DivGraphPointer
Table 6. The performance of DivGraphPointer w.r.t. the length penalty factor α.
['[EMPTY]', '[BOLD] Inspec  [BOLD] F1@5', '[BOLD] Inspec  [BOLD] F1@10', '[BOLD] Krapivin  [BOLD] F1@5', '[BOLD] Krapivin  [BOLD] F1@10']
Length Penalty Factor Fianlly, we investigate how the length penalty factor α affects the performance of the DivGraphPointer. Results show that the length penalty factors affect the model performance significantly. Either a small value of α (e.g., α=0), which tends to generate long phrase, or a big value of α (e.g., α=100), which tends to generate short phrases, yields inferior results. The best choice of α is between 0 and 1 for Inspec and between 1 and 5 for Krapivin, which indicates that both extreme cases - totally normalization α=0 or no normalization α=100 - are not good choices.