class_docstr: Class for tracking options.
  
  Functions like a dict, but allows us to track the history of arguments as they are
  set.
class_docstr_tok: ["Class","for","tracking","options",".","Functions","like","a","dict",",","but","allows","us","to","track","the","history","of","arguments","as","they","are","set","."]
docstr: Display all deepcopies.
docstr_tok: ["Display","all","deepcopies","."]
code: def display_deepcopies(self):
      """
      Display all deepcopies.
      """
      if len(self.deepcopies) == 0:
          return "No deepcopies performed on this opt."
      return "\n".join(
          f"{i}. {loc}" for i, loc in enumerate(self.deepcopies, 1)
      )
  
imports: from __future__ import annotations
  import copy
  import json
  import pickle
  import traceback
  import os
  import pkg_resources
  import parlai.utils.logging
  from typing import List
  from parlai.utils.io import PathManager
label_desc: Use image node_id 7 for calling the Opt obj's underlying member method code with example usage: obj.display_deepcopies() and returns: str, str