code: def _make_loader(self, **kwargs):
      return self._loader_class(self._get_filename(), **kwargs)
  
imports: import abc
  import io
  import os
  import unittest
  from unittest import mock
  from tensorboard import test
  from tensorboard.backend.event_processing import event_file_loader
  from tensorboard.compat import tf
  from tensorboard.compat.proto import event_pb2
  from tensorboard.summary.writer import record_writer
label_desc: Use image node_id 3 for calling the EventFileLoaderTestBase obj's underlying member method code with example usage: obj._make_loader() and returns: self