code: def test_encoder_decoder_model_standalone(self):
      config_and_inputs = (
          self.model_tester.prepare_config_and_inputs_for_common()
      )
      self.model_tester.check_encoder_decoder_model_standalone(
          *config_and_inputs
      )
  
imports: import copy
  import tempfile
  import unittest
  from transformers import PLBartConfig, is_torch_available
  from transformers.testing_utils import require_sentencepiece, require_tokenizers, require_torch, require_torch_fp16, slow, torch_device
  from transformers.utils import cached_property
  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 PLBartModelTest obj's underlying member method code with example usage: obj.test_encoder_decoder_model_standalone() without return types