class_docstr: A way to track the calls to distributed groups
class_docstr_tok: ["A","way","to","track","the","calls","to","distributed","groups"]
code: def __init__(self, group, listener=None):
      self.group = group
      self.listener = listener
  
imports: from contextlib import contextmanager
  from dataclasses import dataclass
  from enum import auto, Enum
  from functools import lru_cache
  from typing import Dict, List, NamedTuple, Tuple, Union
  import numpy
  import torch
  import torch.nn
  from fairscale.nn import FullyShardedDataParallel
  from vissl.utils.visualize import matplotlib_figure_to_image
label_desc: Use image node_id 1 to create a new ProcessGroupTracker object  with example: obj = ProcessGroupTracker(group, listener)