code: def open_pickle_dataset_writer(
      path, protocol=pickle.HIGHEST_PROTOCOL
  ):
      """Opens a writer to make a PickleDataset.
  
      This is a helper function to open :class:`PickleDatasetWriter`. It opens a
      given file in binary mode and creates a :class:`PickleDatasetWriter`
      instance.
  
      This method does not close the opened file. A user needs to call
      :func:`PickleDatasetWriter.close` or use `with`:
  
      .. code-block:: python
  
          with chainer.datasets.open_pickle_dataset_writer('path') as writer:
              pass  # use writer
  
      Args:
          path (str): Path to a dataset.
          protocol (int): Valid protocol for :mod:`pickle`.
  
      Returns:
          chainer.datasets.PickleDatasetWriter: Opened writer.
  
      .. seealso: chainer.datasets.PickleDataset
  
      """
      writer = open(path, "wb")
      return PickleDatasetWriter(writer, protocol=protocol)
  
imports: import io
  import multiprocessing.util
  import threading
  import six
  import six.moves.cPickle
  from chainer.dataset import dataset_mixin
label_desc: Use image node_id 2 for calling a global function with example usage: open_pickle_dataset_writer(path, protocol) and returns: PickleDatasetWriter