code: def test_plugins_export_pb_functions(self):
      for plugin in self.plugins:
          self.assertIsInstance(
              getattr(self.module, "%s_pb" % plugin),
              collections.abc.Callable,
          )
  
imports: import collections.abc
  import sys
  import unittest
  import tensorboard.summary
  import tensorboard.summary.v1
  import tensorboard.summary.v2
label_desc: Use image node_id 2 for calling the SummaryExportsBaseTest obj's underlying member method code with example usage: obj.test_plugins_export_pb_functions() without return types