code: def _ensure_tensorboard(self):
      if self._tb_mod is None:
          from guild import tensorboard
  
          self._tb_mod = tensorboard
      return self._tb_mod
  
imports: import json
  import logging
  import math
  import os
  import socket
  import subprocess
  import sys
  import threading
  import time
  from werkzeug.exceptions import NotFound
  from werkzeug.utils import redirect
  from guild import serving_util
  from guild import util
  from guild import var
label_desc: Use image node_id 6 for calling the TBServers obj's underlying member method code with example usage: obj._ensure_tensorboard() and returns: self