OUTPUT_STR = "Today is a nice day and if you don't know anything about the state of play during your holiday"
      self.assertEqual(output_str, EXPECTED_OUTPUT_STR)
      self.assertTrue(
          all(
              output_seq_strs[idx] != output_seq_tt_strs[idx]
              for idx in range(len(output_seq_tt_strs))
          )
      )
  
imports: import datetime
  import gc
  import math
  import unittest
  from transformers import GPT2Config, is_torch_available
  from transformers.testing_utils import backend_empty_cache, require_torch, slow, torch_device
  from ...generation.test_utils import GenerationTesterMixin
  from ...test_configuration_common import ConfigTester
  from ...test_modeling_common import ModelTesterMixin, floats_tensor, ids_tensor, random_attention_mask
  from ...test_pipeline_mixin import PipelineTesterMixin
label_desc: Use image node_id 7 for calling the GPT2ModelLanguageGenerationTest obj's underlying member method code with example usage: obj.test_gpt2_sample() without return types