code: def _dim_set(positional, arg):
      def convert(a):
          if isinstance(a, Dim):
              return a
          else:
              assert isinstance(a, int)
              return positional[a]
  
      if arg is None:
          return positional
      elif not isinstance(arg, (Dim, int)):
          return tuple(convert(a) for a in arg)
      else:
          return (convert(arg),)
  
file_path: pytorch/functorch/dim/dim.py
imports: import dis
  import inspect
  from dataclasses import dataclass
  from typing import Union
  from .None import DimList
label_desc: Use image node_id 3 for calling a global function with example usage: _dim_set(positional, arg) and returns: positional, a, positional, tuple, convert