The TC-LSTMs model the interactions at position (i, j) by merging the internal memory c i−1,j c i,j−1 and hidden state h i−1,j h i,j−1 along row and column dimensions.
with TC-LSTMs, LC-LSTMs firstly use two standard LSTMs in parallel, producing hidden states h 1 i,j and h 2 i,j along row and column dimensions respectively, which are then merged together flowing next step.