code: def visdom_connected() -> bool:
      """Returns True if the client is connected to a visdom server."""
      return (
          len(vis) > 0
          and hasattr(vis[-1], "check_connection")
          and vis[-1].check_connection()
      )
  
file_path: ClassyVision/classy_vision/generic/visualize.py
imports: import math
  from typing import Any, Callable, Dict, List, Optional, Tuple, Union
  import numpy
  import torch
  import torch.nn.modules
  from classy_vision.generic.util import get_model_dummy_input, is_pos_int
  from classy_vision.models import ClassyModel
  from PIL import Image
label_desc: Use image node_id 2 for calling a global function with example usage: visdom_connected() and returns: unknown