DivGraphPointer
Table 5. The Average Index of Coincidence (AIC@N) of the extracted keyphrases from GraphPointer (left) and DivGraphPointer (right) on five benchmarks
['Inspec', '[BOLD] AIC@5 0.057', '[BOLD] AIC@5  [BOLD] 0.034', '[BOLD] AIC@10 0.062', '[BOLD] AIC@10  [BOLD] 0.048']
AIC represents the probability of the identical words appearing in the extracted keyphrases. A smaller AIC indicates smaller redundancy. We can find that our proposed mechanism is very effective in improving keyphrase diversity. We also observe that this effect is more significant for top 5 keyphrases than top 10 keyphrases. It shows that the diversification mechanism tends to take effect at the begin of the keyphrase extraction process.