code: def download_data(self, source_url, out_dir):
      shell_cmd = "cp " + self.source_url + "/meta " + self.meta_file
      os.system(shell_cmd)
  
file_path: euler/tf_euler/python/dataset/test_data.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import json
  from tf_euler.python.dataset.base_dataset import DataSet
label_desc: Use image node_id 2 for calling the test_data obj's underlying member method code with example usage: obj.download_data(source_url, out_dir) without return types