code: def get_model_file(name, root="~/.torch/models"):
      root = os.path.expanduser(root)
      file_path = os.path.join(root, name + ".pth")
      if os.path.exists(file_path):
          return file_path
      else:
          raise ValueError(
              "Model file is not found. Downloading or trainning."
          )
  
imports: import os
  import zipfile
  from .download import download, check_sha1
label_desc: Use image node_id 3 for calling a global function with example usage: get_model_file(name, root) and returns: file_path