门控循环单元(GRU)H ~ t = tanh ( X t W x h + ( R t ⊙ H t − 1 ) W h h + b h ) , \tilde{\mathbf{H}}_t = \tanh(\mathbf{X}_t \mathbf{W}_{xh} + \left(\mathbf{R}_t \odot \mathbf{H}_{t-1}\right) \mathbf{W}_{hh} + \mathbf{b}_h), H~t=tanh(XtWxh+(Rt⊙Ht−1)Whh+bh), 要是没有 R t R_t Rt 的