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A more abstractive summarization model

2020-02-25 15:22:23
Satyaki Chakraborty, Xinya Li, Sayak Chakraborty
arXiv_CL
       
Abstract

Pointer-generator network is an extremely popular method of text summarization. More recent works in this domain still build on top of the baseline pointer generator by augmenting a content selection phase, or by decomposing the decoder into a contextual network and a language model. However, all such models that are based on the pointer-generator base architecture cannot generate novel words in the summary and mostly copy words from the source text. In our work, we first thoroughly investigate why the pointer-generator network is unable to generate novel words, and then address that by adding an Out-of-vocabulary (OOV) penalty. This enables us to improve the amount of novelty/abstraction significantly. We use normalized n-gram novelty scores as a metric for determining the level of abstraction. Moreover, we also report rouge scores of our model since most summarization models are evaluated with R-1, R-2, R-L scores.

Abstract (translated)

URL

https://arxiv.org/abs/2002.10959

PDF

https://arxiv.org/pdf/2002.10959.pdf

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