docs: def _unpack_list(example):
      """
      Input data format standardization
      """
      try:
          x = example[0]
          y = example[1]
          meta = None
          return x, y, meta
      except IndexError:
          raise IndicoError(
              "Invalid input data.  Please ensure input data is "
              "formatted as a list of `[data, target]` pairs."
          )