code: def setup_mutator_registry():
      """
      Loads the mutators so that @register_mutator is hit for all.
      """
      global MUTATOR_REGISTRY
      if hasattr(setup_mutator_registry, "loaded"):
          return
      for module in pkgutil.iter_modules(
          parlai.mutators.__path__, "parlai.mutators."
      ):
          importlib.import_module(module.name)
      try:
          import parlai_fb.mutators
  
          for module in pkgutil.iter_modules(
              parlai_fb.mutators.__path__, "parlai_fb.mutators."
          ):
              importlib.import_module(module.name)
      except ImportError:
          pass
      try:
          import parlai_internal.mutators
  
          for module in pkgutil.iter_modules(
              parlai_internal.mutators.__path__,
              "parlai_internal.mutators.",
          ):
              importlib.import_module(module.name)
      except ImportError:
          pass
      setup_mutator_registry.loaded = True
      return MUTATOR_REGISTRY
  
imports: from __future__ import annotations
  import abc
  import importlib
  import pkgutil
  from typing import Optional, Iterable, Tuple, List, Iterator, Callable, Type
  import parlai.mutators
  from parlai.core.params import ParlaiParser
  from parlai.core.opt import Opt
  from parlai.core.message import Message
label_desc: Use image node_id 1 for calling a global function with example usage: setup_mutator_registry() and returns: MUTATOR_REGISTRY