$$

隐藏输出\mathbf{H}t = \phi(\mathbf{X}*t \mathbf{W}*{xh} + \mathbf{H}{t-1} \mathbf{W}_{hh} + \mathbf{b}_h).
输出
\mathbf{O}_t = \mathbf{H}t \mathbf{W}{hq} + \mathbf{b}_q.
$$