For each recurrent step t, the hidden states from the last recurrent step are taken to calculate the cell state of the current state.
for node j, the hidden state of the previous step can be divided into the last hidden state h self j from self-to-self channel, the last hidden state h up t−1,j from bottom-up channel and the last hidden state h down t−1,j from the top-down channel: We calculate gate and state values based on the inputs and last hidden states from the three information channels.