code: def test_contrastive_search_opt(self):
      article = (
          "A chat between a curious human and the Statue of Liberty.\n\nHuman: What is your name?\nStatue: I am the "
          "Statue of Liberty.\nHuman: Where do you live?\nStatue: New York City.\nHuman: How long have you lived "
          "there?"
      )
  
      opt_tokenizer = GPT2Tokenizer.from_pretrained("facebook/opt-1.3b")
      opt_model = OPTForCausalLM.from_pretrained(
          "facebook/opt-1.3b"
      ).to(torch_device)
      input_ids = opt_tokenizer(
          article, return_tensors="pt"
      ).input_ids.to(torch_device)
  
      outputs = opt_model.generate(
          input_ids, penalty_alpha=0.6, top_k=5, max_length=256
      )
      generated_text = opt_tokenizer.batch_decode(
          outputs, skip_special_tokens=True
      )
  
      self.assertListEqual(
          generated_text,
          [
              "A chat between a curious human and the Statue of Liberty.\n\nHuman: What is your name?\nStatue: I "
              "am the Statue of Liberty.\nHuman: Where do you live?\nStatue: New York City.\nHuman: How long have "
              "you lived there?\nStatue: A hundred years.\nHuman: And you’re from what country?\nStatue: The United "
              "States of America.\nHuman: Why did you come to America?\nStatue: I came to escape the tyranny of my "
              "country.\nHuman: What tyranny?\nStatue: They didn’t let me speak my mind.\nHuman: What was your "
              "country?\nStatue: It was a country of immigrants.\nHuman: Who were the immigrants?\nStatue: They "
              "were from all over the world.\nHuman: What language did they speak?\nStatue: French, Spanish, "
              "Italian, German, English—you name it.\nHuman: And where did they come from?\nStatue: They came from "
              "every country in the world.\nHuman: And you were born in what country?\nStatue: I was born in "
              "France.\nHuman: And your parents were French?\nStatue"
          ],
      )
  
imports: import copy
  import tempfile
  import unittest
  import timeout_decorator
  from transformers import OPTConfig, is_torch_available
  from transformers.testing_utils import require_torch, require_torch_accelerator, require_torch_fp16, slow, torch_device
  from ...generation.test_utils import GenerationTesterMixin
  from ...test_configuration_common import ConfigTester
  from ...test_modeling_common import ModelTesterMixin, ids_tensor
  from ...test_pipeline_mixin import PipelineTesterMixin
label_desc: Use image node_id 6 for calling the OPTGenerationTest obj's underlying member method code with example usage: obj.test_contrastive_search_opt() without return types