code: def prepare_UCF11_data():
      base_path = os.path.join(
          os.path.dirname(os.path.abspath(__file__)),
          *"../../../../Examples/Video/DataSets/UCF11".split("/"),
      )
      base_path = os.path.normpath(base_path)
      if not os.path.isfile(os.path.join(base_path, "test_map.csv")):
          # extract from backup location
          tar_path = os.path.join(
              os.environ["CNTK_EXTERNAL_TESTDATA_SOURCE_DIRECTORY"],
              *"DataSets/UCF11-v0.tar".split("/"),
          )
          with tarfile.TarFile(tar_path) as mytar:
              mytar.extractall(base_path)
  
file_path: CNTK/Tests/EndToEndTests/CNTKv2Python/Examples/prepare_test_data.py
imports: import os
  import tarfile
  import zipfile
  from shutil import copyfile
label_desc: Use image node_id 13 for calling a global function with example usage: prepare_UCF11_data() without return types