Cogito Ergo Summ: Abstractive Summarization of Biomedical Papers via Semantic Parsing Graphs and Consistency Rewards

Authors

  • Giacomo Frisoni University of Bologna, Italy
  • Paolo Italiani University of Bologna, Italy
  • Stefano Salvatori University of Bologna, Italy
  • Gianluca Moro University of Bologna, Italy

DOI:

https://doi.org/10.1609/aaai.v37i11.26503

Keywords:

SNLP: Summarization, APP: Bioinformatics, ML: Deep Neural Architectures, ML: Reinforcement Learning Algorithms, SNLP: Generation, SNLP: Language Grounding, SNLP: Language Models, SNLP: Learning & Optimization for SNLP, SNLP: Lexical & Frame Semantics, Semantic Parsing, SNLP: Sentence-Level Semantics and Textual Inference, KRR: Other Foundations of Knowledge Representation & Reasoning

Abstract

The automatic synthesis of biomedical publications catalyzes a profound research interest elicited by literature congestion. Current sequence-to-sequence models mainly rely on the lexical surface and seldom consider the deep semantic interconnections between the entities mentioned in the source document. Such superficiality translates into fabricated, poorly informative, redundant, and near-extractive summaries that severely restrict their real-world application in biomedicine, where the specialized jargon and the convoluted facts further emphasize task complexity. To fill this gap, we argue that the summarizer should acquire semantic interpretation over input, exploiting structured and unambiguous representations to capture and conserve the most relevant parts of the text content. This paper presents CogitoErgoSumm, the first framework for biomedical abstractive summarization equipping large pre-trained language models with rich semantic graphs. Precisely, we infuse graphs from two complementary semantic parsing techniques with different goals and granularities—Event Extraction and Abstract Meaning Representation, also designing a reward signal to maximize information content preservation through reinforcement learning. Extensive quantitative and qualitative evaluations on the CDSR dataset show that our solution achieves competitive performance according to multiple metrics, despite using 2.5x fewer parameters. Results and ablation studies indicate that our joint text-graph model generates more enlightening, readable, and consistent summaries. Code available at: https://github.com/disi-unibo-nlp/cogito-ergo-summ.

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Published

2023-06-26

How to Cite

Frisoni, G., Italiani, P., Salvatori, S., & Moro, G. (2023). Cogito Ergo Summ: Abstractive Summarization of Biomedical Papers via Semantic Parsing Graphs and Consistency Rewards. Proceedings of the AAAI Conference on Artificial Intelligence, 37(11), 12781-12789. https://doi.org/10.1609/aaai.v37i11.26503

Issue

Section

AAAI Technical Track on Speech & Natural Language Processing