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Infusing Knowledge from Wikipedia to Enhance Stance Detection

Summary

Stance detection means deciding whether a text supports, opposes, or is neutral toward a given target. It often fails when the text refers to the target only indirectly, because models lack the background knowledge that human readers have. The authors fix this by giving the model the summary of the target's Wikipedia page as extra input. Their model, WS-BERT, has two variants. For formally written documents, WS-BERT-Single packs the text, the target and the Wikipedia summary into one BERT input so all three can attend to each other. For tweets, WS-BERT-Dual encodes the text–target pair with a Twitter-pretrained model (BERTweet or COVID-Twitter-BERT) and encodes the Wikipedia summary separately with BERT-base. It then joins the two [CLS] vectors before a softmax classifier. Across P-Stance, COVID-19-Stance and VAST, the method set new state-of-the-art results in target-specific, cross-target and zero/few-shot settings. The largest gains came when test targets were unseen in training. This suggests that raw encyclopedia text is a cheap, easily updated knowledge source, including for newly emerging targets.

Key points

  • Datasets: P-Stance (tweets about Biden, Sanders, Trump), COVID-19-Stance (four targets, e.g. Anthony Fauci and mask wearing) and VAST (New York Times debate comments, ~6000 targets).
  • For VAST, Wikipedia pages were retrieved automatically with the wikipedia Python API. Roughly 200 targets had no page, so the target string itself served as the knowledge. Summaries were cut to 512 tokens.
  • On COVID-19-Stance, WS-BERT-Dual reached an average macro-F1 of 84.4, compared with 83.0 for the authors' re-implemented COVID-Twitter-BERT.
  • On VAST, WS-BERT-Single scored 75.3 zero-shot, 73.6 few-shot and 74.5 overall. The knowledge-graph model CKE-Net reached 70.1 overall, about the same as a well-tuned plain BERT (70.0).
  • In cross-target transfer on P-Stance, the biggest improvements came from training on Trump and testing on Biden or Sanders. Code and data are released on GitHub (zihaohe123/wiki-enhanced-stance-detection).

Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.

Fields: Linguistics & languages

Cited by

30 papers of our library cite it (of the 140673 whose bibliographies we read); 4 of them have a page here, 26 not yet.

Cite

The paper itself, not this page. BibTeX from the library's record of the work. DOI 10.18653/v1/2022.wassa-1.7 · arXiv 2204.03839

@inproceedings{he2022infusing,
  title = {{Infusing Knowledge from Wikipedia to Enhance Stance Detection}},
  author = {He, Zihao and Mokhberian, Negar and Lerman, Kristina},
  booktitle = {Proceedings of the 12th Workshop on Computational Approaches to Subjectivity, Sentiment \& Social Media Analysis},
  year = {2022},
  doi = {10.18653/v1/2022.wassa-1.7},
  eprint = {2204.03839},
  archivePrefix = {arXiv},
  url = {https://doi.org/10.18653/v1/2022.wassa-1.7}
}

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