Redefining Absent Keyphrases and their Effect on Retrieval Effectiveness (2021.naacl-main)
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| Challenge: | Neural keyphrase generation models can output absent keyphrases, which are keyphrase that do not appear in the source text. |
| Approach: | They propose a finer-grained categorization scheme that sheds more light on the impact of absent keyphrases on scientific document retrieval. |
| Outcome: | The proposed model shows that only 20% of the words that make up keyphrases actually serve as document expansion, but this small fraction behind much of the gains observed in retrieval effectiveness. |
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| Challenge: | Existing keyphrase generation approaches synchronously generate present and absent keyphrases without explicitly distinguishing these two categories. |
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