We link these two LSTM layers so that the hidden representations generated by the LSTM B can be fed to LSTM U as the guidance information.
their hidden representations are calculated as follows: The probability scores z B i ∈ R |Y B | over the aspect boundary tags Y B ={B, I, E, S, O} are calculated by a fully-connected softmax layer: Similarly, the scores z U i ∈ R |Y U | over the unified tags Y U defined in Section 2 are obtained as: Before detailing the DMI module, we firstly introduce Global-Local Memory Interaction (GLMI) that describes the interaction between a local memory h i ∈ R dim h and a global memory m ∈ R dim h .