code: def get_pb_arg_valstrings(pb, arg_name, default_val):
      arg = get_pb_arg(pb, arg_name)
      return list(arg.strings) if arg is not None else default_val
  
imports: import collections
  import copy
  import functools
  import logging
  import numpy
  import os
  from typing import Any, Callable, Dict, List, Optional, Tuple, Union
  from unittest import mock
  import caffe2.python.utils
  import torch
  import torch.nn.functional
  from caffe2.proto import caffe2_pb2
  from caffe2.python import core, net_drawer, workspace
  from torch.nn.functional import interpolate
label_desc: Use image node_id 12 for calling a global function with example usage: get_pb_arg_valstrings(pb, arg_name, default_val) and returns: unknown