code: def createPlugin(self, logdir):
      multiplexer = event_multiplexer.EventMultiplexer()
      multiplexer.AddRunsFromDirectory(logdir)
      multiplexer.Reload()
      provider = data_provider.MultiplexerDataProvider(
          multiplexer, logdir
      )
      plugin_name_to_instance = {}
      context = base_plugin.TBContext(
          logdir=logdir,
          data_provider=provider,
          plugin_name_to_instance=plugin_name_to_instance,
      )
      scalars_plugin_instance = scalars_plugin.ScalarsPlugin(context)
      custom_scalars_plugin_instance = (
          custom_scalars_plugin.CustomScalarsPlugin(context)
      )
      plugin_instances = [
          scalars_plugin_instance,
          custom_scalars_plugin_instance,
      ]
      for plugin_instance in plugin_instances:
          plugin_name_to_instance[
              plugin_instance.plugin_name
          ] = plugin_instance
      return custom_scalars_plugin_instance
  
imports: import csv
  import io
  import json
  import os
  import numpy
  import tensorflow
  from werkzeug import test
  from werkzeug import wrappers
  from google.protobuf import json_format
  from tensorboard.backend import application
  from tensorboard import context
  from tensorboard.backend.event_processing import data_provider
  from tensorboard.backend.event_processing import plugin_event_multiplexer
  from tensorboard.plugins import base_plugin
  from tensorboard.plugins.custom_scalar import custom_scalars_plugin
  from tensorboard.plugins.custom_scalar import layout_pb2
  from tensorboard.plugins.custom_scalar import summary
  from tensorboard.plugins.scalar import scalars_plugin
  from tensorboard.plugins.scalar import summary
  from tensorboard.util import test_util
label_desc: Use image node_id 2 for calling the CustomScalarsPluginTest obj's underlying member method code with example usage: obj.createPlugin(logdir) and returns: custom_scalars_plugin_instance