code: def test_model_as_decoder(self):
      (
          config,
          input_ids,
          input_mask,
          token_labels,
      ) = self.model_tester.prepare_config_and_inputs_for_decoder()
      self.model_tester.create_and_check_model_as_decoder(
          config, input_ids, input_mask
      )
  
imports: import unittest
  from transformers import GPTNeoXJapaneseConfig, is_torch_available
  from transformers.models.gpt_neox_japanese.tokenization_gpt_neox_japanese import GPTNeoXJapaneseTokenizer
  from transformers.testing_utils import require_torch, slow, torch_device
  from ...test_configuration_common import ConfigTester
  from ...test_modeling_common import ModelTesterMixin, ids_tensor, random_attention_mask
label_desc: Use image node_id 4 for calling the GPTNeoXModelJapaneseTest obj's underlying member method code with example usage: obj.test_model_as_decoder() without return types