code: def _init_subtokens_from_list(self, subtoken_strings):
          
          # we remember the maximum length of any subtoken to avoid having to
          # check arbitrarily long strings.
          self._all_subtoken_strings = set([s for s in subtoken_strings if s])
          self._max_subtoken_len = max([len(s) for s in subtoken_strings])
docs: Initialize token information from a list of subtoken strings.