code: def download(
      url,
      path=None,
      overwrite=True,
      sha1_hash=None,
      retries=5,
      verify_ssl=True,
      log=True,
  ):
      """Download a given URL.
  
      Codes borrowed from mxnet/gluon/utils.py
  
      Parameters
      ----------
      url : str
          URL to download.
      path : str, optional
          Destination path to store downloaded file. By default stores to the
          current directory with the same name as in url.
      overwrite : bool, optional
          Whether to overwrite the destination file if it already exists.
          By default always overwrites the downloaded file.
      sha1_hash : str, optional
          Expected sha1 hash in hexadecimal digits. Will ignore existing file when hash is specified
          but doesn't match.
      retries : integer, default 5
          The number of times to attempt downloading in case of failure or non 200 return codes.
      verify_ssl : bool, default True
          Verify SSL certificates.
      log : bool, default True
          Whether to print the progress for download
  
      Returns
      -------
      str
          The file path of the downloaded file.
      """
      if path is None:
          fname = url.split("/")[-1]
          # Empty filenames are invalid
          assert fname, (
              "Can't construct file-name from this URL. "
              "Please set the `path` option manually."
          )
      else:
          path = os.path.expanduser(path)
          if os.path.isdir(path):
              fname = os.path.join(path, url.split("/")[-1])
          else:
              fname = path
      assert retries >= 0, "Number of retries should be at least 0"
  
      if not verify_ssl:
          warnings.warn(
              "Unverified HTTPS request is being made (verify_ssl=False). "
              "Adding certificate verification is strongly advised."
          )
  
      if (
          overwrite
          or not os.path.exists(fname)
          or (sha1_hash and not check_sha1(fname, sha1_hash))
      ):
          dirname = os.path.dirname(
              os.path.abspath(os.path.expanduser(fname))
          )
          if not os.path.exists(dirname):
              os.makedirs(dirname)
          while retries + 1 > 0:
              # Disable pyling too broad Exception
              # pylint: disable=W0703
              try:
                  if log:
                      print("Downloading %s from %s..." % (fname, url))
                  r = requests.get(url, stream=True, verify=verify_ssl)
                  if r.status_code != 200:
                      raise RuntimeError(
                          "Failed downloading url %s" % url
                      )
                  # Get the total file size.
                  total_size = int(r.headers.get("content-length", 0))
                  with tqdm(
                      total=total_size,
                      unit="B",
                      unit_scale=True,
                      desc=fname,
                  ) as bar:
                      with open(fname, "wb") as f:
                          for chunk in r.iter_content(chunk_size=1024):
                              if (
                                  chunk
                              ):  # filter out keep-alive new chunks
                                  f.write(chunk)
                                  bar.update(len(chunk))
                  if sha1_hash and not check_sha1(fname, sha1_hash):
                      raise UserWarning(
                          "File {} is downloaded but the content hash does not match."
                          " The repo may be outdated or download may be incomplete. "
                          'If the "repo_url" is overridden, consider switching to '
                          "the default repo.".format(fname)
                      )
                  break
              except Exception as e:
                  retries -= 1
                  if retries <= 0:
                      raise e
                  else:
                      if log:
                          print(
                              "download failed, retrying, {} attempt{} left".format(
                                  retries, "s" if retries > 1 else ""
                              )
                          )
  
      return fname
  
imports: from __future__ import absolute_import
  import errno
  import hashlib
  import os
  import pickle
  import sys
  import warnings
  import networkx.algorithms
  import numpy
  import requests
  from tqdm import tqdm
  from ..None import backend
  from .graph_serialize import load_graphs, load_labels, save_graphs
  from .tensor_serialize import load_tensors, save_tensors
label_desc: Use image node_id 4 for calling a global function with example usage: download(url, path, overwrite, sha1_hash, retries, verify_ssl, log) and returns: fname