code: def test_non_atomic_write(self):
      checkpoint_filename = os.path.join(
          self.temp_dir_obj.name, "my_checkpoint.ckpt"
      )
      train_gen = some_data_generator(ModelCheckpointTest.batch_size)
      valid_gen = some_data_generator(ModelCheckpointTest.batch_size)
      checkpointer = ModelCheckpoint(
          checkpoint_filename,
          monitor="val_loss",
          verbose=True,
          period=1,
          atomic_write=False,
      )
      self.model.fit_generator(
          train_gen,
          valid_gen,
          epochs=10,
          steps_per_epoch=5,
          callbacks=[checkpointer],
      )
      self.assertTrue(os.path.isfile(checkpoint_filename))
  
imports: import os
  import unittest
  from tempfile import TemporaryDirectory
  from unittest import TestCase
  import torch
  import torch.nn
  from poutyne import Model, ModelCheckpoint, torch_to_numpy
  from tests.framework.tools import some_data_generator
label_desc: Use image node_id 6 for calling the ModelCheckpointTest obj's underlying member method code with example usage: obj.test_non_atomic_write() without return types