In this approach, we take 2 × 150 dimension BiLSTM hidden states so that h t and g t are aligned in dimensionality.
such an approach yields 73.7%, 70.0%, 78.9% and 71.8% F1 scores on VUA ALL POS, VUA VERB, MOH-X and TroFi datasets, which is worse than the concatenation approach (RNN HG) in Table 2.