code: def _one_hidden(self, l:int)->Tensor:
          "Return one hidden state."
          nh = (self.n_hid if l != self.n_layers - 1 else self.emb_sz) // self.n_dir
          return one_param(self).new(1, self.bs, nh).zero_(f _one_hidden(self, l:int)->Tensor:
          "Return one hidden state."
          nh = (self.n_hid if l != self.n_layers - 1 else self.emb_sz) // self.n_dir
          return one_param(self).new(1, self.bs, nh).zero_()
docs: Return one hidden state.