Learning Rich Representation of Keyphrases from Text
This work addresses the need for improved keyphrase extraction and generation in NLP, with potential benefits for tasks like NER and QA, though it is incremental in building on existing pre-training methods.
The paper tackles the problem of learning rich keyphrase representations from text by introducing new pre-training objectives for transformer language models, achieving up to 8.16 F1 point gains in keyphrase extraction and up to 4.33 F1@M point gains in keyphrase generation over state-of-the-art methods.
In this work, we explore how to train task-specific language models aimed towards learning rich representation of keyphrases from text documents. We experiment with different masking strategies for pre-training transformer language models (LMs) in discriminative as well as generative settings. In the discriminative setting, we introduce a new pre-training objective - Keyphrase Boundary Infilling with Replacement (KBIR), showing large gains in performance (upto 8.16 points in F1) over SOTA, when the LM pre-trained using KBIR is fine-tuned for the task of keyphrase extraction. In the generative setting, we introduce a new pre-training setup for BART - KeyBART, that reproduces the keyphrases related to the input text in the CatSeq format, instead of the denoised original input. This also led to gains in performance (upto 4.33 points in F1@M) over SOTA for keyphrase generation. Additionally, we also fine-tune the pre-trained language models on named entity recognition (NER), question answering (QA), relation extraction (RE), abstractive summarization and achieve comparable performance with that of the SOTA, showing that learning rich representation of keyphrases is indeed beneficial for many other fundamental NLP tasks.