Adds a ModuleAttachment to the current graph.

  Args:
    key: A string with the unique key of the attachment.
    the_bytes: A bytes object with the serialized attachment.

def attach_bytes(key, the_bytes):
  """Adds a ModuleAttachment to the current graph.

  Args:
    key: A string with the unique key of the attachment.
    the_bytes: A bytes object with the serialized attachment.
  """
  tf_v1.add_to_collection(
      _ATTACHMENT_COLLECTION_INTERNAL,
      module_attachment_pb2.ModuleAttachment(key=key, value=the_bytes))