docs: def get_dataset_meta(label):
      """Gives you metadata for dataset chosen via 'label' param
  
      :param label: label = key in data_url dict (that big dict containing all possible datasets)
      :return: tuple (data_url, url, expected_hash, hash_path, relative_download_dir)
      relative_download_dir says where will be downloaded the file from url and eventually unzipped
  
      """
      data_url = data_urls[label]
      if type(data_url) == str:
          # back compatibility
          data_url = [data_url]
      if type(data_url) == list:
          data_url.extend([None, None, None, None])
          data_url = data_url[:4]
          url, expected_hash, hash_path, relative_donwload_dir = data_url
          if hash_path is None:
              hash_path = label
      # elif type(data_url) == dict:
      return data_url, url, expected_hash, hash_path, relative_donwload_dir