code: def _get_data(url, dirname):
      import os, tarfile
  
      download(url, dirname=dirname, overwrite=False)
      fname = os.path.join(dirname, url.split("/")[-1])
      tar = tarfile.open(fname)
      source_images = [
          os.path.join(dirname, x.name)
          for x in tar.getmembers()
          if x.isfile()
      ]
      if len(source_images) < 1 or not os.path.isfile(source_images[0]):
          # skip extracting if exists
          tar.extractall(path=dirname)
      tar.close()
      return source_images
  
imports: import os
  import mxnet
  import numpy
  import scipy.ndimage
  from mxnet.test_utils import *
  from common import xfail_when_nonstandard_decimal_separator
  import shutil
  import tempfile
  import unittest
  import pytest
label_desc: Use image node_id 1 for calling a global function with example usage: _get_data(url, dirname) and returns: source_images