code: def unpack_hyperopt_vals(vals):
      
      assert isinstance(vals, dict), "Parameter must be given as dict."
      ret = {}
      for k, v in list(vals.items()):
          try:
              ret[k] = v[0]
          except (TypeError, IndexError):
              ret[k] = v
      return ret
docs: Unpack values from a hyperopt return dictionary where values are wrapped in a list.
      :param vals: dict
      :return: dict
          copy of the dictionary with unpacked values