code: def cache_url(
      url_or_file, cache_dir, base_url=_PYCLS_BASE_URL, download=True
  ):
      """Download the file specified by the URL to the cache_dir and return the path to
      the cached file. If the argument is not a URL, simply return it as is.
      """
      is_url = (
          re.match(r"^(?:http)s?://", url_or_file, re.IGNORECASE)
          is not None
      )
      if not is_url:
          return url_or_file
      url = url_or_file
      assert url.startswith(base_url), "url must start with: {}".format(
          base_url
      )
      cache_file_path = url.replace(base_url, cache_dir)
      if pathmgr.exists(cache_file_path):
          return cache_file_path
      cache_file_dir = os.path.dirname(cache_file_path)
      if not pathmgr.exists(cache_file_dir):
          pathmgr.mkdirs(cache_file_dir)
      if download:
          logger.info(
              "Downloading remote file {} to {}".format(
                  url, cache_file_path
              )
          )
          download_url(url, cache_file_path)
      return cache_file_path
  
file_path: pycls/pycls/core/io.py
imports: import logging
  import os
  import re
  import sys
  from urllib import request
  from iopath.common.file_io import PathManagerFactory
label_desc: Use image node_id 1 for calling a global function with example usage: cache_url(url_or_file, cache_dir, base_url, download) and returns: cache_file_path, url_or_file, cache_file_path