def METHOD_NAME(self, hyps: List[Hypothesis]) -> Tuple[torch.Tensor, None]:
    """One-step forward hypotheses.
    Args:
        hyps: Hypotheses.
    Returns:
        out: Decoder output sequences. (B, D_dec)
        states: Decoder hidden states. None
    """
    labels = torch.tensor(
        [[h.yseq[-1]] for h in hyps], dtype=torch.long, device=self.device
    )
    embed = self.embed(labels)
    return embed.squeeze(1), None