code: def test_contrastive_search_gptj(self):
      article = (
          "DeepMind Technologies is a British artificial intelligence subsidiary of Alphabet Inc. and "
          "research laboratory founded in 2010. DeepMind was acquired by Google in 2014. The company is based"
      )
  
      tokenizer = AutoTokenizer.from_pretrained("EleutherAI/gpt-j-6B")
      model = GPTJForCausalLM.from_pretrained(
          "EleutherAI/gpt-j-6B",
          revision="float16",
          torch_dtype=torch.float16,
      ).to(torch_device)
      input_ids = tokenizer(article, return_tensors="pt").input_ids.to(
          torch_device
      )
  
      outputs = model.generate(
          input_ids, penalty_alpha=0.6, top_k=4, max_length=256
      )
      generated_text = tokenizer.batch_decode(
          outputs, skip_special_tokens=True
      )
  
      self.assertListEqual(
          generated_text,
          [
              "DeepMind Technologies is a British artificial intelligence subsidiary of Alphabet Inc. and research "
              "laboratory founded in 2010. DeepMind was acquired by Google in 2014. The company is based in London, "
              "United Kingdom with offices in Mountain View, San Francisco, New York City, Paris, Tokyo, Seoul, "
              "Beijing, Singapore, Tel Aviv, Dublin, Sydney, and Melbourne.[1]\n\nContents\n\nIn 2010, Google's "
              "parent company, Alphabet, announced a $500 million investment in DeepMind, with the aim of creating "
              "a company that would apply deep learning to problems in healthcare, energy, transportation, and "
              "other areas.[2]\n\nOn April 23, 2014, Google announced that it had acquired DeepMind for $400 "
              "million in cash and stock.[3] The acquisition was seen as a way for Google to enter the "
              "fast-growing field of artificial intelligence (AI), which it had so far avoided due to concerns "
              'about ethical and social implications.[4] Google co-founder Sergey Brin said that he was "thrilled" '
              'to have acquired DeepMind, and that it would "help us push the boundaries of AI even further."'
              "[5]\n\nDeepMind's founders, Demis Hassabis and Mustafa Suleyman, were joined by a number of Google "
              "employees"
          ],
      )
  
imports: import datetime
  import unittest
  from transformers import GPTJConfig, is_torch_available
  from transformers.testing_utils import require_torch, slow, tooslow, 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 4 for calling the GPTJModelLanguageGenerationTest obj's underlying member method code with example usage: obj.test_contrastive_search_gptj() without return types