code: def test_model_can_train_save_and_load(self):
      self.ensure_model_can_train_save_and_load(
          self.param_file, tolerance=1e-4
      )
  
imports: from __future__ import with_statement
  from __future__ import division
  from __future__ import absolute_import
  from flaky import flaky
  import pytest
  import numpy
  from numpy.testing import assert_almost_equal
  import torch
  from allennlp.common import Params
  from allennlp.common.checks import ConfigurationError
  from allennlp.common.testing import ModelTestCase
  from allennlp.data import DatasetReader, Vocabulary
  from allennlp.data.dataset import Batch
  from allennlp.models import BidirectionalAttentionFlow, Model
label_desc: Use image node_id 3 for calling the BidirectionalAttentionFlowTest obj's underlying member method code with example usage: obj.test_model_can_train_save_and_load() without return types