code: def _model_dir(self, model):
      caffe2_home = os.path.expanduser(
          os.getenv("CAFFE2_HOME", "~/.caffe2")
      )
      models_dir = os.getenv(
          self.model_env_name, os.path.join(caffe2_home, "models")
      )
      return os.path.join(models_dir, model)
  
imports: import argparse
  import os
  import sys
  import signal
  import re
  import json
  from caffe2.proto import caffe2_pb2
  from urllib.error import HTTPError, URLError
  import urllib.request
label_desc: Use image node_id 2 for calling the ModelDownloader obj's underlying member method code with example usage: obj._model_dir(model) and returns: os