code: def cached_path(url_or_filename, cache_dir=None):
      """
      Given something that might be a URL (or might be a local path),
      determine which. If it's a URL, download the file and cache it, and
      return the path to the cached file. If it's already a local path,
      make sure the file exists and then return the path.
      """
      if cache_dir is None:
          cache_dir = DATASET_CACHE
      url_or_filename = str(url_or_filename)
  
      parsed = urlparse(url_or_filename)
  
      if parsed.scheme in ("http", "https", "s3"):
          # URL, so get it from the cache (downloading if necessary)
          return get_from_cache(url_or_filename, cache_dir)
      elif os.path.exists(url_or_filename):
          # File, and it exists.
          return url_or_filename
      elif parsed.scheme == "":
          # File, but it doesn't exist.
          raise FileNotFoundError(
              "file {} not found".format(url_or_filename)
          )
      else:
          # Something unknown
          raise ValueError(
              "unable to parse {} as a URL or as a local path".format(
                  url_or_filename
              )
          )
  
imports: from __future__ import with_statement
  from __future__ import division
  from __future__ import absolute_import
  from builtins import str
  import os
  import logging
  import shutil
  import tempfile
  import json
  import tempfile
  from hashlib import sha256
  from functools import wraps
  import boto3
  from botocore.exceptions import ClientError
  import requests
  from allennlp.common.tqdm import Tqdm
  from io import open
label_desc: Use image node_id 3 for calling a global function with example usage: cached_path(url_or_filename, cache_dir) and returns: get_from_cache, url_or_filename