code: def download_file(
      source,
      dest,
      unpack=False,
      dest_unpack=None,
      replace_existing=False,
      write_permissions=False,
  ):
      """Downloads the file from the given source and saves it in the given
      destination path.
  
       Arguments
      ---------
      source : path or url
          Path of the source file. If the source is an URL, it downloads it from
          the web.
      dest : path
          Destination path.
      unpack : bool
          If True, it unpacks the data in the dest folder.
      dest_unpack: path
          Path where to store the unpacked dataset
      replace_existing : bool
          If True, replaces the existing files.
      write_permissions: bool
          When set to True, all the files in the dest_unpack directory will be granted write permissions.
          This option is active only when unpack=True.
      """
      try:
          # make sure all processing reached here before main preocess create dest_dir
          sb.utils.distributed.ddp_barrier()
          if sb.utils.distributed.if_main_process():
  
              class DownloadProgressBar(tqdm.tqdm):
                  """DownloadProgressBar class."""
  
                  def update_to(self, b=1, bsize=1, tsize=None):
                      """Needed to support multigpu training."""
                      if tsize is not None:
                          self.total = tsize
                      self.update(b * bsize - self.n)
  
              # Create the destination directory if it doesn't exist
              dest_dir = pathlib.Path(dest).resolve().parent
              dest_dir.mkdir(parents=True, exist_ok=True)
              if "http" not in source:
                  shutil.copyfile(source, dest)
  
              elif not os.path.isfile(dest) or (
                  os.path.isfile(dest) and replace_existing
              ):
                  print(f"Downloading {source} to {dest}")
                  with DownloadProgressBar(
                      unit="B",
                      unit_scale=True,
                      miniters=1,
                      desc=source.split("/")[-1],
                  ) as t:
                      urllib.request.urlretrieve(
                          source, filename=dest, reporthook=t.update_to
                      )
              else:
                  print(f"{dest} exists. Skipping download")
  
              # Unpack if necessary
              if unpack:
                  if dest_unpack is None:
                      dest_unpack = os.path.dirname(dest)
                  print(f"Extracting {dest} to {dest_unpack}")
                  shutil.unpack_archive(dest, dest_unpack)
                  if write_permissions:
                      set_writing_permissions(dest_unpack)
  
      finally:
          sb.utils.distributed.ddp_barrier()
  
imports: import math
  import os
  import re
  import csv
  import shutil
  import urllib.request
  import collections.abc
  import torch
  import tqdm
  import pathlib
  import speechbrain
  from numbers import Number
label_desc: Use image node_id 7 for calling a global function with example usage: download_file(source, dest, unpack, dest_unpack, replace_existing, write_permissions) without return types