code: def test_model_from_pretrained(self):
      model = BertGenerationEncoder.from_pretrained(
          "google/bert_for_seq_generation_L-24_bbc_encoder"
      )
      self.assertIsNotNone(model)
  
imports: import unittest
  from transformers import BertGenerationConfig, is_torch_available
  from transformers.testing_utils import require_torch, slow, torch_device
  from ...generation.test_generation_utils import GenerationTesterMixin
  from ...test_configuration_common import ConfigTester
  from ...test_modeling_common import ModelTesterMixin, floats_tensor, ids_tensor, random_attention_mask
label_desc: Use image node_id 9 for calling the BertGenerationEncoderTest obj's underlying member method code with example usage: obj.test_model_from_pretrained() without return types