SIRIUS-LTG: An Entity Linking Approach to Fact Extraction and Verification

Farhad Nooralahzadeh, Lilja Øvrelid


Abstract
This article presents the SIRIUS-LTG system for the Fact Extraction and VERification (FEVER) Shared Task. It consists of three components: 1) Wikipedia Page Retrieval: First we extract the entities in the claim, then we find potential Wikipedia URI candidates for each of the entities using a SPARQL query over DBpedia 2) Sentence selection: We investigate various techniques i.e. Smooth Inverse Frequency (SIF), Word Mover’s Distance (WMD), Soft-Cosine Similarity, Cosine similarity with unigram Term Frequency Inverse Document Frequency (TF-IDF) to rank sentences by their similarity to the claim. 3) Textual Entailment: We compare three models for the task of claim classification. We apply a Decomposable Attention (DA) model (Parikh et al., 2016), a Decomposed Graph Entailment (DGE) model (Khot et al., 2018) and a Gradient-Boosted Decision Trees (TalosTree) model (Sean et al., 2017) for this task. The experiments show that the pipeline with simple Cosine Similarity using TFIDF in sentence selection along with DA model as labelling model achieves the best results on the development set (F1 evidence: 32.17, label accuracy: 59.61 and FEVER score: 0.3778). Furthermore, it obtains 30.19, 48.87 and 36.55 in terms of F1 evidence, label accuracy and FEVER score, respectively, on the test set. Our system ranks 15th among 23 participants in the shared task prior to any human-evaluation of the evidence.
Anthology ID:
W18-5519
Volume:
Proceedings of the First Workshop on Fact Extraction and VERification (FEVER)
Month:
November
Year:
2018
Address:
Brussels, Belgium
Editors:
James Thorne, Andreas Vlachos, Oana Cocarascu, Christos Christodoulopoulos, Arpit Mittal
Venue:
EMNLP
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
119–123
Language:
URL:
https://aclanthology.org/W18-5519
DOI:
10.18653/v1/W18-5519
Bibkey:
Cite (ACL):
Farhad Nooralahzadeh and Lilja Øvrelid. 2018. SIRIUS-LTG: An Entity Linking Approach to Fact Extraction and Verification. In Proceedings of the First Workshop on Fact Extraction and VERification (FEVER), pages 119–123, Brussels, Belgium. Association for Computational Linguistics.
Cite (Informal):
SIRIUS-LTG: An Entity Linking Approach to Fact Extraction and Verification (Nooralahzadeh & Øvrelid, EMNLP 2018)
Copy Citation:
PDF:
https://preview.aclanthology.org/naacl-24-ws-corrections/W18-5519.pdf
Data
FEVER