A schematic diagram of the Attribute model. The Bi-LSTM nodes here refer to the same LSTM network, passed over each span of tokens individually. Here, t _n and y _n indicate the token embedding and model output for the nth token, respectively, i and j refer to index the start and end tokens for the Entity in question, and A is the Attribute label prediction for that Entity. The h _t−1 notations indicate that it is the hidden state from the final time step that is used as the output from the LSTM nodes.