Researchers – University of Copenhagen

The Copenhagen Team Participation in the Check-Worthiness Task of the Competition of Automatic Identification and Verification of Claims in Political Debates of the CLEF-2018 CheckThat! Lab

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Documents

  • paper_81

    Final published version, 404 KB, PDF-document

We predict which claim in a political debate should be prioritized
for fact-checking. A particular challenge is, given a debate, how to
produce a ranked list of its sentences based on their worthiness for fact
checking. We develop a Recurrent Neural Network (RNN) model that
learns a sentence embedding, which is then used to predict the checkworthiness
of a sentence. Our sentence embedding encodes both semantic
and syntactic dependencies using pretrained word2vec word embeddings
as well as part-of-speech tagging and syntactic dependency parsing. This
results in a multi-representation of each word, which we use as input to a
RNN with GRU memory units; the output from each word is aggregated
using attention, followed by a fully connected layer, from which the output
is predicted using a sigmoid function. The overall performance of our
techniques is successful, achieving the overall second best performing run
(MAP: 0.1152) in the competition, as well as the highest overall performance
(MAP: 0.1810) for our contrastive run with a 32% improvement
over the second highest MAP score in the English language category. In
our primary run we combined our sentence embedding with state of the
art check-worthy features, whereas in the contrastive run we considered
our sentence embedding alone
Original languageEnglish
Title of host publicationCLEF 2018 Working Notes
EditorsLinda Cappellato , Nicola Ferro , Jian-Yun Nie, Laure Soulier
Number of pages8
PublisherCEUR-WS.org
Publication date2018
Edition10
Article number81
Publication statusPublished - 2018
Event19th Working Notes of CLEF Conference and Labs of the Evaluation Forum, CLEF 2018 - Avignon, France
Duration: 10 Sep 201814 Sep 2018

Conference

Conference19th Working Notes of CLEF Conference and Labs of the Evaluation Forum, CLEF 2018
LandFrance
ByAvignon
Periode10/09/201814/09/2018
SeriesCEUR Workshop Proceedings
Volume2125
ISSN1613-0073

    Research areas

  • CNN, Fact checking, Political debates, RNN

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