code: def define_flags(self, parser):
      if self._define_flags:
          self._define_flags(parser)
  
imports: import argparse
  import io
  import sys
  from unittest import mock
  from tensorboard import program
  from tensorboard import test
  from tensorboard.plugins import base_plugin
  from tensorboard.plugins.core import core_plugin
label_desc: Use image node_id 3 for calling the _TestSubcommand obj's underlying member method code with example usage: obj.define_flags(parser) without return types